Abstract
These studies were made to determine the effect of applied nitrogen, phosphorus, and potassium on yields of autumn crops of potatoes grown in Panjab. The application of 225 lb of nitrogen per acre resulted in high yields in the double row method of planting used. The estimated optimum rate of nitrogen per acre was 270 lb. Response of the crop to nitrogen seemed to be affected by soil types and seasonal weather conditions. Addition of 75 lb of phosphorus per acre increased yields significantly in one experiment and its value seems to depend upon soil nutrient level, previous soil treatment, and weather conditions. Seventy-five pounds of potassium did not increase yields; however, a modest amount of potassium to avoid soil depletion is probably desirable as a safeguard for high yields.
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