Modeling the phosphorus balance of different soils using the 4M crop model
2012
Mathe-Gaspar, G., Hungarian Academy of Sciences, Budapest (Hungary). Inst. for Soil Sciences and Agricultural Chemistry | Fodor, N., Hungarian Academy of Sciences, Budapest (Hungary). Inst. for Soil Sciences and Agricultural Chemistry
Our study focuses on the phosphorus balance in two long-term fertilization experiments which were carried out in characteristic soils of Hungary with four fertilization treatments and four main crops. The objectives of this study were as follows: (1) to quantify the P accumulation rate in the upper soil layers and (2) to calibrate and validate the P-balance module of the 4M crop model. The concentration of ammonium-lactate soluble P (AL-P) increased with time in both soils. The mean AL-P accumulation rates in the 0-20, 20-40 and 40-60 cm soil layers were 3.7, 0.7, 0.1 and 3.7, 4.3, 0.6 mg/kg/year in the chernozem and the sandy soil, respectively. The P accumulation rates in the top layers (0-20 cm) changed significantly in time as these gradually decreased from around 6.5 mg/kg/year to zero in about 26 years in both soils. The model results of P content in different soil layers, as well as the plant P uptake were in good agreement with the observed values.
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