Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 54 3 2023 09 23 Effect of Irrigation Regimes and Planting Dates on Forage Yield of Grass Pea (Lathyrus sativus L.) Genotypes Effect of Irrigation Regimes and Planting Dates on Forage Yield of Grass Pea (Lathyrus sativus L.) Genotypes 109 117 93812 10.22059/ijfcs.2023.352981.654973 FA Mohammad Shahverdi Crop and Horticultural Science Research Department, Lorestan Agricultural and Natural Resources Research and Education Center, AREEO, Borujerd, Iran Mahmod Nasrolahi Plant Protection Science Research Department, Lorestan Agricultural and Natural Resources Research and Education Center, AREEO, Borujerd, Iran. Ali Reza Chegeni Animal Science Research Department, Lorestan Agricultural and Natural Resources Research and Education Center, AREEO, Borujerd, Iran. Morad Cheshmehnoor Crop and Horticultural Science Research Department, Lorestan Agricultural and Natural Resources Research and Education Center, AREEO, Borujerd, Iran. Hossin Astaraki Crop and Horticultural Science Research Department, Lorestan Agricultural and Natural Resources Research and Education Center, AREEO, Borujerd, Iran. Journal Article 2023 01 29 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. 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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