Science and Golf II: Proceedings of the 1994 World Scientific Congress of Golf

By A. J. Cochran; M. R. Farrally | Go to book overview

71

Response of creeping bentgrass (Agrostis palustris) to natural organic fertilizers

C.H. Peacock and J.M. Dipaola

North Carolina State University, Raleigh, North Carolina

Abstract

Response of creeping bentgrass (Agrostis palustris) maintained under putting green conditions to nitrogen (N) fertilizers can be characterized based on turf quality, growth response and N uptake. With the natural organic materials, source of the N carrier can influence longevity of turf response and N availability. This study evaluated natural organic and synthetic N carriers and combinations. Creeping bentgrass was fertilized at either 5 or 7.5 g N m-2 rates with ten N sources over a two year period. Turf performance was evaluated during the fall and spring based on turf quality, growth rates, and N uptake rates. A rate response was found for all parameters. Based on nitrogen uptake rates, products containing natural organic carriers combining bone meal, feather meal, wheat germ and soybean meal were most efficient at providing N for plant growth. By comparison, these materials had a N uptake rate seasonal average 100% higher than a sewage sludge based material which had the same water insoluble nitrogen (WIN) content.

Keywords: Bentgrass, Nitrogen, Turfgrass growth.


1 Introduction

Probably no category of turf fertilizer has seen expansion like that which has occurred among the “organics” over the last few years. Materials which have been used as nitrogen (N) carriers in natural organic fertilizers include blood meal, bone meal, animal tankage, soybean meal, feather meal, sewage sludge and compost. These materials vary greatly in the percent nitrogen from a low of 1% up to 14% which is close to the maximum of pure protein at 16% N. The sustained release of N from these materials can vary from 6 to 16 weeks depending on mineralization rate which is dependent on environmental conditions which favor degradation, adequate soil moisture and temperature, and the source of the carrier and how it is processed resulting in the percent Water Insoluble Nitrogen in the actual product

Science and Golf II: Proceedings of the World Scientific Congress of Golf. Edited by A.J. Cochran and M.R. Farrally. Published in 1994 by E & FN Spon, London. ISBN 0 419 18790 1

-471-

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