Assessing the effectiveness of manure export plus intensive silage cropping for lowering the Olsen‐P status of P‐enriched grassland
Assessing the effectiveness of manure export plus intensive silage cropping for lowering the Olsen‐P status of P‐enriched grassland
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评估粪便输出加集约青贮种植对降低富磷草地奥尔森磷状况的有效性
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发表时间：
2015
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通讯作者：
J. Bailey
中科院分区：
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作者：
J. Bailey
在北方爱尔兰（NI）的耕地草原土壤中，有相当大的比例是过度富集磷，并对水质构成风险。为了解决这个问题，粪便可以出口，而不是回收到富磷的土地，后者密集种植草青贮饲料，以消耗土壤P.为了评估这种策略的有效性，一个P和K丰富的草地网站密集种植超过6年的时间，仅提供肥料N，以支持青贮饲料的生长。到第6年，土壤磷已从指数5下降到指数3，据估计，再进行两年的这种管理可能会使其进入目标指数2范围。土壤钾，但是，迅速下降，从指数4指数1，在短短4年，结果，草生产成为限制钾缺乏。结果表明，在青贮管理下，不将粪便循环到富磷草地可能是降低土壤磷状况的最有效策略，但必须注意防止缺钾的发生。
A substantial proportion of farmed grassland soils in Northern Ireland (NI) are overly enriched with P and pose a risk to water quality. To address this problem, manure could be exported rather than recycled to P‐enriched land and the latter intensively cropped with grass silage to deplete soil P. To assess the efficacy of such a strategy, a P‐ and K‐enriched grassland site was intensively cropped over a 6‐yr period with fertilizer N alone supplied to support silage growth. By year 6, soil P had declined from index 5 to index 3, and it was estimated that two more years of this management may bring it into the target index 2 range. Soil K, however, declined rapidly from index 4 to index 1 in just 4 yr, with the result that grass production became limited by K deficiency. It was concluded that nonrecycling of manure to P‐enriched grassland under silage management is probably the most effective strategy for lowering soil P status, but care must be taken to prevent K deficiency occurring.