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Mineral composition of raw material, substrate and fruiting bodies of Pleurotus ostreatus in culture/Composicion mineral de la materia prima, el substrato y los cuerpos de fructuficacion de Pleurotus ostreatus/Composicao mineral da materia prima, do substrato e dos corpos de frutificacao de Pleurotus ostreatus.

Introduction

The cultivation of edible mushrooms has evolved in time and has become nowadays an activity of economical importance, mainly for the production of species of the genera Agaricus, Pleurotus and Lentinula. Their world production increase, especially Pleurotus spp., particularly occurred due to their ability to grow in different residues, such as sawdust and agroindustrial waste, a characteristic that made production economically viable. Such characteristics are relevant regards production, but mushrooms are also important regarding their nutritional aspect.

The type of substrate, the environmental conditions and the fungus species used in cultivation all have a large influence in the chemical composition of fruiting bodies. Variations occur mainly in relation to minerals and protein contents (Crisan and Sands, 1978).

There are few studies about the mineral composition of cultivated mushrooms (Strmiskova et al., 1992; Vetter, 1994; Sturion and Ranzani, 2000). The adaptation of Pleurotus spp. strains to new residues requires knowledge of the cultivation process and the chemical composition of both substrate and fruiting body, more so as new formulations with wood and agroindustrial waste from the Amazon region are considered.

In general, the mineral elements necessary for the fruiting of the mushroom are the same required by any other cultivated plant, macro and micronutrients (Molena, 1986). P, K, Mg and S are the necessary macronutrients for the growth of several fungi (Miles and Chang, 1997). Molena (1986) included Ca as one of these elements. Kurtman and Zadrazil (1984) reported that minerals such as Na, Mg and Ca chlorides, stimulate mycelium growth, as well as the beginning of fruiting body formation.

Ca is a needed mineral for plants, but not so for most fungi, except for some ascomycetes in the formation of the perithecium and for certain basidiomycetes, such as Cyathus stercoreus, in the formation of the basidioma (Chang and Miles, 1989). According to Przybylowicz and Donoghue (1990), other supplements like limestone or CAC[O.sub.3], must be added to the cultivation medium to maintain a pH favorable to fungus growth during the last stages of decomposition, avoiding the increase in acidity caused by fungal metabolism.

K is available for the fungus usually in the form of phosphate (0.0001-0.0004M), thus providing two essential minerals for its metabolism (Chang and Miles, 1989). This mineral is very important because it is a co-factor of several enzymatic systems, being the most abundant macroelement in mushrooms (Chang et al., 1981; Chang and Miles, 1989; Vetter, 1990, 1994; Strmiskova et al., 1992; Miles and Chang, 1997; Sturion and Ranzani, 2000; Wang et al., 2001; Zhang and Fadel, 2002).

Fe, Zn, Al, Mn, Cu, Cr and Mo are among the most studied and most essential micronutrients (trace elements) for the growth of many species of fungi (Molena, 1986; Miles and Chang, 1997). Some chemical elements that have been detected in the constitution of fungi, however, do not necessarily indicate any biological importance. It is hard to experimentally determine the necessary amount of these elements because the tested element may be present in sufficient amounts, in impure form, in some ingredient of the growth medium or may be introduced by means of the inoculum. These elements are constituents or activators of several enzymes (Miles and Chang, 1997).

The content of mineral components of wood such as Ca, Mg, P, Si, K and others is normally low, and made up mainly of oxides. The ash content of wood is also considered low, varying between 0.2 and 1% dry weight (Browing, 1963).

The present study aims to analyze minerals from new substrates and from the fungus in relation to new growth substrates, so as to know the chemical composition of alternative substrates formulated with wood and agroindustrial wastes found in Amazon for the cultivation of Pleurotus, as well as the chemical composition of this strain in relation to the substrate on which it is grown, in order to better manage cultivation for future application in the growth of edible mushrooms in the region.

