Effect of Nitrogen, Phosphorus and Potassium Fertilization on the Growth, Yield and Quality of Thompson Seedless Grapes

The present experiment on the effect of factorial combinations of three levels of N and two levels each of P₂O₅ and K₂O on the growth, cropping and nutrient status of five-year-old vines of Thompson Seedless grapes was conducted at Ludhiana during 1973–74.

The vines receiving 0.8 kg each of N and K₂O and 1.2 kg of P₂O₅ had the highest increase in trunk girth.

The treatment comprising 0.4 kg of N in combination with 1.2 kg each of P₂O₅ and K₂O gave the highest yield during both the years. This was associated with petiole contents of 1.16 per cent N, 0.53 per cent P and 3.43 per cent K during 1973 and 1.18 percent N, 0.48 per cent P and 3.12 per cent K during 1974. The highest percentage of juice was recorded in grapes borne by the vines receiving 1.2 kg each of N and P₂O₅ and 0.8 kg of K₂O. The T.S.S. were the highest under the treatment which received 0.8 kg each of N and P₂O₅ and 1.2 kg K₂O.