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Information Journal Paper

Title

Effect of Irrigation Regimes and Planting Dates on Forage Yield of Grass Pea (Lathyrus sativus L.) Genotypes

Pages

  109-117

Abstract

 In terms of drought resistance, grass pea is a desirable crop in crop rotations. In order to determine the effects of changing planting date from spring to autumn to benefit more from green water (fall and winter rainfalls) and reduce dependence on irrigation water, this research was carried out with three irrigation regimes (full irrigation, supplementary irrigation, and no irrigation (dryland)) in Borujerd Agricultural Research Station in two agricultural years (2017 and 2019). The study was conducted as a split plot experiment arranged in a randomized complete blocks design with three replications. The main plots were three planting dates (autumn, February (expectatation), and March (generally used in the region)), and sub-plots were 13 genotypes of native populations (NorAbad, Zanjan, Borujerd1-3, KhoramAbad, Dorud, and Aleshtar) and promising lines. The results showed that the effects of years, planting dates, genotypes, and their interactions were significant. The highest fresh and forage yields were obtained at Nov. planting date in all conditions. The highest fresh and dry forage yields were achived by Br1 (27.93 t ha-1) and 9 (t ha-1) and Br2 24.07 (t ha-1) and 6.07 (t ha-1) gentypes at full irrigation and 16.53 (t ha-1) and 3.13 (t ha-1) for Noorabad and 16.4 (t ha-1) and 3.4 (t ha-1) for SL5 and 16.6 & 3.3 (t ha-1) for SL1 at dryland conditions, respectively. Therefore, Nov. planting date is superior to others and SL5 line, Boroujerd2, and Dorod genotypes are recommended for forage production.

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