SOIL TESTING FOR PHOSPHORUS IN SOME NIGERIAN SOILS: I. COMPARISON OF METHODS OF DETERMINING AVAILABLE PHOSPHORUS IN SOILS OF SOUTHEASTERN NIGERIA
SOIL TESTING FOR PHOSPHORUS IN SOME NIGERIAN SOILS: I. COMPARISON OF METHODS OF DETERMINING AVAILABLE PHOSPHORUS IN SOILS OF SOUTHEASTERN NIGERIA
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尼日利亚部分土壤中磷的土壤测试： I. 尼日利亚东南部土壤中有效磷测定方法的比较
DOI：
10.1097/00010694-197701000-00006
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
W. O. Enwezor
中科院分区：
文献类型：
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作者：
W. O. Enwezor
本文比较了七种测定土壤有效磷的化学提取剂对磷的提取效果和提取磷预测土壤磷素肥力的精度。使用0.1 N氢氧化钠的强碱提取提取最多的磷，但在预测产率方面最不精确（r = 0.58）。氢氧化钠浸提液中有机磷的加入进一步降低了精密度（r = 0.56）。用稀酸和阴离子交换树脂提取得到最低值的有效磷，但树脂提取是上级稀酸提取预测的百分比产量，与0.72的相关系数为0.60和0.68，分别为0.002 N的硫酸和3%的乙酸相比，树脂提取。用0.5 M碳酸氢钠和0.03 N氟化铵加0.025 N盐酸提取同样精确地预测产率百分比，相关系数分别为0.67和0.68。0.03 N氟化铵+0.1 N盐酸提取的磷与产率的相关性最高（r = 0.74）。该方法简便、快速、有效，已被推荐用于尼日利亚东南部酸性土壤磷的常规土壤测试。
Seven chemical extractants for determining available soil phosphorus have been compared with respect to their effectiveness in extracting phosphorus and the precision of the extracted phosphorus in predicting the phosphorus fertility of the soils. Strong alkali extraction using 0.1 N sodium hydroxide extracted the most phosphorus but was the least precise in predicting yields (r = 0.58). Inclusion of organic phosphorus in the sodium hydroxide extract reduced the precision further (r = 0.56). Extraction with dilute acids and an anion exchange resin gave lowest values for available phosphorus but resin extraction was superior to dilute acid extraction in predicting percentage yields, with a correlation coefficient of 0.72 for resin extraction compared with 0.60 and 0.68, respectively, for 0.002 N sulfuric acid and 3 percent acetic acid. Extraction with 0.5 M sodium bicarbonate and 0.03 N ammonium fluoride plus 0.025 N hydrochloric acid were equally precise in predicting percentage yields with correlation coefficients of 0.67 and 0.68, respectively. The phosphorus extracted with 0.03 N ammonium fluoride plus 0.1 N hydrochloric acid gave the highest correlation with percentage yield (r = 0.74). This method, being additionally simple, quick, and effective ir extracting phosphorus, has been recommended for the routine soil testing for phosphorus in the acid soils of southeastern Nigeria.