Materials and Methods

Samples

Samples were divided into raw material (analyzed separately), substrates (initial and spent) and the fruiting bodies harvested on the different substrates, described as follows:

Raw material: rice bran (RB); wheat bran (WB); corn bran (CB); bran mixture (BM) in the proportion of 60:20:20% for the respective brans; Simarouba amara Aubl. ("marupa") sawdust (MS); Ochroma piramidale Cav. ex. Lam. ("pau de balsa") sawdust (PB); ground stems of Bactris gasipaes Kunth ("pupunheira") palm tree (PP); and Saccharum officinarum (sugar cane) bagasse (SC).

Initial substrate, sterilized in autoclave previous to use, made up with the mixture of each sawdust or bagasse + brans mixture (BM). The codification employed for the initial autoclaved substrates (ISA) was ISAMP for ISA from "marupa" sawdust, ISAPB for ISA from "pau de balsa" sawdust, ISAPP from waste of the crushed stipe of "pupunheira", and ISASC from sugar cane bagasse.

Spent substrate (SS), resulting from the final process of the cultivation of Pleurotus ostreatus on the respective substrates mentioned above, codified as SSMP, SSPB, SSPP and SSSC.

Fruiting bodies, harvested on the respective initial substrates: ISAMP-MUSH, ISAPB-MUSH, ISAPP-MUSH and ISASC-MUSH.

Determination of macro and micronutrients

The analyses of macronutrients (Ca, Mg, P and K) and micronutrients (Na, Fe, Cu, Mn and Zn) were carried out in triplicate, following the same protocol used for the analysis of soil and plants (Malavolta et al., 1989) in order to verify the presence of mineral compounds. Samples were dried and finely crushed in a Willey knife mill at the Department of Forest Products of the National Institute for Amazonian Research, for further digestion and analyses at the Laboratory of Soils and Plants Analysis of the same institute and of the Analysis Center of the Federal University of Amazonas.

Samples were weighed (0,5g), digested with nitricperhydrol acid mixture and solubilized. Ca, Mg, Fe, Cu, Mn and Zn contents were determined by means of atomic absorption spectrophotometry, Na and K by atomic emission, and P by UV-visible colorimetry, all previously calibrated with standard solutions for each element (AOAC, 1997). Macronutrients (Ca, P, Mg and K) values were calculated in g*[kg.sup.-1] and micronutrients (Na, Fe, Cu, Mn and Zn), in mg*[kg.sup.-1].

Results and Discussion

According to Kurtzman and Zadrazil (1982), P. K, Fe and Mg are the most important minerals for the cultivation of Pleurotus. As confirmed in this study, they are naturally present in all of the raw materials used in the preparation of the cultivation substrate (Table I). Fe, Zn, Mn, Cu, Cr and Mo are among the essential and most studied microelements (trace elements) for the growth of many species (Molena, 1986; Miles and Chang, 1997).

The results related to macro and micro minerals analyzed in the different substrates, moistened and sterilized, are presented in Table II. These minerals were present in the raw material, as well as in all substrates tested, with higher amounts in the substrate formulated from residues of Bactris gasipaes Kunth (ISAPP), in agreement with the above authors. Cr, Mo and S were not analyzed in the present study.

The amount of macronutrients present in the initial substrates analyzed (Table II) followed the order Ca>K>P>Mg, while micronutrients followed the order Na>Fe (except for ISAPP and ISASC, in which Fe was higher than Na) >Mn>Zn>Cu. The presence of these minerals in the substrates tested reveal their importance for mushroom cultivation (Kurtzman and Zadrazil, 1982; Molena, 1986; Chang and Miles, 1989; Miles and Chang, 1997).

The results of macro and micro minerals present in post-harvest or spent substrates (SS) are presented in Table III. Their concentrations follow the orders Ca>P>K>Mg for macro and Zn>Fe>Mn>Na>Cu micronutrients. These spent substrates underwent modifications in its composition, resulting in a different substrate composition from that of the initial one. According to Oliveira (2000) the degradation level varies with the genetic composition of the Pleurotus species used, besides physical, environmental, chemical and biological factors.

