Study phosphorus kinetics release from the rock phosphate under the influence of different humus acids (Humic and Fulvic) levels
DOI:
https://doi.org/10.48162/rev.57.1.31Keywords:
Humus acids, kinetic equations, calcareous soil, rock phosphorous.Abstract
The availability of phosphorus in calcareous soil is an important topic for researchers in the field, Therefore, a laboratory experiment was conducted on the fate of phosphorus added to the soil, testing release and kinetic equations to describe the equilibrium quickly in the equilibrium medium. A Completely Randomized Design C.R.D design was applied using three levels of on rock phosphate (0.0,50.0 and 100.0) kg P h-1 treated with two types of humus acids (humic and fulvic) acids in three levels each one (0.0, 25.0 and 50.0) kg h-1. The results showed that the second-order equation gave the highest coefficient of determination and the lowest standard error and that the half-time of phosphorus increased with increasing levels of addition of humic acids. Fulvic acid outperformed the rest of the treatments, giving the highest concentration of available phosphorus, reaching 33.45 mg kg-1 at 25 days (F2P2). When added at the highest level, the half -time of phosphorus was 16.36 days (CP2), while the half-time of phosphorus was 61.50 days (CP0). The half-life of phosphorus increased with the increase in the level of humus acids addition, as the half-time of phosphorus was 119.84 days in the treatment (F2P0). While the half-time of phosphorus was 16.14 days in the treatment (H1P2). The addition of humic acids outperformed all treatments in increasing the half-time. To improve the availability of phosphorus obligate adding levels high of rock phosphate and humus acid.
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