Potassium Fertilization of Prune Trees under Drip Irrigation1

Abstract
Fertilization with K2SO4 resulted in good uptake of K by trees of French prune (Prunus domestica L. cv. Agen) whether K was applied in drip water or dry K2SO4 was placed on the soil under the emitter and then drip irrigated. These methods were much more effective than applying K2SO4 in trenches alongside the trees and then sprinkler-irrigating. K fertilization with a drip system resulted in K movement to depths of 60 to 75 cm, where the soil is wet from drip irrigation and roots are abundant, enhancing K uptake.

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