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Chemical-bromatological characteristics of forage sorghum varieties irrigated with saline effluents from fish farming.

Introduction

Forage availability in Brazil is irregular throughout the year due to climatic conditions, with alternating periods of pasture surplus and shortage. This situation is even worse in the Brazilian Semiarid region, where water resources are scarce and do not meet the needs of human consumption and agricultural activities, and part of the groundwater and surface water sources present high salt contents (Vieira et al., 2005).

Saline waters taken from wells are commonly used for fish farming, whose management methods have generated saline effluents, which are little studied. Due to the water scarcity in this region, these effluents can be used for irrigation of plants that are tolerant to salinity.

The use of these saline water requires the application of irrigation water depths that leach part of the salts through the soil. It is essential to reduce soil salinity in the root system area of the plant and ensure the crop productivity. Thus, an ideal water depth that meets the needs of the plant and removes the excess of harmful salts, without causing a nutritional deficiency that damages the crop, must be defined (Araguesa et al., 2014).

Forage sorghum ( Sorghum bicolor (L.) Moench) presents high energy value for animal feed and is highly adapted to dry and hot environments, which limits the growing of other forage species (Buso et al., 2011). It presents high biomass yields per unit area and has been adapted to the silage process (Neumann et al., 2002), thus, it is an alternative for fodder in these environments.

The genetic variability of this crop allowed the development of several breeding programs that generated high number of hybrids and varieties. These materials have different agronomic characteristics and nutritive values, with consequent variations in productivity and morphology, resulting in forages of different qualities. The chemical-bromatological characteristics of sorghum plants can be affected by several factors besides the genetic material, including the cultivation site (Albuquerque et al., 2013) fertilization (Santos et al., 2014b), and water availability (Tardin et al., 2013) and salinity (Guimaraes et al., 2016).

In this context, the objective of this work was to evaluate the chemical and bromatological characteristics of forage sorghum varieties subjected to different leaching fractions of saline effluents from fish farming in the Semiarid region of Brazil.

Material and methods

The experiment was conducted in 2013 at the Caatinga Experimental Field of the Embrapa Semiarid, in Petrolina PE, Brazil (9[degrees]8'8.9"S, 40[degrees]18'33.6"W, and altitude 373 m). The climate of this region is BSwh', semiarid, according to the Koppen classification. The average air relative humidity in the study period was 63.86% and the average temperature was 25.46 [degrees]C, with maximum evapotranspiration of 6.97 mm day (1), and average evapotranspiration of 5.85 mm day (1). The small precipitation events occurred in the study period were concentrated in the first 10 days after planting (DAP) and at 74 DAP, totaling 32.7 mm in the crop cycle.

The soil of the experimental area was classified as Red-Yellow Argissolo (EMBRAPA, 2006) (Ultisol) of medium texture and presented flat relief. It was prepared according to the needs of the crop, with plowing and harrowing, and fertilized with 30 kg [ha.sup.-1] of nitrogen, 60 kg [ha.sup.-1] of phosphorus and 20 kg ha- of potassium based on a previous soil analysis, which showed electrical conductivity of 1.81 dS [m.sup.-1], pH of 5.6, 1.4 [cmol.sub.c] [dm.sup.-3] of Mg, 2.35 [cmol.sub.c] [dm.sup.-3] of Ca, 2.4 cmol [dm.sup.-3] of H + Al, 0.6 [cmol.sub.c] [dm.sup.-3] of K, 0.72 [cmol.sub.c] [dm.sup.-3] of Na, 75.9% of sand, and 14.9% of silt. Nitrogen fertilizer (30 kg [ha.sup.-1]) was applied at 30 DAP, according to the recommendations for the crop for the state of Pernambuco, Brazil (Cavalcanti, 2008). Sowing was carried out in April 2013, and the seedling emergence occurred at 7 DAP.

