Nitrogen and Phosphorus Changes in Soil and Soil Water after Cultivation
Nitrogen and Phosphorus Changes in Soil and Soil Water after Cultivation
复制标题
耕作后土壤及土壤水氮磷变化
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
D. Nash
中科院分区：
文献类型：
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作者：
M. Watkins;H. Castlehouse;M. Hannah;D. Nash
未耕作的奶牛牧场比常规耕作的牧场有可能向环境释放更多的磷。在本文中，我们报告的初步研究结果比较的影响，种植，磷（P）肥料（10，35，100公斤P/公顷），和两种类型的植被（黑麦草（多年生黑麦草）或黑麦草混合三叶草（白三叶））在一个随机的完全区组设计。从0-20 mm和0-100 mm深度的土壤样品中测量磷。还分析了从0-20 mm样品中提取的沃茨。在所有情况下，P浓度（Olsen P，科尔韦尔P，全P，CaCl 2提取P，溶解活性P，和总溶解P）在顶部20毫米下降与犁。溶解活性磷测定在土壤水是70%，整体少翻耕地块相比，未翻耕地块，并通过35周后，磷处理溶解活性磷减少66%。肥料和牧草处理的效果尚不确定。这些数据表明，翻耕可以降低试验区集约化奶牛场磷输出的风险。
Untilled dairy pasture has the potential to release more phosphorus to the environment than a regularly ploughed pasture. In this paper we report the initial results of a study comparing the effects of cultivation, phosphorus (P) fertiliser (10, 35, and 100 kg P/ha), and two types of vegetation (ryegrass (Lolium perenne) or ryegrass mixed with clover (Trifolium repens)) in a randomised complete block design. Phosphorus was measured in soil samples taken from depths of 0–20 mm and 0–100 mm. Waters extracted from the 0–20 mm samples were also analysed. In all cases, the P concentrations (Olsen P, Colwell P, Total P, CaCl2 extractable P, Dissolved Reactive P, and Total Dissolved P) in the top 20 mm declined with ploughing. Dissolved Reactive P measured in the soil water was 70% less overall in the ploughed plots compared with the unploughed plots, and by 35 weeks after P treatments the decrease in Dissolved Reactive P was 66%. The effects of the fertiliser and pasture treatments were inconclusive. The data suggest that ploughing can lower the risk of P exports from intensive dairy farms in the trial area.