Tuesday, 8 November 2005
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Summary of Soil Test Phosphorus Results from Home Lawns and Athletic Fields in New York State: 2001 - 2005.

D. Soldat, A. M. Petrovic, and R.B. Rao. Cornell University, Ithaca, NY 14853

Restrictions and bans on P fertilization to turfgrass have been appearing across the US in response to declining surface water quality in watersheds with significant urban/suburban populations. Where restrictions are in place, P applications are usually allowed if a soil test shows the agronomic need for such an application. For this reason, we felt it would be important to seek information on the soil test P levels for turfgrass areas throughout New York State. Between Jan. 2001 and July 2005 3,803 soil samples from home lawns and athletic fields in New York were submitted to the Cornell Nutrient Analysis Laboratory (CNAL). Eighty-seven percent of those samples were from home lawns. The numbers of samples were fairly evenly distributed among four soil management groups that are delineated by soil textural differences. Differences in Morgan-extractable soil P were not meaningful among the groups or between lawns and athletic fields. The median soil P level was 6.4 mg P kg-1 and the mean was 13.8 mg P kg-1. The greatest soil P levels were found on soil with a pH between 6 and 8. Of the samples submitted, 19% could be classified as very high by agronomic standards (>20 mg P kg-1). Additionally, 41% were considered medium of low (<4.5 mg P kg-1), and for these fertilizer recommendations were made. Ninety-six percent of the samples were below 50 mg P kg-1. Although the sample is by no means a random sample, we feel that the results are representative of the population. If the results are skewed, they are most likely skewed to show soil P levels higher than the true population because homeowners who invest in soil analysis are probably more likely to make frequent fertilizer applications to their property.

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