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The study of lodging occurrence stages on grain yield damages and agronomical traits of two rice cultivars (Tarom and Shiroodi).

INTRODUCTION

Rice is a second main staple crop after wheat in Iran, cultivated in 570,000 hectares of irrigated area and 2.4 million tons of milled rice is produced. Iran still largely depends on rice imports to the tune of 0.8 million tons each year to meet the domestic consumer's demand. Therefore, hybrid rice with 20 -25% yield heterosis over conventional varieties happens to be the only viable option to enhance the production and productivity levels, since the area under rice cultivation cannot be further increased due to water shortages [5]. Lodging is a major problem in the production of cereal crops. Addition to decreasing productivity, lodging also decreases the quality of the rice grains in lodged plants [14]. The lower yield and decreased quality also lead directly to poor profits for farmers. It also causes difficulties in harvest operations and consequently results in increased production cost [15]. Lodging in rice may occur as a result of strong winds, heavy rain, water management, planting density, or an excessive use of fertilizer [1,6]. The loss of grain yield in lodged plants differs with the state of lodging and the time of lodging [19]. Lodging has been one of the important constraints on rice production for a long time. When lodging occurs, the canopy structure would be destroyed, and the capacity of photosynthetic rate and dry matter production sharply reduced [9]. In severe cases, it breaks stems or pulls the roots out, blocking the transportation of water, minerals and photosynthetic, leading to a substantial decline in yield and quality [3,16]. In recent years, as high-yielding rice cultivars characterized by large panicle, as well as simplified planting techniques such as direct-seeding and seedling broadcasting, are widely applied, the potential risk of lodging is increasing. In light of this, more and more attention has been paid to it, and many findings such as the causes for lodging, lodging damage mechanism, the prevention of lodging have been reported [4,11,12]. However, the effects of lodging time, which is always uncertain for its concern with irregular severe weather or pests and diseases, are still rarely studied so far. According to this situation, this study was lodging occurrence stages on grain yield damages and agronomical traits of two rice cultivars (Tarom and Shiroodi).

MATERIAL AND METHODS

The experiments were carried out at the experimental farm of Amol (36.3[degrees]E and 52.2[degrees]N; 110 m elevation), Iran, in 2012. The climate of this region is close to the warm Mediterranean climate, clear heat that, summers with high humidity and high temperature, with low rainfall and mild winters with copious precipitation. The experiment was a split -plot and in randomized complete block design with three replications. Two cultivars (Tarom and Shiroodi) were involved in main plot and artificial lodging performed at growth stages (panicle initiation, booting, milky, dough and ripening stages) along with control (non-lodging) has been set in sub--plot on main plot experiment layout. Before conducting the experiment, surface composite soil samples was taken and some properties of soil such as T.N.V., texture, P and K available, %O.C, pH and EC were analyzed. N, P and K fertilizers applied after soil analysis based on technical instructions of Rice Research Institute. For varieties Tarom Hashemi, urea nitrogen level of 100/ ha in turn three, Form (40% base, 30% of the tillering stage, 30% in young heading) and the source of phosphorus fertilizer triple superphosphate at a rate of 75 (kg.[ha.sup.-1]) and Potassium fertilizer, potassium sulfate at a rate of 100 (kg.ha-1), Form (50% base, 50% in young heading) and zinc fertilizers, of zinc sulfate was consumed at a rate of 25 kg per hectare (kg.ha-1). Farm management during the growth stage of weed control, Pest and disease etc. Rice Research Institute was conducted in accordance with the Technical Instructions. Plot size was 12 [m.sup.2] per treatment and seedlings were transplanted at 25 x 25cm spacing. Artificial lodging was made by pushing of plant stem into the ground in predicted stages. Grain yield, harvest index, tiller number, N content of grain and N uptake was calculated and the data were evaluated basis on statistical. 12 hill bottom-cut plant samples were taken in each plot to determine the dry matter and harvest index at physiological maturity. Grain and straw samples were analyzed for N content. Grain yields (14% moisture content) were measured at harvest from a 5 ([m.sup.2]) sample area per plot and converted to ton per hectare. All data collected in this study were subjected to analysis of variance (ANOVA) using SAS statistical program Mean comparisons were conducted with Duncan (p<0.05) using SAS software [13].

RESULTS AND DISCUSSION

Seed yield:

As the analysis of variance table (Table 1) shows, effect of variety and treatment effect (the creation of artificial lodging) and interaction effect variety * treatments on grain yield was significant (p<0.01). The study of interaction effected of varieties in various stages of lodging on seed yield showed that, Tarom variety of highest seed yield of the control treatment (no lodging) (6535 kg.[ha.sup.-1]) and minimum seed yield of the treated creating artificial lodging, heading in the young (2723 kg.[ha.sup.-1]), are obtained (Table 2). The highest and lowest grain yield in varieties of Shirudi obtained the same two treatments (9975, 4242 kg.[ha.sup.-1]). As a result, if the lodging in the primitive stages of growth occurs, damage to the lodging is reduced further yield and Upside yield levels approaching the lodging creation stage, the developmental stage of the plant, this is proof. Lodging is more effective elements in grain yield [9,18]. Photosynthetic capacity and dry matter production were decreased by change of planting densities and normal canopy condition [3] Grains may grow on panicle in lie down plants, so it caused to decrease quality and quantity of grain, therefore lodging caused to increase cost of production by disorder in harvesting time and increase of grain drying [4,17].