According to Rajarathmam and Bano (1989), cited by Sturion (1994), the reduction in the organic matter of the substrate is due to C[O.sub.2] and [H.sub.2]O losses during the metabolism of the fungus, and also because of the removal of substances from the substrate for the construction of the fruit body. These losses are usually higher during the fruiting process than during mycelium development. The amino acidic nitrogen tends to increase due to the proteases activity justified by the loss of C[O.sub.2], as well as a progressive decrease of phenolic compounds if the incubation period is longer, due to the activity of the oxidant enzymes, secreted by Pleurotus, which degrade phenols (Rajarathmam and Bano, 1989).

Comparing data from Tables II and III the increased mineral composition of SS in relation to the of the initial substrate can be noticed for most elements, except for K, whose values were lower in all spent substrates, as well as P values of spent substrates SSMP and SSPB, which presented lower values than the initial substrate. Among micronutrients, Cu in SSPP and SSSC also revealed lower values than their respective ISA, before being decomposed by the fungus.

The relative increase of the mineral content in spent substrates was also verified in other studies (Zadrazil, 1978; Sturion, 1994; Oliveira, 2000; Silva et al., 2002), resulting from the cultivation of different Pleurotus strains in several agricultural residues. Ca was the element in the highest amount in SS, both in this study (Table III) and the cited ones.

Zadrazil (1978) analyzed minerals in the different development stages of P. ostreatus and author reports an increase of minerals (N, P, K, Ca and Mg) and ash contents in the substrate until the stage preceding fruiting (vegetative phase, in which the mycelium of the fungus stores nutrients for the fruiting body formation), followed by a slight decrease in N, K and P, showing a selective removal of nutrients towards the basidioma in the process of fruiting body formation. In spite of this, SS presented an increase of minerals contents in relation to ISA. The author mentions that the SS, rich in nutrients, presented high digestibility due to cellulose and lignin degradation, with increased solubility, consequently offering higher content of free sugars (glucose), which makes it useful as basis for the champignon compost, organic fertilizer and animal feed.

Rajarathnam and Bano (1992), studying basidiomycetes potentiality, report the increase of ash contents in SS, as a result of the constant use of organic matter by the fungus, from the incubation stage (vegetative growth) to the end of cultivation, making minerals release for the final substrate possible.

In the present work, although minerals have not been analyzed in the different growth stages of the fungus, a remarkable increase in their contents was found in the substrate decomposed by the fungus (SS). This characteristic is useful for the animal feed industry and for the formulation of organic fertilizers. There is abundant literature concerning the use of spent substrate resulting from the culture of Pleurotus as fertilizer for the production of vegetables (Maher, 1991), ingredient for animal food (Albores et al., 2006) and cultivation substrate for other species of fungi (Silva et al., 2002).

Concerning the increase of minerals and ash contents in SS, it is relevant to emphasize the importance of additional studies to verify the causes of such high con tents, much higher to the ones found in the initial substrate.

Table IV shows the mineral content in P. ostreatus fruiting bodies grown in the different substrates, characterizing P. ostreatus as a source of minerals, in accordance with Chang and Miles (1989), Miles and Chang (1997), Vetter (1990, 1994), Sturion and Ranzani (2000), Zhang and Fadel (2002) and Bernas et al. (2006).

Mushrooms are an important source of minerals which are removed from the substrate by the mycelium, being supplied during mycelium growth of the fungus and translocated to the fruit body during its formation process (Chang and Miles, 1989).