The experiment was conducted in a randomized block design, in a 3x4 factorial arrangement with four replications, consisting of three forage sorghum varieties (Volumax, F305, and Sudao) and four leaching fractions (0%, 5%, 10%, and 15%) of saline (electrical conductivity of 2.5 dS [m.sup.-1]) effluent from fish farming. The experimental unit consisted of five 5-meter rows of plants with 10 plants per meter and spacing of 0.5 m apart, and the evaluation area consisted of the 3 central meters of the three central rows (12.5 [m.sup.2]).

The plants were irrigated daily using a surface drip irrigation system connected to fish tanks containing black tilapia at density of 40 fish per cubic meter. Fifty percent of the water of the fish tanks was pumped daily into storage tanks to be used for irrigation, and then the fish tanks were replenished. The electrical conductivity of the fish effluent was monitored weekly using a portable digital conductivity meter; it remained at approximately 2.57 dS [m.sup.-1].

The chemical characteristics of the irrigation water from the fish farming were determined weekly, before and during the experiment (Table 1).

The irrigation water depths were calculated according to the crop evapotranspiration (ETo * Kc) in the period between irrigations, considering the water application efficiency of the irrigation system (0.9). The Kc used followed the recommendation of Allen et al. (2006). The cultural practices consisted of manual weeding at 30 DAP, and preventive insecticide application at 40 and 60 DAP.

The plants were harvested in July when the grains were at the farinaceous stage, 92 DAP. The plants of the evaluation area of the plots were cut at a height of 10 cm from the ground, separated into panicle, leaves, and stem, and weighed separately. Subsamples of each plant component were dried at 65 [degrees]C until constant weight to estimate their dry matter content and calculate their proportions.

The organic matter, dry matter, mineral matter, crude protein, neutral detergent fiber (NDF), acid detergent fiber (ADF), and lignin contents in the pre-dried samples of the plant, and plant components were determined. Hemicellulose contents were calculated by the difference between NDF and ADF, and cellulose contents by the difference between ADF and lignin.

The data were subjected to analysis of variance (ANOVA) using the Sisvar 5.0 program. Significant means were subjected to first-degree and second-degree regression models at 1% and 5% probability level to compare the leaching fractions. The Tukey's test at 5% probability was used to compare the varieties.

Results and discussion

The interaction between varieties and leaching fractions had no effect on the studied variables. The leaching fractions had no effect (p>0.05) on the leaf, stem, and panicle dry matter, ADF, cellulose, hemicellulose, and lignin contents.

The varieties had effect (p<0.05) on the plant components (Table 2). The leaf dry matter had higher proportion (24.6%) in relation to the total dry matter than the other plant components of the F305 variety. This result confirms those reported by Albuquerque et al. (2013), who evaluated seven genotypes of sorghum in Leme do Prado MG, Brazil, and found higher proportion of leaves for this variety. The Volumax variety had similar leaf proportion to those reported by Avelino et al. (2011), and Botelho et al. (2010), varying from 20.69% to 25.16% in relation to the total dry matter.

The Sudao variety presented a lower (p<0.05) proportion of leaves, with stems epresenting 68% of the total dry matter, whereas the F305 had 59.7%, and Volumax had 53.1%. In the context of conservation of forages for feeding ruminants, the percentage of stems of the plants is important for the lactic fermentation of the silage because of their higher concentrations of soluble carbohydrates, which are the main substrate for an adequate fermentation with lower losses of ensiled matter (Zanine et al. al., 2007).

The Volumax variety presented greater proportion of the panicle ( p<0.05) in the total dry matter, denoting the great potential of this variety to increase the sorghum silage quality. This component presents higher nutritive value than the other components of the plant, and high dry matter contents in this variety (Albuquerque et al., 2013; Cabral et al, 2003).

The production variables are affected by the percentages of the leaf, stem, and panicle components. According to Perazzo et al. (2014), although forage sorghums present high yields of dry matter, their nutritional values may be low due to their higher percentage of stems in relation to leaves, and panicles. Perazzo et al. (2014) evaluated 32 forage sorghum cultivars in the Brazilian Semiarid region and found a positive correlation between stem percentage and total dry matter.

