Effects Of Straw Returning Field And Nitrogen Fertilizer Application Rate On Growth And Yield Of Maize Under Drip Irrigation

This study investigated the effects of straw returning and nitrogen application on the growth and yield of corn under drip irrigation.The aim was to provide a scientific basis for the scientific application of straw returning and rational application of nitrogen fertilizer.With Hengdan 188 as the test maize variety,two treatment groups were established:straw returning and no straw returning,and 5 nitrogen fertilizer levels(pure nitrogen)were 0 kg/hm~2,100kg/hm~2,200 kg/hm~2,300 kg/hm~2 and 400 kg/hm~2 were studied.The effects of straw returning and nitrogen application on corn growth and yield under drip irrigation under film were studied.The results showed that:1.The use of straw returning and nitrogen fertilizer can increase the plant height and ear height of corn.Under the condition of straw returning to field,the nitrogen application rate of400 kg/hm~2 was the most obvious.Under the condition of no straw returning,the application of300 kg/hm~2 of nitrogen fertilizer had a significant effect on the ear height,and the application of400 kg/hm~2 of nitrogen fertilizer was applied.Treatment has a large impact on plant height.2.The use of straw returning and nitrogen fertilizer has a significant effect on the accumulation of dry matter.The optimum nitrogen application rate in the treatment of straw returning to the field is 200 kg/hm~2.During the whole growth period,leaves,stems and sheaths the distribution of dry matter first increased,then decreased,and the dry matter distribution of reproductive organs increased.3.The use of straw returning and nitrogen fertilizer significantly promoted the absorption of nitrogen,and the trend of impact was almost the same as the trend of dry matter accumulation.At the maturity stage,nitrogen accumulation was carried out when the nitrogen application rate was 200 kg/hm~2.The total amount and accumulation rate are the highest.In the nitrogen distribution of various organs of corn,the nitrogen allocated to the reproductive organs under this treatment is also higher.4.The use of straw returning and nitrogen fertilizer significantly promoted the LAI of corn plants throughout their growth period,reduced the rate of LAI decline in the late growth stage,and also increased the chlorophyll content(SPAD value).The optimum nitrogen application rate for leaf area index and SPAD value in straw returning treatment was 200 kg/hm~2.5.The effect of straw returning and nitrogen fertilizer on the yield and yield components was significant.In the straw returning treatment,the yield of 200 kg/hm~2 treatment was the highest,and the treatment with 300 kg/hm~2 was the most in the treatment without straw returning.Good,under the same nitrogen level,the yield of straw returning to the field is better,and the return of straw to the field improves the utilization rate of nitrogen fertilizer.In summary,the amount of straw returning and nitrogen fertilizer can significantly increase the dry matter and nitrogen accumulation of the plant,meanwhile the straw returning to the field reduces the use of nitrogen fertilizer,and also ensures the adequate supply of nitrogen fertilizer in the late growth stage of the maize plant,and promotes the dry matter of the plant.The increase of nitrogen,in turn,increases the leaf area index during the late growth period,which enhances photosynthesis and ultimately increases yield.As the amount of nitrogen fertilizer applied increases,the indicators do not increase,and the utilization rate of nitrogen fertilizers will gradually decline.The scientific and rational fertilization should be carried out in production to control the nutrient demand of corn in each growing season,thereby increasing production.