The effect of soil Ph on olsen bicarbonate phosphate values
The effect of soil Ph on olsen bicarbonate phosphate values
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土壤Ph值对奥尔森磷酸氢盐值的影响
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
I. Cornforth
中科院分区：
文献类型：
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作者：
P. Sorn;R. Tillman;J. Syers;I. Cornforth
使用两个对比新西兰土壤：一个高P保持埃格蒙特土壤和一个低P保持能力的Tokomaru土壤的pH值的增加，石灰对奥尔森碳酸氢盐磷酸盐（P）测试值的影响进行了研究。培养后的三个利率的Ca（OH）2，土壤pH值增加，并观察到的Olsen P值的减少。32 P-交换性P的量，但是，随着土壤pH值的增加而增加，并有很小的变化，在水提取的P.石灰的加入没有显着的影响，无论是产量或吸收的P生长在相同的土壤在温室中的黑麦草。看来，在土壤中的Olsen P值下降后，石灰是一个人为的结果，在奥尔森程序。高浓度的Ca参与了石灰土中Olsen P值的降低。这表明石灰土Olsen提取物中磷酸钙的沉淀是导致Olsen P值降低的原因。在田间试验中，增加土壤pH值的石灰除了也导致在奥尔森P值的下降。
The effect of increases in soil pH by liming on Olsen bicarbonate phosphate (P) test values was investigated using two contrasting New Zealand soils: a highly P retentive Egmont soil and a Tokomaru soil with a low P retention capacity. After incubation with three rates of Ca(OH)2, soil pH was increased, and a reduction in the Olsen P values was observed. The amounts of 32P-exchangeable P, however, increased with increasing soil pH, and there was very little change in water-extractable P. The addition of lime had no significant effect on either the yield or uptake of P by ryegrass grown on the same soils in the glasshouse. It appears that the decline in Olsen P values in soils following liming is a result of an artefact in the Olsen procedure. High concentrations of Ca are involved in the decrease in Olsen P values in limed soils. It is suggested that the precipitation of calcium phosphates in the Olsen extracts of limed soils is responsible for the decrease in the Olsen P values. In a field experiment, increasing soil pH by lime addition also resulted in a decrease in the Olsen P values.