Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8878907 | European Journal of Agronomy | 2018 | 9 Pages |
Abstract
The critical Bray-P thresholds were 14.3, 12.5 and 19â¯mgâ¯kgâ1 for soybean, maize and wheat, respectively. The rate of decline of the Bray-P pool in the âP treatments was described by an exponential decay function common to the five study sites. Obtained results indicated that a net extraction of 327â¯kg P per hectare is needed to reduce their initial Bray-P values ââby half, regardless of the initial soil Bray-P value. The soils fertilized with P showed a significant and linear increase in Bray-P. It was possible to fit a single function after pooling the data of the five sites. This combined function indicated that 3.2â¯kgâ¯Pâ¯haâ1 were necessary to increase Bray-P in 1â¯mgâ¯kgâ1. Obtained data on crop P critical levels and rates at which soil-test P declines or increases according to the P balance constitutes a useful tool for sustainable use of P resources in Mollisols and related soil units. They can help to monitor future changes of soil P levels and to estimate the P demand of croplands.
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Agronomy and Crop Science
Authors
Florencia A. Sucunza, Flavio H. Gutierrez Boem, Fernando O. Garcia, Miguel Boxler, Gerardo Rubio,