PHOSPHATE AVAILABILITY IN TROPICAL SOILS AS RELATED TO PHOSPHORUS FRACTIONS AND CHEMICAL-TESTS
PHOSPHATE AVAILABILITY IN TROPICAL SOILS AS RELATED TO PHOSPHORUS FRACTIONS AND CHEMICAL-TESTS
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DOI：
10.1080/00103629409369160
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发表时间：
1994-01-01
影响因子：
1.8
通讯作者：
CAJUSTE, L
中科院分区：
文献类型：
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作者：
CAJUSTE, LJ;LAIRD, RJ;CAJUSTE, L
通过室内和温室试验，研究了热带土壤磷素形态、土壤磷素性质和磷素生物有效性之间的关系。在这两项研究中，土壤样品进行了平衡与两个水平的碳酸钙和三个P在两个孵化期。采用连续分级法提取无机磷组分（Pi）树脂-P、Bic-P、NaOH-P I和II、HCl-P、H_2SO_4-H_2O_2-P。在温室实验中进行了评估。结果表明，Pi的含量根据石灰、P的水平和孵育时间的不同而变化很大。树脂-P和Bic-P，最丰富的磷，与干物质重和植物吸收的P，无论培养间隔高度相关。Bray P-1与树脂P和Bic-P、Olsen-P与大多数P组分、Mehlich I-P与树脂P、Bic-P和残留P之间存在高度显著的相关性（P < 0.01），这可能是因为大多数化学提取剂具有选择性识别P组分的能力。植物生长参数和土壤测试之间的关系也进行了研究。
Laboratory and greenhouse experiments were conducted to study the relationships among phosphate (P) fractions, P soil tests, and P bioavailability of tropical soils. In both studies, soil samples were equilibrated with two levels of CaCO3 and three of P during two incubation periods. A sequential fractionation procedure was followed to extract inorganic P fractions (Pi) resin-P, Bic-P, NaOH-P I and II, HCl-P, H2SO4-H2O2-P. Dry matter and P uptake by maize (Zea mays L.) were evaluated in the greenhouse experiment. Results indicated that amounts of Pi varied widely according to levels of lime, P, and incubation time. Resin-P and Bic-P, the most abundant Pi, were highly correlated with dry matter weight and plant uptake of P regardless of incubation interval. Highly significant correlations (P < 0.01) were found for Bray P-1 versus resin-P and Bic-P, Olsen-P versus most P fractions, and Mehlich I-P versus resin P, Bic-P, and residual-P, probably because of the ability of most of these chemical extractants in identifying selectively P fractions. Relationships between plant growth parameters and soil tests were also examined.