Effects of Foliar NPK Application on Growth, Yield and Nutrient Content of Sweet Corn Grown on Rengam Series Soil

The present study was carried out to evaluate the effects of different rates of macronutrients as a foliar spray on the growth performance, yield, and nutrient content of sweet corn grown in the Rengam soil series. The treatments consisted of five rates of macronutrients as a foliar fertilizer at 0, 25, 50, 75, and 100 % NPK. Foliar NPK was applied 25 and 50 days after sowing to the sweet corn seedlings. The results showed that fresh cob weight, cob number, flowering, and dry matter yield of sweet corn significantly increased at the rate of 75%, and 100% of NPK foliar fertilizers. The macro and micronutrient concentrations in ear leaf, mature leaves, stem, cob, and flowers of 75 and 100% NPK treated corn were significantly increased over the control plants. The macronutrient content in the whole plant was also significantly higher at 75% and 100% NPK treatments. Fe and Mn contents in the whole plant were also the highest in 75% and 100% NPK treatments. Macronutrient concentration in ear leaf and whole corn plants significantly correlated with the fresh cob yield of corn. It is concluded that foliar application of N, P, and K macronutrients (75 to 100% NPK) enhanced the yield and quality of sweet corn.