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Reduction of Nitrogen Losses Under Irrigation by Coating Fertilizer Granules¹

Resin-coated and noncoated NH₄NO₃ fertilizers were compared on irrigated soils with free drainage.

In the greenhouse studies, coated NH₄NO₃ at rates of 150, 300, 600, and 1200 mg N per pot were more efficient than noncoated NH₄NO₃ at the same rates in increasing forage yield and N content of blue panicgrass.

Coating the fertilizer particles did not affect cabbage yields under field conditions. However, increasing the coating thickness significantly reduced the N content of the cabbage.

N uptake and cabbage yields decreased significantly as soil moisture availability decreased.

NO₃ and mineralizable N levels in the soil indicated that the resinous membrane, by controlling fertilizer dissolution, reduced N leaching losses.

² Research Soil Scientists, USDA, Weslaco, Texas.

Received for publication May 29, 1965.