The influence of fertilization on different forms of phosphorus and their change in soil
2003
Antanaitis, A. | Lubyte, J. | Mazvila, J. (Lithuanian Inst. of Agriculture, Kaunas (Lithuania). Agrochemical Research Centre) | Vaisvila, Z.
Total, fractional, and phosphorus extracted by 7 different extragents were determined in soil samples from crop rotation fertilization experiments in Skemiai, Radviliskis region, in Kriukai, Sakiai, and Rumokai, Vilkaviskis region. A reliable increase of total phosphorus in layers 0-20 cm and 21-40 cm was obtained in plots of long-term fertilization (28 years) experiment where high rates (90-180 kg ha*[-1)) of phosphorus fertilizers were used. However, total amount of phosphorus did not change esentially even in arable layer where 60-120 kg ha*[-1) of P2O5 was applied annually during the period of 8 years. When fractional phosphorus was determined by the method of Chang-Jackson, the most significant increase in 1M NH4Cl soluble phosphorus was found in Skemiai experiment, while in Kriukai and Rumokai the changes were insignificant. Compared with the A-L method, other investigated extragents extracted smaller amount of mobile phosphorus from soil - from 0.17% to 94.0%.
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