Response of three wheat cultivars to split application of nitrogen fertilization rates in sandy soil

摘要

Two field experiments were carried out during 2000/2001 and 2001/2002 seasons at El-Ghoraieb Experimental Farm, newly sandy soil, Assiut University to study the response of three bread wheat cultivars (Giza 164, Giza 165 and Sakha 8) to three nitrogen rates (75, 100 and 125 kg N/fed.) and split application of nitrogen at different growth stages; planting (P); tillering (T); elongation (E); anthesis (A) and milk ripening (M) at 2, 3, 4 or 5 doses. The results indicated that Giza 164 cultivar was superior to the other cultivars and gave the highest grain yield (8.60 ard/fed.). Increasing nitrogen rate up to 125 kg N/fed. increased yield and its components of all cultivars. The highest grain (9.40 ard/fed.) and straw (3.608 t/fed.) yields were obtained when nitrogen was applied at a rate 125kg N/fed. In addition, splitting nitrogen rates in frequent doses increased yield and its components. The highest grain yield (9.53 ard/fed.) and straw yield (3.624 t/fed.) were obtained with splitting nitrogen rates at five doses. The highest grain yield (10.84 ard/fed.) and straw yield (4.23 t/fed.) were obtained from Giza 164 cultivar when the highest N rate (125 kg N/fed.) was applied and its added at five doses