Investigations of fertigation of peach on three soils I. Migration and localization of nitrogen
1999
Stoilov, G. | Koumanov, K. | Dochev, D. (Institute of Fruit-Growing, BG-4004 Plovdiv (Bulgaria))
The experiment was carried out in lysimeters on three soil types: alluvial-meadow soil (Fluvisol) - sandy loam, cinnamon-forest soil (Luvisol) - clay loam, and smolnitsa (Vertisol) - clay. The fertilizers - urea and phosphoric acid (H3PO4), were supplied through the irrigation system, the annual amounts being partitioned to monthly doses. Two-three weeks after fertigation, the applied nitrogen was completely depleted along the skeletel roots and zones of increased nitrate content were found at the periphery of the areas of intensive root extraction, appearing in the same time inner for the wetted soil volume. The local depletion of the applied nitrogen in the root zone necessitates a greater partitioning of the annual fertilization rate during vegetation in order to provide an optimal nutrition of the plants.
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