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Journal of soil science and plant nutrition

versão On-line ISSN 0718-9516

Resumo

YANG, S et al. Effect of fulvic acid on the phosphorus availability in acid soil. J. Soil Sci. Plant Nutr. [online]. 2013, vol.13, n.3, pp.526-533.  Epub 27-Ago-2013. ISSN 0718-9516.  http://dx.doi.org/10.4067/S0718-95162013005000041.

The incubation experiment was conducted to evaluate the influence of fulvic acid (FA) on phosphorus (P) movement and transformation in acid soil. FA at the rate of 0, 0.1, 0.2, 0.3 g and in combination with 0.19 g KH2PO4 was sprinkled uniformly on the surface of the filter paper on the soil cylinder for 21 days incubation, respectively. The result showed that the pH of soil treated with FA increased from the original value of 5.83 to the highest value of 6.27 in the surface soil layer after 21 days incubation. Due to the application of FA, exchangeable Al concentration evidently decreased in comparison to the only P treatment, which in turn significantly increased available P concentration. FA also increased the movement length of P that reached 4.5, 5.5 and 6.5 cm depth for treatments reinforced with 0.1, 0.2 and 0.3 g FA per column, respectively. As FA was added into soil, microbial population, organic matter content and cation exchange capacity (CEC) all clearly elevated. It is suggested that P fertilizer and FA are fertilized together may be considered as an optimum choice for the improvement of P availability and soil physicochemical conditions.

Palavras-chave : Aluminium; microbial population; phosphorus availability; organic matter.

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