Effect of sowing date and irrigation regimes on yield components, protein and galactomannan content of guar (Cyamopsis Tetragonoloba L.) in Iran climate

Abstract

In this study, the effects of irrigation regimes and sowing dates on growth, yield performance, protein and galactomannans of guar (Cyamopsis tetragonaloba L.) were monitored in Ilam province (latitude 37°8" min and Longitude 47°27"), Iran. A field experiment was conducted for two years during 2015 and 2016, using a split-split plot randomized block design including two sowing date (15th and 30th July), 4 irrigation regimes (once: after sowing, twice: after sowing and flowering, three times: after sowing, flowering and seed formation, and four times: after sowing, flowering, seed formation and before harvesting) and 3 genotypes (RGC1031, RGC 936 and RGC1066) with three replicates. Main seed yield attributes such as protein, and galactomannans content were evaluated. The results showed that late sowing date responded better in higher yield than to the earlier one (15th). There were not observed significant differences among studied genotypes in case of yield components, galactomannan and protein contents traits. According to ANOVA analysis, RGC-1066 with 4 times irrigation was suitable treatment in case of seed yield. Also the highest amount of protein and galactomannans was obtained in the late sowing date. These results indicated that guar can be put as an alternative crop and can be introduced as a new crop for cultivation in Iran climate.