The leaf dry matter content of the different sorghum varieties presented no difference (p>0.05) (Table 3), with mean of 33%. The leaf dry matter content affected (p<0.05) the stem, panicle, and total dry matter of the plants. The use of forage sorghum cultivars that have succulent or dry stems may explain the differences in dry matter content of the varieties studied. The stem dry matter content of the F305 variety (32.68%) indicated its dry stem characteristic, whereas Volumax (25.58%), and Sudao (25.46%) had succulent stems, denoting their higher concentration of soluble carbohydrates, and suitability for ensiling. The percentage of panicle (p<0.05) was affected by the varieties, with higher values for Volumax (39.39%) and Sudao (34.81%).

The Volumax, and F305 varieties had higher total dry matter contents, which were affected by the panicle and stem dry matter, respectively. Franca et al. (2011) evaluated the quality of silages of hybrid sorghums and found total dry matter varying from 21.6% to 28.7%. In the present study, the total dry matter varied from 27.82% to 32.84%. These values were adequate, since total dry matter content must be above 25%, and with an adequate level of soluble carbohydrates for an adequate fermentation in the ensiling process. (Mc Donald; Henderson; Heron, 1991)

The F305 variety had higher leaf (93.56%), stem (94.79%), and total (94.53%) organic matter contents, followed by the Volumax, with 94.26% (stem), and 93.92% (total). The organic matter contents of the panicle component presented no difference (p>0.05) between the varieties. The Sudao variety presented higher (p<0.05) leaf, stem, and total mineral matter contents than the other varieties, denoting its higher genetic potential to uptake soil salts. This is a characteristic that is important for the Semiarid region of the Northeast of Brazil because several production systems in this region use saline water, and soils under salinization processes.

The crude protein contents of the sorghum varieties differed ( p<0.05). The F305 variety had the lowest crude protein contents in all plant components, and total plant. Volumax and Sudao had equal crude protein contents in the leaves (Volumax 12.5%, and Sudao 12.8%), stems (Volumax 3.6%, and Sudao 3.8%) and panicles (Volumax 11.0%, and Sudao 11.2%). The Volumax variety had higher ( p<0.05) total crude protein content (7.40%) than the other varieties due to the greater proportion of the panicle component of this variety (Table 2), denoting the potential of the panicle component to increase the nutritive value of sorghum. These results confirm those found by other authors (Silva et al., 2011; Neumann et al., 2002; Cabral et al., 2003).

The stem of all varieties presented lower crude protein contents than the other plant components, with an average of 3.4%. This confirm the results reported by Albuquerque et al. (2013), who found stem crude protein contents of 2.88% to 3.66% when evaluating seven forage sorghum varieties in different locations. Therefore, this is the main component responsible for decreasing silage quality, in terms of nutritional value.

Neutral detergent fiber (NDF), acid detergent fiber (ADF), hemicellulose, cellulose, and lignin contents of the plant components of the sorghum varieties evaluated are shown in Table 4. The Sudao variety had lower ( p<0.05) leaf NDF (60.73%), and hemicellulose (27.77%) contents; and F305 had lower ( p<0.05) leaf lignin (7.95%) content. The leaf ADF contents of the varieties evaluated were equal ( p<0.05).

The F305 variety presented lower ( p<0.05) stem NDF (54.48%), ADF (29.90%), and cellulose (22.54%) than the other varieties, denoting a better stem quality. The Volumax variety presented higher ( p<0.05) values for all parameters evaluated in the stem component, and no differences (p>0.05) for hemicellulose, and lignin, when compared to the other varieties.

The Volumax and F305 varieties presented lower (p<0.05) panicle NDF, ADF, and cellulose contents. The F305 presented lower ( p<0.05) panicle lignin content than the other varieties (6.43%).

The F305 variety had lower (p<0.05) total NDF, ADF, cellulose, and lignin contents than the other varieties, denoting a better nutritional quality of the cell wall components.

