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Effect of Nitrogenous and Potassic Salts with Phosphates on the Yield and Phosphorus, Nitrogen, Potassium, and Manganese Contents of Oats (Avena sativa L.)¹

ABSTRACT

On a neutral Grey Wooded soil receiving identical rates of N, P, and K from different sources, there were significant differences (at the 5% level) in oat grain yields as well as straw yields. The choice of salts used influenced differently the yields of straw and those of grain. Whereas maximum grain yields were realized with monocalcium phosphate monohydrate (MCP) + (NH₄)₂SO₄ + KCl, maximum straw yields were obtained with MCP + (NH₄)₂SO₄ + K₂SO₄. With diammonium phosphate (DP) as a source of N and P, there were no significant differences in yield of grain or straw with the use of K₂SO₄ or KCl, however N, P and K uptake by straw was invariably greater with K₂SO₄ than with KCl. Despite the equivalence of N, P, and K applied, there were considerable differences in the nutrient composition of grain and straw. With the exclusion of the control treatment, N in straw varied from 0.40 to 0.54%, P from 0.021 to 0.046%, K from 3.38 to 3.94%, and Mn from 9.4 to 63.4 ppm. In a comparison of the nitrogenous sources associated with MCP + KCl, Mn uptake was in the order NH₄Cl > (NH₄)₂SO₄ > NH₄NO₂. While the symptoms of Mn deficiency were most pronounced for the control treatment, these symptoms disappeared in all the fertilized treatments excepting MCP + KNO₂.

¹ Contribution from Experimental Farm, Research Branch, Canada Department of Agriculture, Kapuskasing, Ontario.

² Present address: Soil Specialist, Research Station, Research Branch, Canada Department of Agriculture, St. Jean, Quebec.

Received for publication August 10, 1964. Accepted for publication October 20, 1965.