Effects Of Nitrogen And Phosphorus Amounts On Yield And Quality Of Rear-seed Rapeseed

The long-term wheat monoculture in the northern mature area and the instability of the multiple cropping pattern in recent years have resulted in a decline in the fertility of the cultivated land in some areas,resulting in low economic returns and reduced farmers' income.In response to this phenomenon,a high-quality hybrid rapeseed variety "Huayouza 62" was used as a test material.After cultivating irrigated land,wheat was used as a seedbed for rapeseed research.Nitrogen and phosphorus fertilizers were used as factors to carry out field experiments,and wheat seedlings were replanted in wheat.Agronomic traits,N,P,K nutrient uptake,dry matter accumulation,crude protein,crude fat,crude ash content,acid detergent fiber content,neutral detergent fiber content,nitrogen-free extract content,etc.,were determined during the growth period.Quality and harvesting of fresh crops of feed rapeseed.By comparing the trends of agronomic traits,dry matter accumulation,and nutrient uptake during different growth periods of feed rape under nitrogen and phosphate fertilizer application rates,the effects of nitrogen and phosphate fertilizers on the yield and quality of feed rape were ascertained.It is of great significance to guide the fertilization of wheat rear-feed rapeseeds,increase fresh grass production,and increase economic efficiency.The main test results are as follows:1.Effects of different amounts of nitrogen and phosphate fertilizers on agronomic traits(plant height,stem diameter)and growth and development of feed rape during the whole growth period.Within a certain range of application,adding nitrogen fertilizer can significantly improve and increase the plant height and stem diameter of rapeseed,and has a positive correlation with the growth and development of plant height stem diameter.Appropriate application of nitrogen and phosphate fertilizer is beneficial to improve and improve the feed rapeseed agronomics.Characters,excessive nitrogen and phosphorus fertilizers will inhibit the growth and development of plants and reduce the utilization of fertilizers.In this experiment,the N2P2 fertilizer treatment was the most beneficial to improve and enhance the plant height(95.11cm)and stem diameter(17.79mm)of the rapeseed.2.The characteristics of dry matter accumulation in rape seedlings after wheat under nitrogen and phosphorus fertilizers.The mathematical equations were fitted to the dynamic changes of plant dry matter accumulation during the growth period of the rapeseed.The results showed that the dynamic changes of dry matter accumulation under different fertilizer treatments were consistent with the logistic growth curve model.Different nitrogen and phosphate fertilizer use rates could be advanced or Postponed the beginning,peak and end of dry matter accumulation of feed rapeseed.In this experiment,N2P2 fertilizer treatment is most beneficial to increase the dry matter accumulation rate(1.22g/d)and dry matter accumulation(29.84g/plant)of rapeseed,and excessive application of N and P fertilizers will reduce the dry matter of feed rapeseed.Cumulative rate and accumulation of dry matter.The nutrient uptake of N,P and K in various organs of rape seedlings after wheat under nitrogen and phosphate fertilizers.Application of nitrogen and phosphate fertilizer can significantly increase the nutrient content in the organs of feed rape.In this experiment,N2P2 treatment is most conducive to the absorption of nitrogen nutrition by feed rape.The contents of total nitrogen in all organs of the rapeseed from the seedling stage to the flowering stage were leaves>stalk>roots,and the total potassium content was stem>leaf>roots;the total phosphorus content in the roots of rapeseed was the highest at the seedling stage,and the leaves were the highest at the bud stage.The total phosphorus content in stems increased,and the total phosphorus content in roots decreased.The N,P and K nutrient uptake of organs in various parts of feed oilseeds constantly changes with the application of different nitrogen and phosphate fertilizers and the progress of rapeseed growth process.4.Effects of nitrogen and phosphate fertilizers on nutritional quality of wheat reared rape seedlings.The quality indicators of feed rape vary with the amount of fertilizer applied.Within a certain range of dosage,increasing N and P fertilizers can increase crude protein content(13.31%)and medium and acidic detergent fiber content of feed rape,and reduce the crude ash content of feed rape(9.71%-10.65%);excess amount of nitrogen and phosphate fertilizers It will reduce crude protein content,crude fat content,and intermediate and acidic detergent fiber content of feed rapeseed.The nitrogen-free extract content of rapeseed under different fertilization rates ranged from 47.88%to 54.00%,which was in line with the quality standard of high-quality forage.5.Effects of nitrogen and phosphate fertilizers on the yield of rape seedlings after wheat rearing.Through regression analysis,the appropriate N and P fertilizer application can significantly increase the yield of feed rape.In the nitrogen application test group,when the N application rate was 143.88 kg/hm2,the highest yield of feed rape was 95.97t/hm2;In the test group,when the phosphorus application rate was 109.46kg/hm2,the highest yield of feed rape was 99.13t/hm2.Considering factors such as yield,quality,and economic efficiency,the best economic benefit of rapeseeds for reared wheat seedlings was 135.52 kg/hm2,and the yield of feed rape was 95.32 t/hm2.The best economic benefit was 71.86kg/hm2 for phosphorus and 97.29t/hm2 for rapeseed.