The mineral constituents of mushrooms are basically the same of superior plants. As in those plants, K is the most abundant mineral, followed by P and Mg, confirming literature data (Chang et al., 1981; Chang and Miles, 1989; Strmiskova et al., 1992; Vetter, 1990, 1994; Sturion, 1994; Sturion and Oetterer, 1995; Miles and Chang, 1997; Sturion and Ranzani, 2000; Wang et al., 2001; Bernas et al., 2006). This finding is confirmed in Table IV, where K is the most abundant macronutrient in all the substrates tested, varying from 36.83 to 42.18g*[kg.sup.-1], followed by P (6.95-10.60), Mg (1.57-2.50) and Ca (0.34-0.60).

In the present work, K, P and Mg values of mushrooms cultivated in the several residues are superior to the ones presented by Vetter (1990) by and Sturion (1994), where the authors grew several strains of Pleurotus in different agricultural residues, as well as the results for K and Mg reported by Chang et al. (1981) and Vetter (1994), and the research conducted by Stunon and Ranzani (2000), in which the authors analyzed several commercial strains of Pleurotus grown in Brazil and, finally, the results reported by Wang et al. (2001) when they grew P. ostreatus in barley residue.

According to Li and Chang (1982), cited by Chang and Miles (1989), the K, P, Na, Ca and Mg contents of the fruiting body are responsible for 56-70% of its total ash contents, where K represents ~45%, which shows the abundance of this mineral in the mushroom. In the present study, K, P and Mg were found in higher amounts in the mushrooms than in the initial substrate, except for the Mg found in fruiting body harvested on Bactris gasipaes Kunth (PP) residue substrate, as can be seen comparing Tables II and IV. The same was verified by Bano and Rajarathnam (1988) for P, when they grew different species of Pleurotus in rice straw. P and K contents were also higher in the mushrooms than in the substrate in the works carried out by Zhang and Fadel (2002) when they grew Pleurotus sajor-caju in rice and wheat straw. Similar results were obtained with Mg and K by Sapata (2005).

The K translocation process in the basidioma appears to be very efficient, because the higher its content in the mushroom (Table IV), the lower its content in the corresponding spent substrate (Table III).

The Ca amount found corresponds to the lowest concentration in the present study (0.34-0.60g*[kg.suup.-1]), in agreement with published results, except for Pleurotus tuber-regium (Akindahunsi and Oyetayo, 2006), where Ca content is higher than that of P.

Among micro minerals present in the mushrooms grown in the several substrates analyzed, Na was the one with the highest content in all substrates tested, varying from 154.00 to 194.40mg*[kg.suup.-1], followed by Fe (115.67-151.00mg*[kg.suup.-1]), Zn (64.67-82.00), Mn (16.00-23.00) and Cu (9.10-11.69). Although Na presents the highest value among micro minerals, it is considered low concerning human diet, according to Sturion and Ranzani (2000). This fact makes this mushroom of interest in the treatment of patients with hypertension, added to the fact that it is rich in K.

For the same minerals analyzed, Strimiskova et al. (1992) obtained the following values (mg*[kg.sup.-1]) and order: Na (195.0) >Fe (90.3) >Zn (67.6) >Cu (15.1) >Mn (7.4). The order was basically the same as that in the present study, except for Mn, which was lower than Cu.

The chemical composition of the mushrooms varied according to the substrate in which it was grown, as was also detected in former studies (Chang et al., 1981; Sturion, 1994; Silva et al., 2002).

Conclusions

--There was an increase of mineral content in the substrate decomposed by the fungus (spent substrate, SS), as a result of the use of organic matter by the fungus from the incubation stage (vegetative growth) to the end of cultivation allowing the release of minerals.

--The highest content found in all substrates tested (ISAMP, ISAPB, ISAPP and ISASC) was that of K, varying from 36.83 to 42.18g*[kg.sup.-1] and followed by P (6.95-10.60) and Mg (1.57-2.50).

--The mineral composition of the mushrooms varied with the substrate.

--The different substrates used in the present study produced mushrooms rich in K, P, Mg and Fe, important to human nutrition and health.

Received: 08/04/2008. Modified: 06/08/2009. Accepted: 06/09/2009.

