National Botanical Research Institute, Lacknow and Department of Agriculture, Uttar Pradesh, Lucknow
The effect of five levls of nitrogen, phosphorus and potassium fertilization on vigour, yield and quality of Grapevine, cv. ‘Gulabi’ using second order Rotatable Design was studied at Lucknow over a period of six years. The critical factor of these elements for obtaining maximal yield in the first experiment was observed to be 489 44 kg N, 457.42 kg P and 459.75 kg K/hectare. The corresponding values for the second successive experiment were 619.60 kg N. 416.93 kg P and 470.49 kg K/hectare confirming the reselts of the first experiment. The vigour of Gulabi vine as represented by the prunes weight could be increased by increasing nitrogen above the middle level and decreasing phosphorus and potassium below the middle level. The influence of potassium was more marked on acidity as with the increase in supply of potassium there was a steady decrease in acidity. In general the results of these experiments showed that the levels of nitrogen fertilization employed in this study had a large and consistent effect on total yield and growth of vines and that excessive nitrogen is deterimental to fruitfulness.
