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Water Repellent Soil Mulch for Reducing Fertilizer Nutrient Leaching: II. Variables Governing the Effectiveness of a Siliconate Spray¹

ABSTRACT

Nitrogen and potassium leaching from a fertilizer band in sand soils was reduced by creating a mulch of water repellent soil over the band using a siliconate spray. Best results were obtained using a 1% siliconate spray in quantities sufficient to penetrate about 3 cm over a region 20 cm wide, on the flat surface of raised vegetable beds. Mulches created on peaked beds were ineffective in reducing leaching, probably due to erosion of the mulch. Sweet corn (Zea mays var. rugosa) yields were comparable to those obtained by protecting N and K with plastic mulch or by applying N and K in split applications.

¹ Contribution from the Institute of Food & Agricultural Sciences, Univ. of Florida, Agr. Res. and Educ. Center, Belle Glade, Fla. 33430.

² Associate Professor, Associate Professor, and Professor, respectively.

Received for publication October 15, 1973. Accepted for publication April 11, 1974.