Effects Of Water And Nitrogen Coupling On Physiological Characteristics And Yield And Quality Of Oat Under Drip Irrigation

In this experiment,the experiment was carried out to explore the influencemechanism of the photosynthetic characteristics of the leaves of different water(W1,W2,W3)nitrogen(NO,N1,N2,N3)under the coupling treatment of different water(W1,W2,W3)nitrogen(NO,N1,N2,N3)and the effect of anti aging physiological indexes on the yield and quality of Oat Seed.Find the best quality of water and nitrogen combination model.The main results are as follows:(1)there was significant difference in the effect of different water and nitrogen treatment on the photosynthetic characteristics of oat grains.In the filling period,the SPAD value,Pn,Ci,Gs,Tr of leaves increased and then decreased with the increase of nitrogen application.Under the condition of W1(low irrigation water)and W2(medium irrigation amount),applying a certain nitrogen fertilizer can increase the Pn and chlorophyll content of the flag leaf,but when the nitrogen fertilizer overdose(N3),the soil water potential will be reduced,the plant's absorption of soil water and nutrients is affected,and the Pn of the flag leaves is reduced,but the condition of W3(high irrigation water)condition is reduced.High nitrogen(N3)significantly increased flag leaf Pn,which was 45.8% higher than that of N0.(2)under the conditions of W1 and W2 irrigation,with the increase of nitrogen application,the content of MDA decreased first,and the lowest was in N2 treatment.It continued to increase nitrogen to N3 level,and the MDA content began to increase.In W3 irrigation,the MDA content of leaves continued to decrease when N3 treated,which effectively alleviated the physiological process of leaf senescence.The activity of POD and SOD at the filling stage has the highest value in W2N2 and W3N3,in which the POD activity of W2 and W3 increases by 61.1% and 49.6%,respectively,and W2 irrigation is more beneficial to the effect of Nitrogen Application on increasing the POD activity of leaves.(3)the reaction of water and nitrogen coupling in oat morphological indexes showed the highest oat plant height under the condition of W2N3 and W3N3,while the stem diameter and biomass of oat were the largest under the condition of W3N3.This shows that nitrogen application can significantly increase the height,stem diameter and biological yield of oat,but the height of oat plant height is not higher when the irrigation amount is increased during the filling period,while the biological yield and stem diameter continue to grow.(4)the optimal treatment of oat grain yield was W2N2 and W3N3,but W2N2 was higher than W3N3,and 2617kg/hm2 was analyzed from the component factor.The number of spikes and spikes were increased by proper amount of nitrogen and irrigation.However,the continuous irrigation during filling period could lead to the decrease of 1000 grain weight,and then the grain yield was affected.(5)from the grain crude protein content,lysine content and beta glucan content,when W2N3,the grain quality is the best.Nitrogen application significantly improved the grain quality of oats.Increasing irrigation amount during grain filling significantly decreased grain quality.