Effect of Water and Nitrogen Interaction on Plant Nutrients and Yield of Spring Wheat

The random block design experiment of water and nitrogen with three levels each was conducted to explore the effect of water/nitrogen interaction on plant nutrients and yield of spring wheat variety Ningchun 4.The main conclusions of the study were summarized as follows:(i)Under well-watered and dry conditions,from jointing stage to heading stage,the content of total nitrogen in wheat leaves were listed as high-nitrogen(HN)middle nitrogen(MN)zero-nitrogen(CK).However,under serious dry condition,the content of total nitrogen was the highest in the middle nitrogen(MND) treatment,and the lowest in the treatment of high-nitrogen(HND),which indicated that increasing nitrogen fertilizer can improve the accumulation of nitrogen in wheat leaves.(ii) Compared with no nitrogen treatment,nitrogen application can improve accumulation quantity of phosphorus in wheat plants.Under moderate drought conditions,phosphorus contents in wheat plants in CK and middle-nitrogen treatment were detected significantly higher than high-nitrogen treatment at flowering stage;Under the serious drought conditions,the highest phosphorus was detected in the middle-nitrogen treatment at ripening stage;but at other stages,the highest phosphorus were in high-nitrogen treatment;(iii)in the same nitrogen level,potassium content in plant leaves decreased with the severity of drought stress;Under three moisture conditions,potassium content has no significant difference,But the high-nitrogen treatments had the maximum in 1000-grain weight,grains per spike and grain weight per spike.Under the condition of three nitrogen levels,the middle drought treatments had the highest value in 1000-grain weight and spike grain weight per pot.