以6个饲草型豆科品种为研究对象,通过对植株生长指标、饲草产量及养分含量、土壤养分含量的观测,分析比较了不同品种饲草产量与品质表现及对土壤的改良效果。结果表明,牡丹江秣食豆(Glycine max L.Merr.'Mudanjiang',MD)、鲁饲...以6个饲草型豆科品种为研究对象,通过对植株生长指标、饲草产量及养分含量、土壤养分含量的观测,分析比较了不同品种饲草产量与品质表现及对土壤的改良效果。结果表明,牡丹江秣食豆(Glycine max L.Merr.'Mudanjiang',MD)、鲁饲大豆2号(Glycine max'Lusi NO.2',LD2)和鲁饲大豆3号(Glycine max'Lusi NO.3',LD3)的株高和单株干重较大,干草产量显著高于其它参试品种(P<0.05)。同时,LD2和LD3的CP含量达到20.2%和20.1%,明显或显著高于除野生大豆(Glycine soja Sieb.Et Zucc.,HWD)之外的其他3个品种(P<0.05)。表明LD2和LD3品种在试验条件下能实现高产优质的目标。试验结果同时显示,6个参试品种0~20 cm和20~40 cm土层有机质含量较对照提高了7.98%和25.57%,全氮提高了13.55%和25.72%。LD3提高土壤全氮和有机质效果最为显著,但其对速效磷和速效钾的消耗也更多。展开更多
Annual legumes have been shown to enhance the growth and phosphorus (P) uptake by following rotational crops. However, there is lack of information on the effect of perennial forage legumes included in rotation for a ...Annual legumes have been shown to enhance the growth and phosphorus (P) uptake by following rotational crops. However, there is lack of information on the effect of perennial forage legumes included in rotation for a short duration on yield and P uptake of crops like wheat (Triticum aestivum L.) and canola (Brassica napus L.) grown after the forage legume. A field study was conducted in four soil zones of Saskatchewan, Canada to assess: 1) the effect of two years of forage legume versus annual cereal, oilseed and grain legume on yield and P uptake of wheat and canola grown in the two subsequent years and 2) the effect of the complete four-year rotation on soil P dynamics and P balance. Four different crop sequences (alfalfa-alfalfa, red clover-red clover, barley-pea and barley-flax) employed over the first two years of crop rotation were compared as treatments followed by wheat and canola. Wheat grain yield was improved 32% - 60% by alfalfa (Medicago sativa L.) and red clover (Trifolium pretense L.) rotations at three of the four sites (P = 0.008, P = 0.001, P < 0.0001) compared to annual grains, while grain P uptake was enhanced 38% - 43% by red clover and alfalfa rotation at two sites (P = 0.013, P = 0.033). In the following year, positive yield benefits (55% - 64%) of having two years of alfalfa and red clover were observed at three sites. Four years of continuous cropping with a limited addition of fertilizer P resulted in a negative soil P balance and significant depletion of soil P fertility at all locations.展开更多
文摘Annual legumes have been shown to enhance the growth and phosphorus (P) uptake by following rotational crops. However, there is lack of information on the effect of perennial forage legumes included in rotation for a short duration on yield and P uptake of crops like wheat (Triticum aestivum L.) and canola (Brassica napus L.) grown after the forage legume. A field study was conducted in four soil zones of Saskatchewan, Canada to assess: 1) the effect of two years of forage legume versus annual cereal, oilseed and grain legume on yield and P uptake of wheat and canola grown in the two subsequent years and 2) the effect of the complete four-year rotation on soil P dynamics and P balance. Four different crop sequences (alfalfa-alfalfa, red clover-red clover, barley-pea and barley-flax) employed over the first two years of crop rotation were compared as treatments followed by wheat and canola. Wheat grain yield was improved 32% - 60% by alfalfa (Medicago sativa L.) and red clover (Trifolium pretense L.) rotations at three of the four sites (P = 0.008, P = 0.001, P < 0.0001) compared to annual grains, while grain P uptake was enhanced 38% - 43% by red clover and alfalfa rotation at two sites (P = 0.013, P = 0.033). In the following year, positive yield benefits (55% - 64%) of having two years of alfalfa and red clover were observed at three sites. Four years of continuous cropping with a limited addition of fertilizer P resulted in a negative soil P balance and significant depletion of soil P fertility at all locations.
