Study On Nitrogen Loss Rate Of Hetao Irrigation Area Under Different Fertilization System

The excessive use of nitrogen fertilizer today not only causes the loss of nitrogen to increase the production cost but also damage the environment so that agricultural non-point source pollution is becoming more and more serious.So the rational use of nitrogen fertilizer has become the focus of attention.The field experiment was carried out to study the loss of gaseous nitrogen in different fertilization systems.The results showed that:1.The nitrogen uptake of maize was 141.4kg/hm2 and 43.7%higher than that of other treatments.The loss of ammonia was 13.5kg/hm2,the loss of N20 was 1.8kg/hm2,the loss of gaseous nitrogen was 4.8%less than the topdressing urea,topdressing urea,soil leaching water nitrogen leaching loss of 29.4kg/hm2,less than slow-release nitrogen fertilizer,topdressing urea,topdressing secondary urea and topdressing twice Liquid nitrogen fertilizer.The nitrogen content of top soil urea was 106.8 kg/hm2.The yield of maize was significantly higher than that of slow release nitrogen fertilizer,followed by urea and topdressing urea(p<0.05).2.The nitrogen use efficiency of topdressing liquid nitrogen fertilizer was 41.8%higher than that of slow release nitrogen fertilizer,topdressing urea and topdressing urea,and the loss of nitrogen was 4.9%higher than that of slow release nitrogen fertilizer Three times the average urea nitrogen 4.8%,leaching loss of soil leaching nitrogen content of 31.4kg/hm2,leaching loss rate is lower than the top three ordinary urea but higher than the slow release of nitrogen fertilizer,topdressing urea and topdressing.secondary urea The The yield of maize was also significantly higher than that of slow-release nitrogen fertilizer(P<0.05),and the yield of maize was not significant(p<0.05).3.The nitrogen use efficiency of slow-release nitrogen fertilizer(35.8%),topdressing urea(38.1%)and topdressing urea(37.5%)was lower than that of normal urea(43.7%)and topdressing Nitrogen fertilizer(41.8%).(42.6 kg/hm2),topdressing urea(47.2 kg/hm2)and topdressing urea(38.8 kg/hm2)were higher than those of formula fertilizer +topdressing urea 29.4 kg/hm2)and the formula fertilizer + topdressing liquid nitrogen fertilizer(15.7 kg/hm2)did not have a great advantage in maize yield and environmental effects.