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Nitrate leaching from forage legume crops and residual effect on Italian ryegrass

机译：从饲料豆类作物和意大利黑麦草的残留效果浸出硝酸盐

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Forage legumes can improve the N-efficiency of crop systems but also increase environmental pollution. This research investigated the NO3-N leached during the growth cycle of four forage legume crops and of barley and evaluated their residual effect on yield, N uptake and nitrate leaching of Italian ryegrass. For all crops, the nitrate leaching losses concentrated in the four months after seeding and accounted for over 78% of total N leached. On a yearly basis, nitrate leaching from legumes increased with the decrease in crop cycle length from 18 (alfalfa) to 47 kg N ha(-1) (field bean). All legumes had a significant residual effect on forage and N yield of Italian ryegrass. In terms of both forage yield and nitrogen content, the beneficial effects of preceding legume crops ranked in the order: alfalfa > red clover = sulla > field bean, and was higher for N content than for dry matter.
机译：饲料豆类可以提高作物系统的核效率，但也增加了环境污染。 本研究研究了在四个饲料豆类作物和大麦的生长周期中浸出的NO3-N浸出，并评估了意大利黑麦草的剩余效果，N抗氮酸盐浸出。 对于所有作物，硝酸盐浸出损失在播种后的四个月内浓缩，占总浸出的78％以上。 每年在每年的基础上，从18（苜蓿）到47kg N ha（-1）的作物循环长度的减少增加，硝酸浸出随着作物循环长度的减少而增加（-1）（田豆）。 所有豆类对意大利黑麦草的饲料和氮素产量具有显着的残余影响。 就饲料产量和氮含量而言，豆科作物的有益效果按顺序排名：苜蓿>红三叶草= Sulla>田间豆，并且N含量高于干物质。

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