Behavior of some Bread Wheat Genotypes under Different Planting Dates and Nitrogen Fertilizer Levels in Sohag Governorate

Abstract

Two field experiments were conducted in two successive seasons of 2015/2016 and 2016/2017 at the Research Farm Al-Kawthar, Faculty of Agriculture, Sohag University, to determine the effect of two planting dates (15 November and10 December) and three nitrogen fertilizer levels (50, 75 and 100 kg N/fed.) on yield and its components of four bread wheat genotypes (Sids 12, Giza 168, NGB 6404 and NGB 10893). A randomized complete block design (RCBD) in split- split plot with four replications was used. Data indicated that the planting dates were significantly effects on all studied traits except spike length and straw yield in both seasons, as well as nitrogen fertilizer levels and genotypes had significantly effect on the all studied traits; plant height (cm), spike length (cm), 1000-grain weight (g), grain yield (ard./fed.), biological yield (ton/fed.), straw yield (ton/fed.) and harvest index(%) in the both seasons. Increasing N up to 100 kg/fed increased yield and its attributes of wheat in both growing seasons except plant height (cm), spike length (cm) and harvest index (%). Sids 12 and NGB 10893 genotypes produced the highest values of grain yield compared to other genotypes in both seasons. Moreover, NGB 10893 accession produced the maximum values of spike length (cm) and1000-grain weight (g) in both seasons, while NGB 6404 accession produced the tallest plants. Late planting (10 December) increased significantly plant height (cm), spike length (cm), 1000-grain weight, grain yield (ard./fed.), biological and straw yields (ton/fed.).In general the highest grain yields (21.59 and 21.04 ard./fed.) were obtained by Sids 12 genotype when planted in 10 December and application of 100 kg N/fed., and NGB 10893 genotype when planted in 10 December and fertilized with 75kg N/fed. interaction treatments, respectively.