Study Of Different Nitrogen Treatments On Wue And Nue Of Winter Wheat Under Regulated Deficit Irrigation At Anthesis

Regulated deficit irrigation is an optimized irrigation system widely be used in agricultural production.Aikang 58 was chosen as experimental material to explore reasonable Irrigation and Nitrogen Application Regimes,and ultimately put forward to increase water use efficiency in north Henan Province.This study was carried out at Xinxiang comprehensive Experimental Station of Chinese Academy of Agricultural Sciences during the wheat growing season in 2014-2015.The field experiments were designed by split block.Water treatment was the main factor,there were two levels,full irrigation was marked as W₁ and regulated deficit irrigation was marked as W₀.Nitrogen measures were vice factors and there were 3 levels:low fertilization?N₀?,middle fertilization?N₁?,and high fertilization?N₂?.Regulated deficit irrigation processing period was the flowering period of wheat.The growth physiology of the plants,plant nitrogen content,nitrogen accumulation and translocation of above ground plant,soil nitrogen content,soil moisture content,grain filling dynamics,yield constitutions were tested.We analyzed the water and nitrogen utilization efficiency of winter wheat under different water and nitrogen treatments.In order to prove the water and nitrogen use efficiency and save the water and nitrogen resource.The main results were as follows:1.From over-winter to filling stage,W₀ treatment could efficiently enhance the population during filling stage,the height of wheat increased with the increasing level of nitrogen and water.In over-winter and jointing stage,leaf chlorophyll content of wheat under N₁ and N₂ treatment were obviously higher than N₀ treatment,but there was no significant difference between N₁ and N₂ treatment.In flowering period after water treatments,leaf chlorophyll content under W₀ treatment was significantly higher than W₁ treatment.However,during filling stage,leaf chlorophyll content of W₁ treatment was significantly higher than W₀ treatment under the same fertilizer treatment.2.The dry matter accumulation of winter wheat plant under N₂ treatment was significantly higher than N₁ and N₀ treatment during over-winter and jointing stage,and the dry matter accumulation of winter wheat plant under N₁W₀ treatment was the highest during anthesis and maturity stage.Plant nitrogenaccumulation manifested as N₂ > N₁ > N₀,and under the same fertilizer treatment,plant nitrogen accumulation was significantly higher with W₀ treatment than W₁ treatment from anthesis to maturity stage.3.The water treatment was greater on wheat yield than nitrogen fertilizer treatment in the study.Under N₀ treatment,the 1000-kernel weight and the spikelet sterility number of W₁ treatment were higher than W₀ treatment,but the spike length,the spikelet number and grain number were lower.Under N₁ treatment,the spike length and grain number of W₁ treatment were higher than W₀ treatment,but the1000-kernel weight was lower.Under N₂ treatment,the spike length and grain number of W₁ treatment were higher than W₀ treatment,but the 1000-kernel weight was lower.The wheat yield of N₁W₀ treatment was 10528.33 Kg?hm-2 and it was significantly higher than other treatments.4.Under the same water treatment,the amount of post-anthesis assimilated dry matter transferring into grain,translation rate of pre-anthesis dry matter and contribution rate of post-anthesis assimilated dry matter to grain yield under N₀ treatment were significantly higher than N₁ and N₂ treatment.Under the same fertilizer treatment,the accumulation of post-anthesis dry matter transferring into grain and the contribution rate of post-anthesis assimilated dry matter to grain yield under W₀ treatment were significantly higher than W₁ treatment,but contribution rate of pre-anthesis assimilated dry matter to grain yield,translation of pre-anthesis dry matter and nitrogen harvest index of W₁ treatment were higher than W₀ treatment.Under the same water treatment,total nitrogen accumulation amount,nitrogen translocation amount and nitrogen translocation efficiency manifested as N₂ > N₁ > N₀.Under the same fertilizer treatment,nitrogen transfer amount of vegetative organ and nitrogen translocation efficiency of W₁ treatment were significantly higher than W₀ treatment,but total nitrogen accumulation amount of W₀ treatment was higher than W₁ treatment.5.The nitrogen utilization efficiency of N₀W₁ treatment was the highest,the nitrogen harvest index of N₁W₁ treatment was the highest,nitrogen partial factor productivity and nitrogen agronomic efficiency of N₁W₀ treatment were the highest,total nitrogen accumulation amount of N₂W₁ treatment was the highest.Under W₁ treatment,total evapotranspiration of N₂ treatment was significantly higher than N₁ and N₀treatment;Under W₀ treatment,total evapotranspiration of N₁ treatment was significantly higher than N₂ and N₀ treatment.6.Under N₀ and N₁ treatment,water utilization efficiency and irrigation water use efficiency of W₀ treatment were all significantly higher than W₁ treatment,while under N₂ treatment,there was no difference in water utilization efficiency between W₀ and W₁ treatment.Under W₁ treatment,plant water utilization efficiency and irrigation water use efficiency of N₁ treatment were significantly higher than N₂ and N₀ treatment.And plant water utilization efficiency and irrigation water use efficiency of N₁W₀ treatment were the highest,and exceeded other treatment respectively by 15.48%⁴4.01% and 14.77% 59.89%.The study suggested that,water utilization efficiency,irrigation water use efficiency,nitrogen partial factor productivity and nitrogen agronomic efficiency of N₁W₀ treatment were the highest,and also the wheat yield.So the combination model of water and nitrogen could be promoted in this growing area to be studied furtherly.