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Nature and Cultivation Methods. Chinese University Press. Hong Kong, China. pp.299-348.

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Malavolta E, Vitti GC, Oliveira AS (1989) Avaliacao do Estado Nutricional das Plantas: Principios e Aplicacoes. Nagy. Piracicaba, Brazil. 201 pp.

Maziero R (1990) Substratos Alternativos para o Cultivo de Pleurotus spp. Thesis. Universidade do Estado de Sao Paulo, Brazil 36 pp.

Miles PG, Chang ST (1997) Mushrooms Biology: Concise Basics and Current Developments. Word Scientific. Singapore. 194 pp.

Moda EM, Horii J, Spoto MHF (2005) Edible mushrooms Pleurotus sajor-caju production on washed and supplemented sugar cane bagasse. Sci. Agric. 62: 127-132.

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Oliveira HCB (2000) Avaliacao de Tres Substratos com Diferentes Granulometricas, para o Cultivo de Duas Linhagens de Pleurotus ostreatus (Jacq.:Fr.) Kummer. 89p. Thesis. Universidade Federal do Ceara, Brazil.

Przybylowicz P, Donoghue J (1990) Shiitake Grower's Handbook: The Art and Science of Mushroom Cultivation. Kendall/ Hunt. Dubuque, IA, USA. 217 PP.

Rajarathnam S, Bano, Z (1992) Biopotentialities of basidiomacromycetes. Eur. J. Appl. Microbiol. Biotechnol. 37: 233-361. Sapata MRL (2005) Valorizacao de

Residuos Agricolas: Producao de Cogumelos do Genero Pleurotus. Final Project Report. Instituto Nacional de Investigacao Agraria e das Pescas.

Oeiras, Brazil. 32 pp. Silva SO, Costa SMG, Clemente E (2002) Chemical composition of Pleurotus pulmonarius (Fr.) Quel., substrates and residue after cultivation. Braz. Arch. Biol. Technol. 45: 531-535.

Strmiskova G, Strmiska F, Dubravicky J (1992) Mineral composition of oyester mushrooms. Nahrung 36: 210-212.

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Ceci Sales-Campos. Ph.D., Instituto Nacional de Pesquisas da Amazonia (INPA), Brazil. Researcher, INPA, Brazil. e-mail: ceci@inpa.gov.br

Augusto Ferreira da Eira. Ph.D., Universidade Estadual Paulista (UNESP), Brazil. Professor, UNESE Brazil. e-mail: augustoeira@fungibras.com.br

Marli Teixeira de Almeida Minhoni. Ph.D., UNESE Bmzil. Professor, UNESP, Brazil. e-mail: marliminhoni@fca.unesp.br

Meire Cristina Nogueira de Andrade. Ph.D., INPA, Brazil. Researcher, INPA, Brazil. Address: Laboratorio de Cultivo de Fungos Comestiveis, CPPF/ INPA. Av. Andre Araujo, 2936, Aleixo. Caixa

Postal 478. CEP 69060-001. Manaus, AM, Brazil. e-mail: mcnandrade@hotmail.com
TABLE I
MINERAL COMPOSITION OF THE RAW MATERIAL ANALYZED

Raw                    Macronutrients
material           Ca                   Mg
                                   g *[kg.sup.1]

RB         0.63 [+ or -] 0.09   7.02 [+ or -] 0.50
WB         1.03 [+ or -] 0.03   4.01 [+ or -] 0.08
CB         0.93 [+ or -] 1.38   1.17 [+ or -] 0.15
BM         0.52 [+ or -] 0.20   6.09 [+ or -] 0.08
MS         2.75 [+ or -] 0.21   0.24 [+ or -] 0.00
PBS        5.50 [+ or -] 2.26   0.81 [+ or -] 0.01
PP         2.97 [+ or -] 0.64   1.25 [+ or -] 0.01
SC         0.63 [+ or -] 0.04   0.07 [+ or -] 0.01

