Effect of Nitrogenous and Potassic Salts with Phosphates on the Yield and Phosphorus, Nitrogen, Potassium, and Manganese Contents of Oats (Avena sativa L.)1
- Herman A. Hamilton2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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