Agriculture, Pêche et Aquaculture
Department of Agriculture, Aquaculture and Fisheries
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  Agri-Environmental Impact of Netrogen Based Versus Phosphorus Based Applications of Liquid Dairy - Manure on Red Clover

C. Karemangingo1, W. Brown2, C. Everett1 and A. Scott1

Partner: New Brunswick Soil and Crop Improvement Association

Abstract: : Liquid dairy manure application can be based on its phosphorus content in order to protect the environment. The objective of this study is to evaluate the opportunity of such a practice on red clover. Four treatments applied in the spring included conventional chemical fertilization of red clover hay, liquid dairy manure applied based on N needs without (Nm) or with P need adjustment (Nm+P), liquid dairy manure applied based on P needs (Pm). K needs were always more sufficient than under manure applications. An additional amount of zero or 28 kg N ha-1 was applied on the second cut. A split-plot design having the spring treatments in the main plots and the second application of N after the first cut in the subplots were used in three replicates. Preliminary results indicate that the treatments did not have significantly different effects on the 1st or 2nd cut. Averaged yields of 4631 and 3092 kg ha-1 (dry weight) were harvested from the two consecutive cuts. Treatments did neither have different effects on the soil nor on the feed quality although the yields of the 2nd cut contained different concentrations of Ca and B. The soil supplied amounts of N varying from 143.4 to 177.7 kg N ha-1 under Pm et Nm+P, respectively. For P, 43.7 kg P2O5 ha-1 was taken up from Nm and half of it from Pm. Pm has left higher residual P amounts in the soil.

1 Land Development Branch, Department of Agriculture, Fisheries & Aquaculture, Fredericton NB E3B 5H1

2 Agriculture Development Branch, Department of Agriculture, Fisheries & Aquaculture , P.O. Box 5305 Sussex NB E4E 7H7

Agriculture, Aquaculture and Fisheries
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