Raw                       Micronutrients
material             P                    K
             g *[kg.sup.1]

RB         22.55 [+ or -] 0.11   19.41 [+ or -] 2.33
WB         11.72 [+ or -] 0.11   10.63 [+ or -] 0.18
CB          2.70 [+ or -] 0.01    3.60 [+ or -] 0.35
BM          9.71 [+ or -] 0.22   15.01 [+ or -] 0.36
MS          0.52 [+ or -] 0.01    1.06 [+ or -] 0.05
PBS         0.51 [+ or -] 0.04    2.40 [+ or -] 0.09
PP          3.27 [+ or -] 0.01    9.77 [+ or -] 0.09
SC          2.87 [+ or -] 0.03    1.88 [+ or -] 0.07

Raw                       Macronutrients
material            Na                       Fe

RB         270.00 [+ or -] 14.14    98.00 [+ or -] 1.73
WB         380.00 [+ or -] 14.14   146.00 [+ or -] 4.36
CB         300.00 [+ or -] 0.00      33.6 [+ or -] 1.53
BM         305.00 [+ or -] 5.23     98.33 [+ or -] 0.58
MS         400.00 [+ or -] 0.00     75.33 [+ or -] 2.52
PBS        403.33 [+ or -] 5.77     47.33 [+ or -] 1.15
PP         290.00 [+ or -] 0.00     63.67 [+ or -] 3.21
SC         515.00 [+ or -] 1.21     35.33 [+ or -] 0.58

Raw                       Macronutrients
material            Zn                     Mn
             mg * [kg.sup.-1]

RB          77.67 [+ or -] 1.53   212.33 [+ or -] 0.58
WB         109.67 [+ or -] 0.58   151.33 [+ or -] 0.58
CB          32.33 [+ or -] 1.15     6.33 [+ or -] 0.58
BM          91.00 [+ or -] 0.00   192.33 [+ or -] 0.58
MS          11.67 [+ or -] 0.58     6.00 [+ or -] 0.00
PBS         22.33 [+ or -] 1.15     5.33 [+ or -] 0.58
PP          97.33 [+ or -] 1.15     5.33 [+ or -] 0.58
SC          11.33 [+ or -] 0.58     7.33 [+ or -] 0.58

Raw           Macronutrients
material            Cu

RB          8.00 [+ or -] 0.00
WB         13.33 [+ or -] 1.53
CB          3.00 [+ or -] 1.00
BM          8.33 [+ or -] 0.58
MS          7.00 [+ or -] 0.00
PBS         9.00 [+ or -] 0.00
PP         12.00 [+ or -] 0.00
SC          5.00 [+ or -] 0.00

All values are mean ([+ or -] SD) of three replicates.
RB: rice bran. WB: wheat bran, CB: corn bran, BM: bran mixture,
MS: "marupa" (Simarouba amara Aubl.) sawdust, PBS: "pau de balsa"
(Ochroma piramidale Cav. ex. Lam.) sawdust, PP: ground "pupunha"
(Bactris gasipaes Kunth), SC: sugar cane (Saccharum officinarum)
bagasse.

TABLE II
MINERAL COMPOSITION OF INITIAL SUBSTRATES STERILIZED IN AUTOCLAVE (ISA)

Sterilized                      Macronutrients
initialsubstrate            Ca                   Mg
                                           g * [kg.sup.-1]

ISAMP               9.79 [+ or -] 0.77   1.49 [+ or -] 0.13
ISAPB              10.27 [+ or -] 0.61   1.75 [+ or -] 0.12
ISAPP               36.8 [+ or -] 2.22   2.38 [+ or -] 0.11
ISASC               8.42 [+ or -] 0.02   1.49 [+ or -] 0.01

