Planting Dates Effect on Productivity of Wheat Genotypes Using Multivariate Analysis

摘要

Twenty wheat ( Triticum aestivum) genotypes were evaluated at different sowing dates ( 15 October, 01 November and 15.November ). MANCOVA using days to maturity as covariate was conducted to test the effects of sowing dates and genotypes on grain yield ,stalk yield and harvest index. . The results revealed no significant differences due to genotypes or the interaction between genotypes and sowing dates. However, planting dates had a highly significant effect on grain yield, stalk yield and harvest index. Grain yield, stalk yield and harvest index are also found to be significantly correlated, while days to maturity is significantly correlated to those three yield components but not to the other covariates measured (plant height, seed weight and days to flowering). Planting the onset of November resulted in the highest grain yield (2.48 t/ha), stalk yield (2.203 t/ha) and harvest index (23.27%).