Effect of Potassium and Nitrogen Levels on Productivity of Seds 12 Wheat Cultivar Under Delta North Condition.

Abstract

Two field experiments were conducted in 2014/2015 and 2015/2016 seasons at the Experimental Farm of Fac. of Agric. Kafrelsheikh university in the first season and Desouque Area in the second season, Egypt, to study the effect of potassium levels (0,36, 48 kg K2O/fed.), nitrogen levels (50, 65, 80 kg N/fed.) and their interaction on productivity of wheat cv. Seds 12. Treatments were arranged in split plot design with four replicates. The main plots included potassium levels, while nitrogen levels were allocated at the sub plots. The results revealed that increasing nitrogen rate from 50 to 80 kg N/fed. signficantly increased chlorophyl content, plant dry weight/m2, plant height, LAI, flage leaf area, spike length, number of spikes/m2, number of grains /spike, weight of 1000-grain, grain and straw yield (ton/ fed), harvest index and grain protein content in both seasons. There was no significant difference between 80 and 65 kg N/fed. in some mentioned traits.Application of potassium fertilizer resulted in significant increase in all the mentioned traits compared with control treatment (without K) in both seasons. Application of 48 kg K2O /fed. recorded the highest values of all previous studied characters.The interaction between potassium and nitrogen levels had a significant effect on LAI, number of spikes/m2, number of grains /spike, weight of 1000-grain, grain yield (ton/ fed), harvest index and grain protein content in both seasons. Application of 80 kg N with 48 kg K2O/fed produced the highest values of these traits in both seasons. However, chlorophyll content, flag leaf area and spike length were not affected by the interaction in the two seasons. The other traits were significantly affected by the interaction between nitrogen and potassium levels in one season, only. It can be concluded that application of 80 or 65 kg N along 48 kg K2O /fed could be recommended for optimum grain yield of wheat cv. Seds 12 at Kafr El-Shiekh Governorate.