Sterilized                      Macronutrients
initialsubstrate           P                    K
                    g * [kg.sup.-1]
ISAMP              3.78 [+ or -] 0.00   3.67 [+ or -] 0.10
ISAPB              3.78 [+ or -] 0.01   7.92 [+ or -] 0.32
ISAPP              7.18 [+ or -] 0.17   8.55 [+ or -] 0.44
ISASC              3.55 [+ or -] 0.01   3.35 [+ or -] 0.03

Sterilized                    Micronutrients
initialsubstrate            Na                     Fe

ISAMP              67.03 [+ or -] 0.10    64.00 [+ or -] 1.00
ISAPB              66.83 [+ or -] 0.16    61.66 [+ or -] 1.53
ISAPP              66.85 [+ or -] 0.27   104.33 [+ or -] 1.15
ISASC              41.15 [+ or -] 1.37    67.67 [+ or -] 0.58

Sterilized                      Micronutrients
initialsubstrate            Zn                    Mn
                     g * [kg.sup.-1]
ISAMP              21.33 [+ or -] 4.51   34.67 [+ or -] 0.58
ISAPB              29.33 [+ or -] 6.66   35.00 [+ or -] 1.00
ISAPP              82.00 [+ or -] 1.00   40.00 [+ or -] 0.00
ISASC              32.00 [+ or -] 2.00   37.33 [+ or -] 1.53

Sterilized           Micronutrients
initialsubstrate           Cu

ISAMP              3.49 [+ or -] 0.39
ISAPB              5.02 [+ or -] 0.06
ISAPP              9.35 [+ or -] 0.04
ISASC              9.94 [+ or -] 0.98

All values are mean ([+ or -] SD) of three repetitions per substrate
in relation to each mineral. ISAMP: initial substrate formulated from
"marupa" (Simarouba amara Aubl.) sawdust, ISAPB: initial substrate
formulated from "pau de balsa" (Ochroma piramidale Cav. ex. Lam.)
sawdust, ISAPP: initial substrate formulated from grinded stipe of the
"pupunheira" (Bactris gasipaes Kunth), ISASC: initial substrate
formulated from sugar cane (Saccharum officinarum) bagasse.

TABLE III
MINERAL COMPOSITION OF SPENT SUBSTRATES: POST-HARVEST (SS)

Spent substrate                 Macronutrients
(post-harvest)             Ca                   Mg
                                         g * [kg.sup.-1]
SSMP              24.66 [+ or -] 0.02   2.65 [+ or -] 0.03
SSPB              26.35 [+ or -] 0.15   3.44 [+ or -] 0.02
SSPP              39.94 [+ or -] 0.03   3.51 [+ or -] 0.01
SSSC              25.14 [+ or -] 0.02   2.47 [+ or -] 0.03

Spent substrate                 Macronutrients
(post-harvest)            P                    K
                    g * [kg.sup.-1]
SSMP              3.63 [+ or -] 0.01   2.90 [+ or -] 0.02
SSPB              3.70 [+ or -] 0.01   4.47 [+ or -] 0.03
SSPP              7.36 [+ or -] 0.11   6.21 [+ or -] 0.01
SSSC              3.80 [+ or -] 0.01   2.31 [+ or -] 0.01

Spent substrate                 Macronutrients
(post-harvest)              Na                     Fe

SSMP               79.34 [+ or -] 9.43   213.33 [+ or -] 1.53
SSPB               98.33 [+ or -] 4.78   312.67 [+ or -] 2.08
SSPP              112.70 [+ or -] 0.10   217.00 [+ or -] 1.00
SSSC              121.03 [+ or -] 0.42   178.00 [+ or -] 1.00

Spent substrate                 Macronutrients
(post-harvest)              Zn                      Mn
                    mg * [kg.sup.-1]
SSMP              426.33 [+ or -] 0.58    123.00 [+ or -] 1.00
SSPB              480.00 [+ or -] 0.00   1117.67 [+ or -] 1.53
SSPP              427.00 [+ or -] 1.00    112.00 [+ or -] 1.00
SSSC              355.00 [+ or -] 1.00    125.67 [+ or -] 1.53

