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首页> 外文期刊>Communications in Soil Science and Plant Analysis >Roller-crimper termination for legume cover crops in North Carolina: impacts on nutrient availability to a succeeding corn crop.
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Roller-crimper termination for legume cover crops in North Carolina: impacts on nutrient availability to a succeeding corn crop.

机译:北卡罗莱纳州豆类作物的压路机终接:对随后的玉米作物养分供应的影响。

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摘要

Nitrogen (N) release from roll-killed legume cover crops was determined for hairy vetch (Vicia villosa Roth), crimson clover (Trifolium incarnatum L.), and a hairy vetch+rye (Secale cereale L.) biculture in an organic corn production system in North Carolina, USA. Cover crops were planted at two locations in fall 2008 and 2009, roll-killed in May, and no-till planted with corn (Zea mays L.). Inorganic soil N and mineral N flux were determined using potassium chloride (KCl) extractions and ion-exchange resin (Plant Root Simulator, PRS) probes at 2-week intervals for 12 weeks and compared to fertilized controls of 0 and 168 kg N ha-1. In 2009, greater plant available N under hairy vetch than under either 0 N control or crimson clover was found, with peak soil N occurring between 4 and 6 weeks after roll kill. Available soil N under crimson clover mulches was less than or equal to 0 N, suggesting net immobilization.
机译:确定了用于有机玉米生产中的有毛v子(Vicia villosa Roth),深红三叶草(Trifolium incarnatum L.)和有毛v子+黑麦(Secale graine L.)的双菌种,测定了辊杀干的豆类覆盖作物释放的氮(N)。美国北卡罗来纳州的系统。在2008年和2009年秋季,在两个地点种植了覆被作物,并于5月进行了杀害,并在玉米上进行了免耕种植(Zea mays L.)。使用氯化钾(KCl)提取物和离子交换树脂(Plant Root Simulator,PRS)探针以2周为间隔12周测定无机土壤氮和矿质氮通量,并与0和168 kg N ha的受精对照进行比较sup> -1 。 2009年,发现多毛紫菜下的植物可用氮大于0 N对照或深红三叶草,在杀害玉米后4至6周,土壤氮素峰值出现。深红色三叶草覆盖物下的有效土壤氮小于或等于0 N,表明净固定化。

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