Some agrochemical indexes of brown forest-soil evolution, in accordance with long time fertilization
1993
Borza, I. (Universitatea de Stiinte Agricole a Banatului, Timisoara (Romania)) | Timbota, I. | Ianos, G. | Tarau, D. (Oficiul pentru Studii Pedologice si Agrochimice, Timisoara (Romania)) | Pusca, I. (Ministerul Agriculturii si Alimentatiei, Bucuresti (Romania))
Mineral fertilization with nitrogen and phosphorus, for 19 years, on a stationary experiment, increased the harvest and modified some chemical features of soil. Soil fertilization depended on these modifications which are clear only in 0-40 cm stratum. Nitrogen fertilizers, applied alone or in a high ratio with phosphorus resulted in: soil acidulation with an 0.018 pH units /100 kg nitrogen/hectare yearly ratio and 0.029 pH units/200 kg nitrogen/hectare. Phosphorus fertilizers stopped the negative effect of nitrogen on pH, and this fertilizer produced an increase of movable phosphorus from soil, with an 2.29-2.48 ppm/100 kilograms P2O5 yearly ratio. The result of the fertilizers applied is a clay content increasing, because of organic matter additional share.
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