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采用土壤培养试验和玉米盆栽试验,对比研究了普通尿素(U)、腐植酸尿素(UHA)和添加脲酶抑制剂的尿素(U+NBPT)对土壤氨挥发和玉米生长的影响。结果表明:U、UHA和U+NBPT处理的氨挥发累积量占施氮总量的比例依次是0.565%、0.375%和0.091%;其中UHA处理与U相比,降低氨挥发累积量33.5%,U+NBPT处理与U和UHA相比分别降低氨挥发总量84.0%和75.9%。施用腐植酸尿素促进了盆栽玉米的生长,与普通尿素相比,玉米棒干物重增加33.9%,吸氮量增加24.0%,氮肥利用率增加7.4个百分点。腐植酸尿素降低了土壤氨挥发,有效促进了玉米氮素吸收,增加了氮肥利用率,因而有较大的应用潜力。
The effects of urea (U), humic acid urea (UHA) and urease inhibitor urea (U + NBPT) on soil ammonia volatilization and maize growth were compared using soil culture experiments and corn pot experiments. The results showed that the proportion of ammonia volatilization accumulated by U, UHA and U + NBPT accounted for 0.565%, 0.375% and 0.091% of the total amount of nitrogen application respectively. Among them, UHA treatment reduced the accumulation of ammonia volatilization by 33.5% U + NBPT treatment reduced the total ammonia volatilization by 84.0% and 75.9%, respectively, compared with U and UHA. The application of humic acid urea promoted the growth of potted maize. Compared with common urea, the dry weight of maize cob increased by 33.9%, the nitrogen uptake increased by 24.0% and the nitrogen utilization increased by 7.4%. Humic acid urea reduces soil ammonia volatilization, which effectively promotes the nitrogen absorption of maize and increases the utilization rate of nitrogen fertilizer. Therefore, humic acid urea has great potential for application.