腐磷肥中有效磷测定方法的探讨
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THE DETERMINATION METHOD OF AVAILABLE PHOSPHORUS IN HUMATE-PHOSPHATE FERTILIZER
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    摘要:

    现用2%柠檬酸测定腐磷肥(指原煤粉与磷矿粉的混合物)中有效磷的方法,存在的问题比较大。特别是在提取过程中出现的负值现象,即原煤粉与磷矿粉混合后提取出的P2O5量,低于单独提取磷矿粉的P2O5量,迄今没有解决。

    Abstract:

    The available phosphorus waas extracted with 2% of citrie acid from 12 humate Phosphate fertilizer eomposed of different powdered coal* and rock phosphate.The result obtained showed that most of the extractable phosphorus of the samples was of negative value, while the lowest value was only equal to 14% of the P2O5 of powdered rock phosphate.The change of the negative value of the extractable phosphorus significantly correlated with the content of calcium and magnesium in powedered coal. The result also showed that the mechanism of the negative value is mainly due to the secondary retention induced by the calcium and magnesium ions of the powdered coal. Based on the results mentioned above, the phenomenon of negative value can be eliminated by using potassium sulfate or sodium fluoride to control the activities of Ca and Mg ions in the extraction system. In this paper a mixed extractant composed of 2% of citric acid-2% of sodium fluoride-7% of potassium sulfate which can control the activities of calcium, magnesium, iron and aluminium is proposed for the extraction of available phosphate from humate-phosphates. Pot experiment with rice and millet showed that the mixed extractant can basically eliminate the negative value of extractable phosphorus from samples, and the quantity extracted by the mixed extractant is well correlated with absorbed phosphorus by plants from the humate-phosphates as compared with the extraction of 2% citric acid. It is proved that the mixed extractant may be more practical for extraction of available phosphorus from humate-phosphates.

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蒋柏藩,顾益初,王振荣,段平楣.腐磷肥中有效磷测定方法的探讨[J].土壤学报,1980,17(1):69-78. Jiang-Bo-fan, Gu Yi-chu, Wang Zhen-rong, Duan Ping-mei. THE DETERMINATION METHOD OF AVAILABLE PHOSPHORUS IN HUMATE-PHOSPHATE FERTILIZER[J]. Acta Pedologica Sinica,1980,17(1):69-78.

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  • 在线发布日期: 2013-02-25
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