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Agrochemical evolution of brown podzolic soil under the influence of the nitrogen phosphorus potassium mineral fertilizers in a long term experimental field



Agrochemical evolution of brown podzolic soil under the influence of the nitrogen phosphorus potassium mineral fertilizers in a long term experimental field



Analele Institutului de Cercetari Pentru Pedologie si Agrochimie 49: 249-260



The effects of the annual fertilization with N, P, K on the soil agrochemical properties in a winter wheat-corn rotation after 24 years since the establishment of the experiment and, especially, in the last ten years are presented. Under the influence of ammonium nitrate the pH values have increased or decreased. These differences were due to the neutralization degree of the acidity developed by the ammonium nitrate with the basic cations supplied by the superphosfate (Ca2+) and the potassium salt (K+, Na+). In the last ten years, the least changes of pH values occurred in the plots with the highest N amounts (-0.07 ..-0.09 .DELTA.pH) showing a clear tendency towards a soil reaction stabilization in the strong acidic range (pH .apprx. 4,7). Generally, the evolution of the soil humus content was positive. It depended on the development of root biomass that represented the main organic source for the humus synthesis in this soil. Under the strong acidic acidic conditions created by N fertilizer an important mobilization of aluminium occurred and parasite micromycetes proliferated, both with detrimental effects on root development. P and K fertilizers had a positive effect on root development and health leading to important increases in soil humus. Another explanation for the unfavorable influence of the strong acidity on soil humus evolution could be related to the predominance of fulvic acid synthesis and the migration of these lower molecular compounds in the soil profile.

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