Effects Of Nitrogen Fertilizer On The Growth,Yield ,Water And Fertilizer Utilization Of Corn Under Rainfall Harvesting

The pattern of rainwater harvesting is an efficient cultivation measure which can effectively preserve soil moisture and play a certain role in the coordinated supply of soil water and fertilizer.The suitable nitrogen fertilizer is beneficial to crop growth,making crops efficient use of water and nutrients,so as to save water and fertilizer effectively and increase the yield.In order to further improve the water and nitrogenfertilizer coupling technology under the corn harvesting mode,in order to achieve an increase in water and fertilizer utilization and alleviate the loss caused by the drought to corn production,thereby promoting high yield and stable corn production.In this study,a two-factor split-zone test was designed to set different nitrogen application rates?0-320 kg/hm²?under both conventional film-covering and rain-covered film-covering modes.The effects of different water-fertilizer coupling treatments on corn growth,yield,and water and fertilizer were studied.The main findings and conclusions are as follows:1.The full-film coverage mode,the emergence rate of corn and plant height,stem diameter,leaf area and relative content of chlorophyll were greater than the traditional model.Nitrogen application rate in the range of 80-160 kg/hm² are increasing.Under the traditional model,the photosynthetic characteristics of ear leaves were greater than those of full-film mulching patterns.The Pn,Gs,Tr,and intercellular CO₂ flux of maize increased with the increase of fertilizer application rate.However when the fertilization amount was more than 160 kg/hm².The decrease trend of Pn and Tr is especially obvious.2.Under the whole film mulching,the whole dry matter accumulation and nitrogen accumulation of maize during the whole growth period were higher than those of the traditional patterns.For different N rates,the N application rate reached160-240 kg/hm²,Dry matter accumulation and plant nitrogen accumulation were relatively high.Full-film mulching did not improve the dry matter turnover,turnover rate and grain contribution rate of corn stems and leaves.With the increase of fertilizer,the dry matter and nitrogen accumulation rate of operation and grain contribution rate increased,but when the amount of fertilizer exceeds 160 kg/hm²,there will be a sharp decrease trend;in this test,the rain cover When the nitrogen application rate was 80kg/hm² in the film mode,the nitrogen characteristics such as leaf running rate and nitrogen content in the leaves and stems of the corn reached the maximum.3.Under the condition of full film mulching,the absorption of nutrients and water in maize was significantly promoted,and the increase of fertilizer use was more significant than that of water use,And the fertilizer rate of more than 240 kg/hm²,instead of increasing water use efficiency showed a trend of decline;In the full-film mulching model,the N fertilizer use efficiency,N fertilizer use efficiency and N fertilizer partial productivity reached the maximum at the rate of 80 kg/hm²,accounting for 31.53%,12.24%and 157.26%.4.Corn ear traits under the rain-covered film-mulching pattern were all superior to the traditional model,and the amount of fertilizer was increased with the increase of the amount of fertilizer in the test range.In the rain-covered film-covering mode,the overall yield was higher than the traditional film-mulching mode,with an increase in yield of 7.9%.When the nitrogen application rate was 80 kg/hm²,the maximum yield was 12581.1 kg/hm²,which was 11.4%higher than the minimum yield,which was higher than the traditional film-covering mode.Under-fertilization treatment increased production by 24.6%.