Stem quality is determinant to a satisfactory forage sorghum; it has greater participation on the nutritive value of the plant because it presents greater proportion than the other components. According to Flaresso, Gross, and Almeida (2000), the stem component can affect negatively the nutritional quality of silages due to its greater fiber contents. However, increases of panicle contents in the silage composition increase non-fibrous carbohydrate contents, thus improving its nutritional value (Cabral et al., 2003).

The leaching fractions had significant effect (p<0.05) on crude protein, organic matter, mineral matter, and NDF contents. The crude protein content of the forage sorghum varieties increased with increasing leaching fractions (Figure 1). Increasing leaching fractions results in lower electrical conductivities through the soil profile around the root system of the crop (Assis Junior et al., 2007, Guimaraes et al., 2016, Simoes et al., 2016); this may have affected the evaluated characteristics. The lowest leaching fractions decreased crude protein contents in all evaluated components of the plant (stem, leaves, and panicle). These decreases in protein contents may be due to reductions in nitrogen uptake by the plant, or changes in assimilate distribution in the plant (Vieira et al., 2005).

The leaching fractions used reduced the organic matter content and, consequently, increased the mineral matter content in the leaves and panicles of the sorghum varieties evaluated. These increases in mineral matter represent the plants' ability to extract greater amounts of salts from the soil; this is a positive characteristic when the plants are under saline water or soils, since salt accumulations in the soil is an indicator of environmental degradation in semiarid regions and threatens the sustainability of irrigated agriculture in these regions (Azevedo et al., 2005).

The results showed a decrease in the leaf NDF of the plants with increasing leaching fraction of the saline water from fish farming (Figure 1D). Different results were found by Santos et al. (2013), Santos et al. (2014a), and Vieira et. al (2005). These authors found no effect of salinity on NDF in forage sorghum genotypes.

Conclusions

1. The application of leaching fractions of up to 15% increased the crude protein, and mineral content in the components of the forage sorghum plants evaluated.

2. The F305 variety presented better chemical-bromatological quality than the other varieties of sorghum when grown under irrigation with saline effluent from fish farming.

References

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Welson Lima Simoes (1*), Miguel Julio Machado Guimaraes (2), Gherman Garcia Leal de Araujo (1), Lilia Gomes Willadino (3), Alexandre Fernandes Perazzo (4), Leticia dos Santos Belfort (5)

(1) Brazilian Agricultural Research Corporation, Petrolina, Brazil

(2) Federal University of San Francisco Valley, Juazeiro, Brazil

(3) Federal Rural University of Pernambuco, Recife, Brazil

(4) Federal University of Paraiba, Areia, Brazil

(5) University of Pernambuco, Petrolina, Brazil

(*) Corresponding author, e-mail: welson.simoes@embrapa.br

Received: 06 April 2017

Accepted: 08 October 2018
Table 1. Chemical characteristics of the irrigation water from the fish
farming

[Ca.sup.2+]   [Mg.sup.2+]   [Na.sup.+]   [K.sup.+]    [Cl.sup.-]   pH

                            [mmol.sub.c] [L.sup.-1]
12.6          7.7           7.2          0.34         35.2         8.19

[Ca.sup.2+]   EC 25[degrees]C   Hardness Ca[CO.sub.3]   SAR

              dS [m.sup.-1]     mg [L.sup.-1]
12.6          2.57              50.75                   2.26

EC = electrical conductivity; SAR = sodium adsorption rate

Table 2. Percentages of leaf, stem, and panicle dry matter in relation
to the total dry matter of forage sorghum plants irrigated with saline
effluent from fish farming.

Variety   Leaf     Stem     Panicle

Volumax   21.8 b   53.1 c   25.1 a
F305      24.6 a   59.7 b   15.7 b
Sudao     20.0 b   68.0 a   12.0 c
Mean      22.2     60.3     17.6
CV (%)    12.52     6.60    13.19

Means followed by the same letter in the columns do not differ by the
Tukey's test at 5% probability.

Table 3. Organic matter, dry matter, mineral matter, and crude protein
of forage sorghum varieties grown under different leaching fractions of
saline effluent from fish farming.

