Effects Of Combined Application Of Organic And Inorganic Fertilizers And Incorporation Methods On Soil Fertility And Crop Yield After Multiple Wheat Cropping

In response to the practical problem of what kind of crops can be used to fertilize the soil after harvesting the spring wheat in Ningxia Irrigation Area,it will not affect the planting plan for the next year,the introduction of feed rapeseed as a green manure to improve the efficiency of land,light,temperature,water and other resource utilization Economic and ecological benefits.In this experiment,using Huayouza 62 as the test material,three field experiments were conducted on different application methods of green manure rape,combined application of organic and inorganic fertilizers,and different application amounts of rapeseed after spring wheat harvest.The soil organic matter and nitrogen,phosphorus,and potassium effective nutrient content after pressing(before sowing wheat)and after wheat harvesting,and simultaneously measuring the yield of wheat in the next crop after turning rape,discussed the effects of multiple rapeseed turned over as green manure on soil fertility and subsequent crops,the main research The results are as follows.1.Spring wheat and rapeseed have different requirements for soil nutrients.After the wheat was harvested,the average content of soil organic matter,available phosphorus,and available potassium decreased by 0.53%,16.19%,and 8.23%,respectively,while the soil alkaline nitrogen content increased by an average of 33.62%.Nitrogen fertilizer had a surplus.There was no significant difference in soil organic matter content between rapeseed and non-seed rape after wheat harvest,and the contents of soil alkaline nitrogen and available potassium decreased compared with post-wheat leisure,and soil available phosphorus was significantly reduced.2.The whole planting of rapeseed is better than that of stubble cultivating and cultivating soil.The soil organic matter content of the stubble and whole plant overturning treatments increased by 0.8%and 1.02%respectively compared with the control treatment;the contents of soil alkaline nitrogen,available phosphorus,and available potassium in the whole plant overturning treatment were significantly higher than that of the control treatment,with an increase of 8.75%,12.15%and 6.13%,significantly higher than the 4.11%,4.64%and 4.09%of the stubble overturning treatment.3.Combined application of organic and inorganic fertilizers can significantly increase the biomass of double-seed rape and soil organic matter,nitrogen and phosphorus effective nutrient content.The yield of rapeseed with fertilization increased by 12.86%～29.94%compared with the treatment without fertilization.The effect of combined application of urea and sheep dung was the best;the increase of soil organic matter,alkali nitrogen and available phosphorus content were 0.72%～1.78%,17.36%～29.61%and 13.98%～30.62%.4.Turning rapeseed after cropping into green manure can increase the soil fertility level and the yield of subsequent crops.After 3 years of continuous rolling of green manure rape,the measurement results show that,compared with the control,the increase in soil organic matter,alkaline nitrogen,available phosphorus,and available potassium are 3.85%～16.55%,5.05%～24.51%,-1.84%～24.68%,8.35,respectively.%～65.62%.At the same time,soil pH and bulk density decreased by 0.35%to 2.13%and 1.48%to 9.63%,respectively,while the increase in soil porosity was 0.61%to 4.91%.In addition,the increase in the number of soil microorganisms and enzyme activities were 7.23%～118.18%and 0.69%～96.05%,respectively.The average yield increase of spring wheat grain is about 5%.The amount of green manure pressure was positively correlated with soil nutrient content and wheat yield.5.Planting wheat and rape will consume soil organic matter and nitrogen,phosphorus and potassium effective nutrients in varying degrees.Rape whole plant chopping and pressing can significantly increase the soil available nitrogen,phosphorus and potassium nutrients,fertilization can significantly increase the yield of rape,and the effect of soil fertilization depends on the amount of green manure.This study did not intervene in the fertilization of wheat during the growth period If the combination of green manure pressure reduction and wheat season chemical fertilizer reduction application can be combined to determine the best green manure pressure reduction and chemical fertilizer reduction application,it will be more beneficial to fertilize the soil And fertilizer reduction.