The effect of calcium, potassium, and boron fertilization upon the chemical composition and yield of alfalfa

The alfalfa plant is believed to have had its origin in a relatively dry area, possibly Persia (41). This plant grows luxuriantly under its adapted environment, but will not grow well at low fertility levels. In 1952, alfalfa production in Tennessee was only a little more than half that of 1949. Until this time, even though much research had been done with lime and phosphate in alfalfa production, very little attention had been given potassium and boron and the importance of a proper proportion of these elements to meet the crop's needs. Added information from research and farmer experience concerning fertilization, management, and soil adaptation of alfalfa has resulted in more persistent stands and higher yields, thus contributing to a greater emphasis in alfalfa production.

The purpose of this investigation was to evaluate the effect of various rates of annual top dressings of fertilizer on the yield and composition of alfalfa plants, on soil tests. These effects were measured by determining the exchangeable potassium, calcium, magnesium, and available boron in the soils on which the alfalfa grew and the potassium, calcium, magnesium,and boron content of the alfalfa forage. These values when related to yield may aid in determining the desired levels for optimum yields.