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>Reducing Nitrogen Leaching from Agriculture: An Essential Step toward Protecting the Environment in High Rainfall Areas of Taiwan
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Reducing Nitrogen Leaching from Agriculture: An Essential Step toward Protecting the Environment in High Rainfall Areas of Taiwan
Reducing nitrogen (N) leaching from croplands is important to protect environmental quality and improve recovery of applied N. To contribute to this broader goal of nutrient management, a simple pot experiment evaluated the potential differences among urea (250 kg N ha(-1)), urea+compost (125 kg N ha(-1) from urea + 125 kg N from 8 Mg ha(-1) of compost), compost (250 kg N from 16 Mg ha-1 of compost) and a zero control (Ctrl), in terms of their effects on apparent N recovery (ANR), mineral N (N-min) leaching and soil retention of applied N. Cabbage (Brassica oleraceae L.) and corn (Zea mays L.) were grown in rotation where compost application was not repeated in the 2nd year. N-min leaching was monitored by adding 83 mm and 62 mm of water fortnightly to cabbage and corn crops, respectively for a total of 28 times in a two-year period. Combined (urea+compost) and independent (compost) treatment application retained 1.5 to 2 times higher N, and lowered 2.1 to 4.6 times N-min leaching, relative to independent (urea) application. We conclude that farmers' practice of fertilization that has an inherent problem of N leaching for high rainfall areas in Taiwan could be improved by proper compost and urea combinations within agronomically recommended rates of N application.
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机译:减少农田浸出的氮气(n)浸出是保护环境质量的重要性,改善应用N的恢复。有助于营养管理的更广泛的目标,简单的盆栽实验评估了尿素的潜在差异(250公斤(-1) ),尿素+堆肥(125kg n ha(-1)来自尿素+ 125 kg n,从8 mg ha(-1)堆肥),堆肥(从16 mg ha-1的堆肥250kg n)和零控制(Ctrl),在它们对明显的N恢复(ANR)的影响方面,矿物N(N-MIN)浸出和土壤保留的涂抹的N.卷心菜(Brassica Oleraceae L.)和玉米(Zea mays L.)的浸入和土壤保留旋转堆效申请在第2年内未重复。通过分别向白菜和玉米作物加入83毫米和62毫米的水分,在两年内分别加入83毫米和62毫米的水分来监测N-MIN浸出。合并(尿素+堆肥)和独立(堆肥)治疗申请保留了1.5至2倍的N,相对于独立(尿素)应用,降低了2.1至4.6倍的N-min浸出。我们得出结论,通过在农艺推荐的N申请的经济推荐率下,通过适当的堆肥和尿素组合,农民对台湾的高降雨地区N浸出的施肥的固有问题的实践。
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