A Long Term Experiment on Soil Fertility and Cotton Yield in Tanzania
A Long Term Experiment on Soil Fertility and Cotton Yield in Tanzania
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坦桑尼亚土壤肥力和棉花产量的长期试验
DOI：
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发表时间：
1972
影响因子：
1.6
通讯作者：
P. H. Mare
中科院分区：
文献类型：
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作者：
P. H. Mare
摘要 堆肥或硫酸铵提高并维持了棉花产量 6 年，但两者与重过磷酸钙一起需要维持 9 年，此后产量下降，需要使用石灰。堆肥提供了必需但不足的磷、钾、钙和氮。当在酸性土壤上使用氯化钾时，锰的毒性会很严重。在合适的土壤 pH 值和充足的磷和阳离子下，对氮的反应很大，但为了使其最有效，钙似乎有必要维持阳离子：阴离子的比例。没有石灰，产量会因大雨而下降；有了它，它们在最潮湿的季节是最大的。
SUMMARY Compost or ammonium sulphate improved and maintained cotton yield for 6 years but both, together with triple superphosphate, were needed to maintain it for 9 years, after which yield declined and lime was necessary. Compost supplied necessary but insufficient phosphorus, potassium, calcium and nitrogen. Manganese toxicity was severe when potassium chloride was used on very acid soil. At suitable soil pH and with adequate phosphorus and cations, response to nitrogen was large, but for it to be most effective, calcium seemed necessary to maintain the cation: anion ratio. Without lime, yields declined with heavy rain; with it they were largest in the wettest seasons.