EFFECT OF VARYING LEVELS AND SOURCES OF NITROGEN ON YIELD AND PROCESSING QUALITIES OF TOMATO VARIETIES
Studies were conducted to ascertain the effect of varying levels and sources of nitrogen on the yield and processing qualities of tomato varieties during winter and spring crop seasons. It was found that variety Punjab Chhuhara produced significantly higher marketable yield (211.3 and 234.1 q/ha) than Punjab Kesri (196.2 and 221.7 q/ha) followed by other varieties during spring seasons of both the years. The yield increased from 0 to 200 kg N/ha and the response was almost linear upto 150 kg N/ha. Calcium ammonium nitrate proved superior as a source of nitrogen. In winter season, varieties Ostankinskij and Cold Set proved superior. Fruits of Punjab Chhuhara had higher total soluble solids and lower locule number, thus suitable for tomato ketchup. Ostankinskij and Cold Set grown in winter and Punjab Kesri grown in spring were found to be rich in juice percentage and low in titrable acidity. Cold set and Punjab Kesri had as high as 13.9 and 13.7 mg/ml of ascorbic acid content in winter and spring seasons, respectively but Ostankinskij and Punjab Chhuhara had higher dry matter percentage. Nitrogen application upto 150 kg/ha raised total soluble solids, juice percentage, ascorbic acid and titrable acidity, but reduced dry matter percentage.
Kooner, K.S. and Randhawa, K.S. (1990). EFFECT OF VARYING LEVELS AND SOURCES OF NITROGEN ON YIELD AND PROCESSING QUALITIES OF TOMATO VARIETIES. Acta Hortic. 267, 93-100