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  Update of Nitrogen, Phosphorus and Potassium Needs on Various Forage Swards in New Brunswick




C. Karemangingo1, M. Basque2, M. Price3, M. Robichaud2, Peter Scott4, A. Scott1 and T. Bruulsema5

Partner: New Brunswick Soil and Crop Improvement Association

Abstract: This is the preliminary report of the study that monitored the effects of N, P, and K applications on established mixed forages (grasses and legumes) with regard to the dry matter yields. The study has been conducted at three sites located in the southeast (Riverview), the northeast (Tracadie), and the west (Woodstock) of New Brunswick. Ammonium nitrate, triple superphosphate, and potassium chloride were broadcast in the spring of 2002. The application rates of each nutrient varied upon the soil fertility status at each site. At Riverview, a 4X3X3 factorial treatment combined 0, 50, 100, and 150 kg N ha-1, 0, 50, and 150 kg P2O5 ha-1, and 0, 60, and 180 kg K2O ha-1. At Woodstock, a 3X4X3 experiment was composed of 0, 50, and 150 kg N ha-1, 0, 50, 100, and 150 kg P2O5 ha-1, and 0, 60, and 180 kg K2O ha-1. At Tracadie, the 3X3X4 factorial experiment was composed of 0, 50, and 150 kg N ha-1, 0, 50, and 150 kg P2O5 ha-1 and 0, 60, 120, and 180 kg K2O ha-1. The forage response to N, P, and K applications in terms of dry matter yields was site-specific related. Riverview (medium soil P and K) was the most responsive site. However, the forage dry matter yields increased with the increase of nitrogen applications at all the sites, the application of 100 kg N ha-1 providing the optimum yield of 7,145 kg dry matter ha-1 at Riverview at the regular harvest time. At this site, the application of 100 kg N ha-1, 50 kg P2O5 ha-1, and 60 kg K2O v appeared to represent an optimum combination for optimum yields. For all the sites, N, P, and K fertilizer applications favoured the crop growth when compared to the plant growth in the unfertilized plots. However, these preliminary results do not permit any valid conclusion.




1Land Development Branch, Department of Agriculture, Fisheries & Aquaculture, P.O. Box 6000, Fredericton NB E3B 5H1
2Land Development Branch Department of Agriculture, Fisheries & Aquaculture, Tracadie Office NB, E3B 5H1
3Agriculture Development Branch, Department of Agriculture, Fisheries & Aquaculture, P.O. Box 6000, Fredericton NB E3B 5H1
4Agriculture Development Branch Department of Agriculture, Fisheries & Aquaculture, 39 Baker Lane, Wicklow NB E7L 3S4
5 Potash and Phosphate Institute of Canada / Institut Potasse et Phosphate du Canada 18, Maplewood Dr Guelph, On N1G 1L8.

Agriculture, Aquaculture and Fisheries
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