Evaluation of fertilizer efficiency of cow manure applied to timothy grassland by estimating the nitrogen mineralization
2006
Matsumoto, T.(Hokkaido. Konsen Agricultural Experiment Station, Nakashibetsu (Japan)) | Hojito, M.
In order to elucidate the influence of the differences in chemical constituents of cow manure on dry matter production of timothy (Phleum pratens L.) in a field experiment, 17 different types of manure collected from dairy farms in Konsen district, Hokkaido, were applied to grassland surface. The range of water and total nitrogen (N) contents in the cow manure was 0.53 to 0.83 kg kg(-1), and 2.88 to 5.38 g kg(-1), respectively, on a fresh weight basis. The application rate of the cow manure was 40 Mg ha(-1). 1. Grass yield in the cow manure treatments was higher than that in the non-manure treatment. Although the application rate of the cow manure was the same, great differences were found in the grass yield among the manure treatments. 2. Great differences were found in the recovery rate of N from the timothy grassland when cow manure was applied. It was thought that the fertilizer efficiency of cow manure applied to timothy grassland fluctuated depending on the difference in the chemical constituent of cow manure. 3. It was possible to evaluate the potentially mineralizable N in the cow manure from the water content of cow manure. 4. From these results, the N efficiency of cow manure applied to timothy grassland can be evaluated by multiplying the total N content of the cow manure by the N mineralization rate.
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