Quantity and relationships of certain elements in Michigan legume hays
1938
Millar, C.E.
A statistical study of the effect of fertilization on plant composition and of the interrelationships of nutrient elements in alfalfa, sweet clover, and red clover hay, based on analyses of these plants accumulated during a 13-year period, warrants the following conclusions: Nitrogen and phosphorus contents correlated closely. Nitrogen-potassium, potassium-phosphorus, magnesium-phosphorus, and magnesium-nitrogen contents all showed positive relationships. Calcium-phosphorus, nitrogen-calcium, calcium-magnesium, and calcium-potassium contents all showed inverse relationships. The phosphorus content of alfalfa hay grown on heavy soils was higher than that of hay, grown on light soils. Superphosphate applications did not change the phosphorus content of field-grown alfalfa hay. Superphosphate fertilization showed a slight tendency to increase the phosphorus content of alfalfa leaves grown on light soil. Large applications of superphosphate increased the phosphorus content of greenhouse-grown alfalfa hay. The phosphorus content of field-grown red clover and sweet clover was increased by superphosphate fertilization. Limestone applications reduced the phosphorus content of alfalfa. Potash applications tended to increase the phosphorus content of alfalfa, did not effect the phosphorus content of red clover, and increased the phosphorus content of sweet clover.
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