Study On The Synergistic Effect Of Slow-release Nitrogen Fertilizer And Biological Organic Fertilizer On Oats

Aline-alkali stress affects the normal absorption and utilization of nitrogen nutrients by oats.In order to explore the effect of slow-release nitrogen fertilizer applied in one-time application of bio-organic fertilizer on oats in saline-alkali land.The experiment used Pi oat Meng Yan No.1 as the material and the field test method in the Inner Mongolia Tumochuan saline-alkali field.The slow-release nitrogen fertilizer and the bio-organic fertilizer were combined to apply 6 treatments(CK is no fertilizer;T1:single slow-release nitrogen fertilizer;T2:75%slow-release nitrogen fertilizer+25%bio-organic fertilizer;T3:50%slow-release nitrogen fertilizer+50%bio-organic fertilizer;T4:25%slow-release nitrogen fertilizer+75%bio-organic fertilizer;T5:single application of bio-organic fertilizer).From a comprehensive analysis of the agronomic traits,photosynthetic performance,and the dynamic spatiotemporal changes of nitrogen,phosphorus,and potassium nutrient content of oats in different periods,the following main research results are obtained:1.Single slow-release nitrogen fertilizer treated oat plants have the highest nitrogen content and low nitrogen utilization rate.50%slow-release nitrogen fertilizer+50%bio-organic fertilizer treated oat plants have a middle nitrogen content and high nitrogen utilization rate.The translocation rate of phosphorus and potassium in oat plants treated with 50%slow-release nitrogen fertilizer+50%bio-organic fertilizer was high.The K+/Na+ratio of the oat plants treated with 50%slow-release nitrogen fertilizer+50%bio-organic fertilizer was the highest,indicating that the combined application of slow-release nitrogen fertilizer and bio-organic fertilizer had a certain effect on adjusting the resistance of oats to salt stress.Comprehensive analysis shows that 50%slow-release nitrogen fertilizer+50%bio-organic fertilizer treatment has higher nutrient utilization efficiency and the ability to regulate saline-alkali stress.2.The net photosynthetic rate and transpiration rate of 50%slow-release nitrogen fertilizer+50%bio-organic fertilizer treated oats were the highest during the whole growth period.After the booting stage,the intercellular CO2 concentration decreased,which was lower than that of no fertilizer.It showed that 50%slow-release nitrogen fertilizer+50%bio-organic fertilizer treatment was less affected by saline-alkali stress after booting stage than oat plants of other treatments.3.single application of bio-organic fertilizer treated oat crude fat,crude protein,acid washing fiber and neutral washing fiber all performed well.It shows that bio-organic fertilizer can help improve crop quality.In terms of oat yield,quality,nutrient use efficiency and soil nutrient content changes,the slow-release nitrogen fertilizer combined with the application of bio-organic fertilizer(T2?T4)are superior to the single-application full-release slow-release nitrogen fertilizer(T1)and the single-application bio-organic fertilizer(T5)treatment,T3 treatment(50%slow-release nitrogen fertilizer +50%bio-organic fertilizer)in the absence of significant yield reduction,nitrogen fertilizer utilization rate increased 21.61%?84.18%compared to the application of slow-release nitrogen fertilizer treatment.It shows that the application of bio-organic fertilizer under nitrogen-reducing conditions can improve the efficiency of crop nutrient utilization and stress tolerance.The optimal ratio of fertilization with T3 treatment,that is,50%slow-release nitrogen fertilizer+50%bio-organic fertilizer treatment,has the best nitrogen reduction and synergistic effect.