关键词: 加工番茄, 缓释尿素, 产量, 氮肥利用率

Abstract: In order to clarify the best application amount of nitrogen fertilizer and matching effects of controlled release urea with common urea, this paper studied the effects of different nitrogen treatments on yield, quality and nitrogen use efficiency of processing tomato and soil nitrogen content at Hetao Irrigation District. The results showed that compared with the non fertilization, after applying nitrogen fertilizer the yield of fruit increased averagely by 99.7% and soluble solids increased by 0.34%~1.34%. The nitrogen utilization rate of applying slow-release urea was even higher. 100% recommended N application in slow-release urea or slow-release urea combined with common urea, the nitrogen utilization rate was 15.2%~20.2% higher than that of single application of urea nitrgen fertilizer. 80% recommended N application by slow-release urea or combined with common urea, the nitrogen utilization rate was 20.3%~21.8% higher than that of single application of urea nitrgen fertilizer. Applying slow-release urea or slow-release urea combined with normal urea could reduce the amount of nitrogen by 20%. By this way, the yield of processing tomato was significantly improved, and utilization rate of fertilizer was also increased. Among all treatments, 100% recommended nitrogen fertilizer taking 60% slow-release as base fertilizer, 20% urea as top application during flowering stage, 20% urea as topdressing during fruit swelling period had the highest yield, best economic benefit, and highest utilization rate of nitrogen fertilizer. There was no nitrogen residual in 20~40 cm surface soil and no nitrogen leaching loss in 20~40 cm soil.

Key words: processing tomato, controlled release , urea, yield, nitrogen utilization