Variety              Leaf      Stem      Panicle    Total
                               Dry matter (%)

Volumax              33.59 a   25.58 b   39.39 a    31.02 ab
F305                 35.22 a   32.68 a   29.23 b    32.84 a
Sudao                30.53 a   25.46 b   34.81 ab   27.82 b
Mean                 33.11     27.91     34.48      30.56
CV (%)               16.99     14.32     20.87      12.88
                             Organic matter (%)
Volumax              91.89 b   94.26 a   94.95 a    93.92 a
F305                 93.56 a   94.79 a   95.04 a    94.53 a
Sudao                90.55 c   93.28 b   94.52 a    92.9 b
Mean                 92.00     94.11     94.84      93.78
CV (%)                1.09      1.03      0.87       0.82
                             Mineral matter (%)
Volumax               8.11 b    5.74 b    5.05 a     6.08 b
F305                  6.44 c    5.21 b    4.96 a     5.47 b
Sudao                 9.45 a    6.72 a    5.48 a     7.10 a
Mean                  8.00      5.89      5.16       6.22
CV (%)               12.51     16.52     16.05      12.4
                             Crude protein (%)
Volumax              12.5 a     3.6 a    11.0 a      7.40 a
F305                  9.4 b     2.6 b    10.4 b      5.5 c
Sudao                12.8 a     3.9 a    11.2 a      6.55 b
Mean                 11.5       3.4      10.9        6.48
CV (%)                9.32      8.86      5.26       7.9

Means followed by the same letter in the columns do not differ by the
Tukey's test at 5% probability.

Table 4. Neutral detergent fiber (NDF), acid detergent fiber (ADF),
hemicellulose, cellulose, and lignin contents of forage sorghum
varieties grown under different leaching fractions of saline effluent
from fish farming.

Variety         Leaf         Stem         Panicle      Total
                                     NDF

Volumax         64.44 a      64.90 a      54.65 b      62.09 a
F305            64.26 a      54.48 c      50.93 b      56.30 b
Sudao           60.73 b      58.51 b      66.19 a      59.95 a
Mean            63.14        59.30        57.26        59.45
CV (%)           4.32         7.44        12.56         4.25
                                     ADF
Volumax         32.74 (ns)   40.88 a      24.89 b      34.99 a
F305            30.93 (ns)   29.90 c      22.72 b      28.97 b
Sudao           32.96 (ns)   34.17 b      35.82 a      34.16 a
Mean            32.21        34.98        27.82        32.71
CV (%)           8.33         6.11        12.64         4.1
                              Hemicellulose
Volumax         31.69 a      24.02 (ns)   29.75 (ns)   27.10 a
F305            33.33 a      24.58 (ns)   28.2 (ns)    27.33 a
Sudao           27.77 b      24.34 (ns)   30.36 (ns)   25.79 a
Mean            30.93        24.31        29.44        26.75
CV (%)          12.36        17.7         21.82         9.44
                               Cellulose
Volumax         22.63 (ns)   31.94 a      15.89 b      25.80 a
F305            22.98 (ns)   22.54 c      16.29 b      21.6 b
Sudao           22.06 (ns)   26.41 b      22.69 a      25.14 a
Mean            22.55        26.96        18.29        24.18
CV (%)          11.91        12.25        18.93         9.59
                                 Lignin
Volumax         10.11 a       8.94 (ns)    9.01 b       9.18 a
F305             7.95 b       7.36 (ns)    6.43 c       7.38 b
Sudao           10.61 a       7.67 (ns)   12.56 a       9.02 ab
Mean             9.56         7.99         9.33         8.53
CV (%)          23.06        31.25        28.01        23.6

Means followed by the same letter in the columns do not differ by the
Tukey's test at 5% probability. (ns) = not significant.
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Title Annotation:Article
Author:Simoes, Welson Lima; Guimaraes, Miguel Julio Machado; de Araujo, Gherman Garcia Leal; Willadino, Lil
Publication:Comunicata Scientiae
Geographic Code:3BRAZ
Date:Jan 1, 2019
Words:4525
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