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Accumulation and Decline of Available Phosphorus and Potassium in a Heavily Fertilized Honeoye Silt Loam Soil¹

ABSTRACT

Seven years of different rates of fertilizer application on vegetable crops were followed by 2 years when only N was applied. Fertilizer P and K treatments were then superimposed for the next 6 years.

During years of application of fertilizer P and K, residual soil P and K accumulated in available forms as measured by soil test. The higher the rate of application of fertilizer P and K, the higher was the accumulation of available soil P and K. After application of fertilizer P and K was discontinued, there was a rapid decline in residual available soil P and K. After 8 years without application of fertilizer P and K, there was still a highly significant residual soil P effect, and a significant residual soil K effect in one of the two fields.

¹ Joint contribution from the Department of Vegetable Crops, New York State Agr. Exp. Sta., Geneva, and the Department of Agronomy, Cornell University Agr. Exp. Sta., Ithaca, New York. Approved by the Director of the New York State Agr. Exp. Sta. for publication as Journal Paper No. 1397, and by the Department of Agronomy, Cornell University Agr. Exp. Sta., as Agronomy Paper No. 650.

² Assistant Professor of Vegetable Crops, Experimentalist, and Professor of Vegetable Crops, Department of Vegetable Crops, New York State Agr. Exp. Sta., Geneva, and Professor of Soil Science, Cornell University Agr. Exp. Sta., Ithaca, New York, respectively.

Received for publication July 13, 1964. Accepted for publication October 7, 1964.