Spent substrate      Macronutrients
(post-harvest)             Cu

SSMP               8.20 [+ or -] 0.52
SSPB               7.43 [+ or -] 0.27
SSPP               7.48 [+ or -] 0.59
SSSC              40.46 [+ or -] 0.43

Mineral composition of spent substrates: post-harvest (SS)
All values are mean ([+ or -] SD) of three repetitions per substrate in
relation to each mineral. SSMP: spent substrate originating from
"marupa" sawdust, SSPB: spent substrate originating from "pau de balsa"
sawdust, SSPP: spent substrate originating from grinded stipe of the
"pupunheira", SSSC: spent substrate originating from sugar cane
bagasse.

TABLE IV
MINERAL COMPOSITION OF Pleurotus ostreatus MUSHROOM GROWN IN THE
DIFFERENT SUBSTRATES

Mushroom                       Macronutrients
per substrate           Ca                   Mg
                                       g * [kg.sup.-1]
ISAMP-MUSH      0,47 [+ or -] 0.06   2.50 [+ or -] 0.02
ISAPB-MUSH      0.34 [+ or -] 0.01   2.12 [+ or -] 0.02
ISAPP-MUSH      0.57 [+ or -] 0.04   1.57 [+ or -] 0.01
ISASC-MUSH      0.60 [+ or -] 0.03   2.12 [+ or -] 0.02

Mushroom                       Macronutrients
per substrate            P                     K
                  g * [kg.sup.-1]
ISAMP-MUSH       7.40 [+ or -] 0.17   39.68 [+ or -] 0.66
ISAPB-MUSH      10.60 [+ or -] 0.22   36.83 [+ or -] 1.01
ISAPP-MUSH       9.74 [+ or -] 0.13   42.18 [+ or -] 0.43
ISASC-MUSH       6.95 [+ or -] 0.28   41.52 [+ or -] 0.74

Mushroom                       Macronutrients
per substrate            Na                      Fe

ISAMP-MUSH      154.00 [+ or -] 16.97   151.00 [+ or -] 1.73
ISAPB-MUSH      172.67 [+ or -] 5.40    131.33 [+ or -] 1.15
ISAPP-MUSH      181.90 [+ or -] 2.12    115.67 [+ or -] 1.15
ISASC-MUSH      194.40 [+ or -] 8.20    123.00 [+ or -] 1.00

Mushroom                       Macronutrients
per substrate             Zn                    Mn
                    mg.[kg.sup.-1]
ISAMP-MUSH      118.00 [+ or -] 1.00   23.00 [+ or -] 1.00
ISAPB-MUSH      124.00 [+ or -] 1.00   20.33 [+ or -] 0.58
ISAPP-MUSH       82.00 [+ or -] 2.65   16.00 [+ or -] 0.00
ISASC-MUSH       96.00 [+ or -] 1.00   20.67 [+ or -] 0.58

Mushroom          Macronutrients
per substrate            Cu
                   mg.[kg.sup.-1]
ISAMP-MUSH      11.69 [+ or -] 0.05
ISAPB-MUSH      10.40 [+ or -] 0.32
ISAPP-MUSH       9.10 [+ or -] 0.31
ISASC-MUSH      10.39 [+ or -] 0.27

All values are mean ([+ or -] SD) of three repetitions per substrate in
relation to each mineral. ISAMP-MUSH: mushroom grown in substrate
originating from "marupa" sawdust, ISAPB-MUSH: mushroom grown in
substrate originating from "pau de balsa" sawdust, ISAPP-MUSH: mushroom
grown in substrate originating from grinded stipe of the "pupunheira"
ISASC-MUSH: mushroom grown in substrate originating from sugar cane
bagasse.
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Author:Sales-Campos, Ceci; da Eira, Augusto Ferreira; Minhoni, Marli Teixeira de Almeida; de Andrade, Meire
Publication:Interciencia
Date:Jun 1, 2009
Words:4935
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