红壤旱耕地速效磷测定方法与指标的研究
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STUDIES ON THE METHODS OF EXTRACTION OF AVAILABLE PHOSPHOROUS IN THE CULTIVATED UPLAND RED EARTHS
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    摘要:

    本文以二年多田间试验(玉米)与一年32P同位素标记肥料盆栽试验(小麦),先后证明对红壤旱耕地的速效磷提取法,酸性提取优于碱性提取。为了进一步证实上述试验结果,继续采用4种方法来确定红壤旱耕地速效磷的主要形态:(1)各级形态磷与3个参比标准之间的统计分析;(2)各级形态磷与10种提取方法结果之间的统计分析;(3)小麦盆栽后的土壤与空白土壤各级形态磷的差减;(4)同位素32P平衡法与土壤磷分级分析相结合。四种方法的研究结果一致证明,红壤旱耕地的速效磷主要形态是Al-P而不是Fe-P;从而说明了酸性提取优于碱性提取的原因。因为Al-P是一种两性化合物,新沉淀的Al-P酸溶性较大,而Fe-P只可能碱溶。Mehlich,Ⅲ法是一种不分土壤类型与地区的通用提取剂,本试验的结果证明其同样适用于红壤旱耕地。本文最后推荐Brayl法与Mehlich Ⅲ法为红壤旱耕地上的速效磷提取剂,并针对玉米作物确定相应的磷养分丰缺指标。

    Abstract:

    The results of two years field experiments with corn on cultiveted upland red earths in Zhejiang had showed that the extraction of available P with acidic extractants was better than that with alkaline extractants. In oder to farther prove this conclusion, four different experiments were conducted: (1) fractionation of soil P associated with statistical calculation, (2) determination of correlation coefficients between different forms of P and the results of different extraction methods, (3) calculation of the difference of Al-P, Fe-P and Ca-P of three soils before and after glowing a season of wheat, (4) isotopic dilution method of Dumbar and Baker. Results of the experiments showed that the principal form of available P in cultivated upland red earths is Al-P. Due to the acid soluble property of active solid Al-P, acid extractants are more satisfactory and reasonable. In this paper, the authors recommend Bray I and Mehlich Ⅲ as the most, convineant extractants for available P in cultivated upLlnd red earths in Zhejiang. Calibration scale of these two methods and critical values of P in soil for corn by five method are given in this paper.

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陆允甫,周鸣铮.红壤旱耕地速效磷测定方法与指标的研究[J].土壤学报,1987,24(4):325-334. Lu Yunfu, Zhou Mingzheng. STUDIES ON THE METHODS OF EXTRACTION OF AVAILABLE PHOSPHOROUS IN THE CULTIVATED UPLAND RED EARTHS[J]. Acta Pedologica Sinica,1987,24(4):325-334.

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  • 在线发布日期: 2013-02-25
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