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Phosphorus status, inorganic phosphorus forms, and other physicochemical properties of acid soils of Farta District, Northwestern Highlands of Ethiopia

机译：埃塞俄比亚西北高地法塔区酸性土壤的磷状况，无机磷形态和其他理化特性

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摘要

Soil acidity and low availability of P limit crop production in the highlands of Ethiopia. The objective of this study was to determine the P status, distribution and forms of inorganic P and relate them to selected chemical properties of eight representative acidic surface soil samples from Farta District. Soil pH (H2O) varied between 4.74 and 5.50. The moderate to high CEC suggests that besides kaolinite, the soils also contain expandable 2 : 1 clay minerals. Though the total P content was high, the available Olsen P content was very low or low in all soils except one. In most soils, the abundance of inorganic P fractions was as follows: P bound by oxalate extractable iron (-P) reductant soluble Fe-P occluded Al-Fe-P P bound by oxalate extractable aluminum (-P) calcium bound P (Ca-P). Olsen P had a very strong positive correlation () with -P (), -P (), and oxalate extractable P (). Though Fe bound P reserves were quite abundant and the degree of P saturation of + (median 3.3%) was moderate, the extremely low P saturation of (median 0.5%) explains the P deficiency of the soils.
机译：土壤酸度和磷的低利用率限制了埃塞俄比亚高地的作物产量。这项研究的目的是确定无机磷的磷状态，分布和形式，并将其与来自法塔区的八个代表性酸性表层土壤样品的选定化学性质相关。土壤pH（H2O）在4.74和5.50之间变化。 CEC值从中到高表明，除高岭石外，土壤还含有可膨胀的2：1粘土矿物。尽管总磷含量很高，但除一种土壤外，所有土壤中有效的磷含量都很低。在大多数土壤中，无机P组分的含量如下：草酸盐可萃取铁（-P）还原剂结合的P可溶性Fe-P吸附的Al-Fe-P草酸盐可萃取铝（-P）钙结合的P（Ca -P）。 Olsen P与-P（），-P（）和草酸盐可萃取P（）有非常强的正相关性。尽管Fe结合的P储量非常丰富，并且P的饱和度为+（中值3.3％）适中，但极低的P饱和度（中值0.5％）说明了土壤中的P缺乏。

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