Investigation the effect of water deficit on agronomical characteristics and growth indices of winter rapeseed cultivars

Subject Areas : New Finding in Agriculture

S. Soleimanpour ¹ (M. Sc. in Agriculture, Agricultural and Natural Resource Research Center, Kermanshah, Iran)
A. H. Shiranirad ² (Scientific Member of Seed and Plant Improvement Institute, Karaj, Iran)
H. Madani ³ (Associ. Prof., Islamic Azad University, Arak Branch, Iran)
A. Rezaeizad ⁴ (Scientific Member of Agricultural and Natural Resource Research Center, Kermanshah, Iran)
S. Fareghi ⁵ (Scientific Member of Agricultural and Natural Resource Research Center, Kermanshah, Iran)

Received: 2015-12-01 Accepted : 2015-12-01 Published : 2009-05-22

Keywords: Drought stress, Grain yield, Rapeseed, oil seed and yield components,

Abstract :

This study was done to investigate the effect of water deficit on agronomical characteristics and growth indices of winter rapeseed cultivars in Kermanshah region. The experiment was performed by using a split plot design based on RCBD with 3 replications, in the farm research of Eslamabad in Kermanshah. The treatments were selected as drought stress (D) as the main plot in two levels convectional irrigation or irrigation after 80 mm evaporation from A class pan (D1) and stopping irrigation since flowering stage (D2), and variety (V) as the sub- plot in 9 levels  consist of Opera(V1), ARC-5(V2), Dexter(V3), SLM046(V4), Zarfam(V5), Okapi(V6), Talaye(V7), Licord(V8) and Modena(V9). Investigated agronomical characteristics were: the plant weight, stem diameter, the number of secondary branches in the plant, the number of pods in the main stem, the number of pods in the secondary branches, the number of pods in the plant, the number of grains in the pods of main stem, the number of grains in the secondary branches’ pod, the number of grain in plant’s pod, the 1000 grain weight, the percentage of grain’s oil, grain yield, oil yield, biological yield, harvest index, Total Dry Weight(TDW) and Leaf Area Index(LAI).The result showed that stopping of irrigation(drought stress) since flowering stage, had deleterious effect on the growth, yield, yield components and agronomical characters, so that observed difference were 1% and 5% significant. The simple effect of variety on the stem diameter, the number of pods in the secondary branches, the no. of pods in plant, the no. of grain in the secondary branches’ pods, the no. of grain in plant’s pods was not significant, but had considerable effect on the other characters. The interaction effects between irrigation and variety was only significant on the biological yield, harvest index and percentage of oil grain, and was not significant on the other characters. The variety of SLM046 based on the oil yield(1870 kg/ha), grain yield (4187 kg/ha), yield components and the stress tolerance index was put in the best group and Talaye, Zarfam, Licord, Opera, ARC-5, Dexter, Okapi and Modena varieties were put in the other groups. The analysis of the stage of growth showed that drought stress increasing causes the Total Dry Weight and the Leaf Area Index decreasing. The percentage of mentioned factors in SLM046 variety was less than other varieties.

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