关键词: 尿素硝酸铵溶液, 玉米, 产量, 品质, 养分吸收

Abstract: This paper studied the effects of applying ammonium nitrate solution (UAN) in summer maize (Zea may L.) by taking a field experiment. The results showed that compared with urea, applying UAN at the same nitrogen amount could increase the yield of summer maize, which mainly attributed to the increase of kernels per ear. The yield of UAN treatment of 80% optimized nitrogen amount was decreased, but was still higher than urea treatment of optimized nitrogen amount. The output and net income of summer maize of UAN treatment at the same or 80% nitrogen amounts were higher than those of urea treatment, and the contents of crude protein and starch were also improved. Nitrogen uptake efficiency, nitrogen apparent recovery efficiency, nitrogen agronomic efficiency and nitrogen production efficiency were also higher than those of urea treatment. However, compared with urea, applying UAN at the same nitrogen amount had the likelihood of nitrate leaching, but the rate of nitrate leaching under UAN treatment at reducing nitrogen amount was decreased. Applying UAN at the same nitrogen amount could also raise water use efficiency of grain kernel and above ground part in summer maize, but those of the reducing application of UAN were decreased to varying degrees. In conclusion, the effect of applying UAN was better than that of urea in summer maize, according to comprehensive consideration of yield, economic benefit, nitrogen use efficiency and water use efficiency.

Key words: ammonium nitrate solution, maize (Zea may L.), yield, quality, nutrient uptake