Search

This research was carried out as a factorial based on a randomized complete block design with four replications at greenhouse conditions. First factor was corn cultivars (D.C370, S.C647 and S.C704) and second factor included 3 levels of residual plant (without residual, root residual, root and shoot residual of wheat). The results showed that percent and mean emergence time, leaf area, biologic and kernel yield, number of kernels per ear, number of kernels per row and ear length was influenced of wheat residual, and maximum positive effects on mentioned traits, obtained at root and shoot residual of wheat. 100-kernel weight and plant height of cultivars showed significant difference. Effect of residual plant on biologic yield, kernel yield, number of kernels per ear, number of kernels per row of S.C704 wasn’t significant, but other hybrids showed significant difference to residual wheat. 100-kernel weight, row number per ear, ear length and plant height of D.C370 was less than other hybrids, significantly.

This research in order to study of tolerance ability of wheat cultivates yield and yield components to salinity of irrigation water at sensitive stages of growth, was carried out as a factorial based on a randomized complete block design with 3 replications at greenhouse of Agricultural Faculty of Bu-Ali Sina University, in 2009. Treatments were included wheat cultivars of Alvand, Tous, Sayson and Navid and salinity of irrigation water induced by sodium chloride at five levels of 0, 4, 8, 12 and 16 dS m-1. The results showed that percentage and rate of emergence, plant height, 1000-grain weight, number of seed per spike, number of spike per pot, biological and grain yield reduced by increasing salinity level. At all stress levels Navid cv. had highest emergence percentage. In non-stress and 4 dS m-1, Alvand cv. and at higher levels of stress, Tous cv. had high height in reproductive phase. At control and 4 dS m-1, Sayson cv. and at 8, 12 and 16 dS m-1, Tous cv. in majority of yield and yield components traits had significant superior than other cultivars. Tolerance index of Sayson cv. at 4 and 8 dS m-1 was more than other cultivars but at 12 and 16 dS m-1, maximum value of this index was belonged to Tous cv. At all salinity levels, Alvand cv. had least tolerance index to stress. Number of spike per pot had maximum direct effect on grain yield of wheat cultivars in stress condition. Also indirect effect of biological yield via number of spike per pot than other its indirect effects, had maximum share in wheat seed yield.