Time and method of supplying calcium as factors affecting production of peanuts
1948
Reed, J.F. | Brady, N.C.
Calcium was supplied to large-seeded Virginia-type peanuts under field conditions by means of dolomitic limestone and gypsum. These materials were applied at various times and rates. Potassium and phosphorus variables were also included to determine the effects of these elements when calcium needs were met. Studies were made of the changes in certain chemical properties of the soil and of the yields and stem composition of peanuts. In order to evaluate the components of yield, determinations were made of plant heights, percentage fill, and other fruiting characteristics. The level of soil calcium did not increase as much as would have been expected after the addition of either dolomitic lime or gypsum. The various sources and times of application of calcium made but little difference as far as affecting the level of calcium in the zone of fruit formation. On the soils very low in calcium, large increases in yield were obtained from calcium additions made by any of the various methods. Broadcast applications were generally less effective the second year after application than gypsum applied each year. Analyses of the plant stems showed pronounced effects of soil treatment upon the plant composition. Broadcast applications of lime resulted in a decrease in K content of the plant, but localized placement of gypsum resulted in an increase in calcium, magnesium, and potassium in the plant. In evaluating the effect of the treatments on peanut yield and fruit characteristics, the importance of studying the yield components is stressed.
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