摘要:
研究了福建黄泥田施用种肥、苗肥和接种根瘤菌及其组合对紫云英产量、有机C及养分吸收累积的影响。结果表明,施肥显著提高了的紫云英枝茎长度与根瘤数量,各施肥处理鲜草产量、干物质产量分别较CK增幅81.2%～162.6%,45.8%～101.1%,分别达极显著与显著增产水平;各施肥处理有机C累积量与养分累积量分别较CK增幅51.6%～99.4%与54.4%～105.3%。不同施肥模式以种肥(钙镁磷肥75kghm-2)+PK苗肥(钙镁磷肥375kghm-2+氯化钾90kghm-2)的紫云英鲜草产量、干物质产量、有机C累积量与养分累积量相对较高,分别较单施种肥处理提高42.1%、37.9%、31.5%、29.5%,也总体优于种肥+P苗肥处理。而在该处理结合接种根瘤菌的干物质产量与养分累积量未见提高。可见,在当前黄泥田肥力水平下,增施磷钾肥是提高紫云英产量与养分累积量的有效途径。
关键词:
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紫云英 /
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施肥 /
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产量 /
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养分累积 /
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根瘤菌
Abstract:
Effects of seed manure,seedling fertilization,rhizobia inoculation and their combinations on the yield,organic carbon,nutrient uptake/accumulation of milk vetch(Astragalus sinicus L.)were studied in yellow-clay paddy fields.The results indicated that the fertilization significantly increased the stalk length and amount of root nodules of the milk vetch as compared to the control.The fresh grass output was most significantly increased by 81.2%-162.6%,and the dry matters output significantly increased by 45.8%-101.1%.The organic carbon and nutrient accumulations increased ranging from 51.6%-99.4% and 54.4%-105.3%,respectively.The fertilization with the mixture of the seed manure(calcium magnesium phosphate 75 kgm-2)and PK seedling fertilizer(calcium magnesium phosphate 375 kgm-2+ potassium chloride 90 kgm-2)increased the fresh grass,dry matters,organic carbon and nutrient accumulations by 42.1%,37.9%,31.5% and 29.5%,respectively,as compared to the control.The mixture of the seed manure and P seedling fertilizer improved the results as well.On the other hand,rhizobia inoculation with the fertilization did not enhance the nutrient accumulation.It was found that increased phosphorus and potassium could effectively improve the yield and nutrient uptake/accumulation of the milk vetch in the current fertility level of yellow paddy field.
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