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首页> 外文期刊>AIMS Agriculture and Food >Effects of incubation period and Christmas Island rock phosphate with different rate of rice straw compost on phosphorus availability in acid soil
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Effects of incubation period and Christmas Island rock phosphate with different rate of rice straw compost on phosphorus availability in acid soil

机译：稻草堆肥不同孵化期和圣诞岛磷矿对酸性土壤磷有效性的影响

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Phosphorus (P) availability is limited in tropical acid soil due to fixation of soluble inorganic P by aluminium (Al) and iron (Fe). Liming is one of the common ways to overcome this problem. However, this practice is not economical. The aim of this study was to evaluate the effects of laboratory incubation period and different rates of rice straw compost on the soil P availability. During the incubation study, Christmas Island rock phosphate (CIRP) fertilizer was amended with different rates of rice straw compost (5, 10, 15, and 20 t hasup?1/sup). Treatments were incubated in the laboratory for 30, 60, and 90 days. Application of rice straw compost with CIRP significantly increased soil available P at 30, 60, and 90 days of incubation, respectively. This implies rice straw compost plays an important role on soil P availability by decreasing the P adsorption due to the competing adsorption sites by organic anion and dissolving the mineral associated P by low-molecular-weight organic acids. Besides, rice straw compost also increased the soil pH, and, at the same time, reduced exchangeable acidity, exchangeable Al and Fe. As the soil pH increased, the compost effectively fixed the Al and Fe in the soil instead of P, thus increasing the P availability in the soil. However, there was no significant increase/loss of available P when the incubation time increases under treatments with rice straw compost. This implies the effectiveness of rice straw compost in minimizing the loss of P due to P fixation in soil and slow microbially mediated mineralization of soil organic P to inorganic P as incubation time increases. The findings suggest that the application of rice straw compost altered soil chemical properties in a way that enhanced the availability of P in the Rengam acidic soil.
机译：由于铝（Al）和铁（Fe）对可溶性无机P的固定，在热带酸性土壤中磷（P）的可用性受到限制。撒石灰是克服此问题的常用方法之一。但是，这种做法不经济。这项研究的目的是评估实验室潜伏期和稻草堆肥不同比例对土壤磷有效性的影响。在孵化研究过程中，对圣诞岛磷酸盐（CIRP）肥料进行了改良，使用了不同比例的稻草堆肥（5、10、15和20 t ha ？1 ）。将处理在实验室中孵育30、60和90天。水稻秸秆堆肥与CIRP配合使用分别显着增加了培养30、60和90天的土壤有效磷。这意味着稻草堆肥通过降低有机阴离子相互竞争的吸附位而降低了对磷的吸附，并通过低分子量有机酸溶解了与矿物相关的磷，从而对土壤磷的利用发挥了重要作用。此外，稻草堆肥还提高了土壤的pH值，同时降低了可交换的酸度，Al和Fe的交换性。随着土壤pH值的升高，堆肥有效地固定了土壤中的Al和Fe而不是P，从而增加了土壤中P的利用率。然而，当用稻草堆肥处理的孵育时间增加时，有效磷没有显着增加/减少。这意味着稻草堆肥可以最大程度地减少由于磷在土壤中固着而造成的磷损失，并且随着培养时间的延长，土壤中有机磷向无机磷的微生物介导矿化作用也很慢。研究结果表明，稻草堆肥的应用改变了土壤的化学特性，从而增强了伦加姆酸性土壤中磷的有效性。

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