Harvest index:

As the analysis of variance table (Table 1) shows, effect of variety and treatment effect (the creation of artificial lodging) and interaction effect variety * treatments on harvest index was significant (p<0.01). The study of interaction effected of varieties in various stages of lodging on harvest index showed that, Tarom variety of highest harvest index of the control treatment (no lodging) (0.47%) and minimum harvest index in stage of Started of Young heading (0.31%), are obtained (Table 2).

Number of Tillers:

As the analysis of variance table (Table 1) shows, effect of variety and treatment effect (the creation of artificial lodging) on number of tillers was significant (p<0.01). Also, interaction effect variety * treatments on number of tillers non significant. The study of interaction effected of varieties in various stages of lodging on number of tillers showed that, Tarom variety of highest number of tillers of the control treatment (no lodging) (20.6) and minimum number of tillers in stage of Started of Young heading (17.6), are obtained (Table 2).

Grain nitrogen concentration:

As the analysis of variance table (Table 1) shows, effect of variety and treatment effect (the creation of artificial lodging) and interaction effect variety * treatments on grain nitrogen concentration was significant (p<0.01, 0.05). The study of interaction effected of varieties in various stages of lodging on grain nitrogen concentration showed that, Tarom and Shirodi variety of highest grain nitrogen concentration of the control treatment (no lodging), Started of Young heading, Dough stages (with 0.02%) are obtained (Table 2).

Grain N uptake:

As the analysis of variance table (Table 1) shows, effect of variety and treatment effect (the creation of artificial lodging) and interaction effect variety * treatments on grain N uptake was significant (p<0.01). The study of interaction effected of varieties in various stages of lodging on grain N uptake showed that, Shirodi variety of grain N uptake index of the control treatment (no lodging) (182) and minimum grain N uptake in stage of Started of Young heading in Tarom variety (54.8), obtained.

Conclusion:

Rice is the staple food of much of humanity, and this paper examined a method of militating against a particular constraint on rice production, lodging. Lodging may cause the loss of grain yield and quality [2,13], and so it is vitally important to develop methods to reduce lodging.

ARTICLE INFO

Article history:

Received 15 April 2014

Received in revised form 22 May 2014

Accepted 25 May 2014

Available online 15 June 2014

REFERENCES

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(1) P. Haghdoost, (2) M. Sam Daliri, (3) M. Mohamadian, (1) T. Ghasm

(1) Department of Agriculture, Chaloos Branch, Islamic Azad University, Chaloos, Iran.

(2) Associate professor, Department of Agriculture, Islamic Azad University, Chaloos Branch, Iran.

(3) Faculty member of Rice Research Institute of Iran (Deputy of Mazandaran - Amol), Iran.

Corresponding Author: Pari Haghdoost, Department of Agriculture, Chaloos Branch, Islamic Azad University, Chaloos, Iran.

E-mail: Haghdoost2014@gmail.com
Table 1: Analysis of variance on some agronomic traits.

SOV            DF       Seed        Harvest    Number of
                     yield (Kg.    Index (%)    Tillers
                    [ha.sup.-1])

Replication    2         ns           ns          ns
Variety        1         **           **          **
Error (a)      2        9662          0.0        0.25
Lodging        5         **           **          **
time stages

Variety *      5         **           **          ns
Lodging time

Error (b)      20       8845          0.0        0.65
CV %           --       1.61         1.02        3.08

SOV            Grain nitrogen   Grain N
               concentration    uptake

Replication          ns           ns
Variety              **           **
Error (a)           0.0          3.58
Lodging              **           **
time stages

Variety *            *            **
Lodging time

Error (b)           0.0          8.82
CV %                2.4          2.61

ns, * and ** : Non significant at the 5 and 1% levels probability
respectively.

Table 2: Main Comparison of some agronomic traits (Variety *
lodging time).

Treatment                      Seed        Harvest    Number of
(Variety *                  yield (Kg.    Index (%)    Tillers
lodging time)              [ha.sup.-1])

Tarom       Non-Lodging       6535d         0.47c       20.6c
            Started of        2723h         0.31h       17.6e
           Young heading

              Perfect         2893h         0.32h      18.3de
              Panicle

               Milky          4055g         0.4f       18.7cde
               Dough          5143f         0.44d      19.3cde
              harden          6532d         0.48b      20.3cd
Shiroodi    Non-Lodging       9975a         0.49a       36.3a
            Started of        4245g         0.35g       31.3b
           Young heading

              Perfect         5793e         0.39f       31.6b
              Panicle

               Milky          6668d         0.42e       32.3b
               Dough          7461c         0.45e       32.6b
              harden          8017b         0.45d       34.6b

Treatment                  Grain nitrogen   Grain N
(Variety *                 concentration    uptake
lodging time)

Tarom       Non-Lodging        0.02a        131.4c
            Started of         0.02a         54.8g
           Young heading

              Perfect          0.019a        55.7g
              Panicle

               Milky           0.019a        80.5f
               Dough           0.02a        103.3e
              harden           0.019a       128.09c
Shiroodi    Non-Lodging        0.018a       182.5a
            Started of         0.019a       83.29f
           Young heading

              Perfect          0.019a       111.07d
              Panicle

               Milky           0.019a       130.43c
               Dough           0.020a       151.15b
              harden           0.018a       151.51b

Means with similar letter were not significant at the 5%
probability level.
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Article Details
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Author:Haghdoost, P.; Daliri, M. Sam; Mohamadian, M.; Ghasm, T.
Publication:Advances in Environmental Biology
Article Type:Report
Geographic Code:7IRAN
Date:Jun 20, 2014
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