EFFECT OF APPLICATION RATIO OF POTASSIUM OVER NITROGEN ON LITCHI GROWTH AND FRUIT QUALITY
Soils in litchi orchards in southern China are commonly deficient in potassium, and low K contents in litchi plants commonly occur. Based on the same use amount of phosphorus, calcium, magnesium, zinc, boron and molybdenum, a field experiment with different application ratios of potassium over nitrogen (K2O/N: 0.6, 0.8, 1.0, 1.2 and 1.4), was conducted during 2009-2012 in Feizixiao litchi, grown in a typical upland orchard of Guangdong Province, where soil fertility was low in nitrogen and deficient in potassium. The effect of use ratio of K2O/N on litchi growth, fruit quality and flavor and shelf life was examined. The results showed that when K and N fertilizers were applied at the ratio of 1.0-1.2, litchi leaves had a higher photosynthetic rate, oxidation resistance and starch buildup, leading to better fruit size and quality with higher vitamin C content, soluble sugars, and so on. Litchi growth was inhibited, and fruit quality was reduced by increased or decreased K2O/N ratio. Overall, litchi generated the highest fruit yield and the best production profits when K was applied at the rate of 1.2 times higher than N. Therefore, the use ratio of K and N fertilizers (K2O/N) is recommended in the range of 1.0 to 1.2 in litchi.
Yao, L.X., Li, G.L., Yang, B.M., He, Z.H., Zhou, C.M. and Tu, S.H. (2014). EFFECT OF APPLICATION RATIO OF POTASSIUM OVER NITROGEN ON LITCHI GROWTH AND FRUIT QUALITY. Acta Hortic. 1029, 199-208
litchi, K2O/N ratio, potassium