Effect Of Water And Fertilizer Interaction On Eco-physiological Characteristics Of Winter Wheat

1 planted winter wheat varieties Zhoumai18 and Jimai20 under a rain shelter to investigate the relationship between water-nitrogen combinations and wheat physiological characteristics.I selected 3 soil water content treatments(75～80%,55～60%,and 35～45%of field capacity) and 2 nitrogen fertilizer content treatments(120kg/hm² and 200kg/hm²).Photosynthetic efficiency was positively correlated with soil water content.When soil water content was relatively high(55～60%and 75～80%of field capacity),photosynthesis of both varieties were positively correlated with nitrogen availability.This fertilization effect was less pronounced when soil water content was 75～80%of field capacity.When soil water content was low(35～45%),photosynthesis was negatively correlated with nitrogen availability.When soil water content was 55～60%,CAT activity,POD activity,and soluble protein content were positively correlated with nitrogen availability,while MDA content was negatively correlated with nitrogen availability.Soluble carbohydrate content was negatively correlated with soil water content.When soil water content was 55～60%,soluble carbohydrate content was positively correlated with nitrogen availability.When soil water content was 35～45%,soluble carbohydrate content was negatively correlated with nitrogen availability.Flag leaf photosynthetic rate,chlorophyll content and RuBPcase activity showed significant positive correlations with each other.Transpiration rate(Tr) and soluble protein content were negatively correlated(R= -0.74^**). When soil water content was relatively high(55～60%and 75～80%of field capacity),spike number,grain number,TKF,spikelet number and spike length were all positively correlated with nitrogen availability.Spikelet number and spike length were negatively correlated with nitrogen availability when soil water content was 35～40%.