Phosphorus and potassium fertilization of dry pea

作者：Lafond Jean^*; Pageau Denis

来源：Canadian Journal of Plant Science, 2010, 90(5): 629-636.

• Enrichment
• efficiency
• phosphorus
• potassium
• Pisum sativum L.

Lafond, J. et Pageau, D. 2010. Phosphorus and potassium fertilization of dry pea. Can. J. Plant Sci. 90: 629-636. In Quebec, the P recommendations for dry peas (Pisum sativum L.) are nearly three times higher than those in western Canada, while recommendations for K are at least 20% lower. The objective of this project was to re-evaluate the P and K needs of dry peas under the climatic conditions of the Saguenay-Lac-Saint-Jean region (Quebec, Canada) in soils with a range of soil P and K availabilities. The treatments consisted of four P rates (0, 20, 40, 80 and 160 kg P(2)O(5) ha(-1)) and three K rates (0, 50 and 150 kg K(2)O ha(-1)). The trials were conducted at two sites over 3 yr. Site I was classified as low in P availability and site 2 as medium according to the soil analysis. Both sites had a medium level of soil K availability. Grain yields increased significantly, by 6%, with increasing fertilizer P (3246 to 3437 kg ha(-1)). Potassium fertilization had no significant effect on grain yields. Grain yields were also 37% higher in the highest soil P site. This low response of the crop to mineral fertilizers was attributed to the significant soil contribution to crop P and K needs. Soil tests have also indicated an enrichment of P and K with large inputs of mineral fertilizers. Thus, a rate of 30-35 kg P(2)O(5) ha(-1) for P poor soils would be sufficient to meet the crop needs. For soils with moderate levels of K (201-400 kg K ha(-1)), a rate of 50 kg K(2)O ha(-1) would be sufficient to meet the crop needs and to maintain the soil fertility.

• 出版日期2010-9