Effect of different nitrogen rates in growth dynamics, yield and quality of tomato (Lycopersicon esculentum Mill.)
1997
Petrovic, N.
A trial conducted in order to determine the effect of increasing nitrogen rates (from 0 to 160 kg/ha, with constant phosphorus (100 kgP2O5/ha)) and potassium (100 kgK2O/ha) levels on the growth dynamics, yields and quality of tomato. Two tomato lines used in the study: N7 (determinate) and V44 (indeterminate). In breeding line N7, fertilization increased plant height, leaf mass and number, and stem mass, while stem dry matter content decreased. In breeding line V44, nitrogen additions increased plant height, leaf mass, stem mass, and stem dry matter content, while the number of leaves dropped. Fertilization had no effect on leaf dry matter content. In line N7, the average fruit yield was 40.7 t/ha, and it was on the increase up to the rate 120 kg N/ha. The average fruit yield in line V44 was 37.4 t/ha, and it was increasing up to 160 kg N/ha. Total yield was rising up to 120 kg N/ha, and there were significant differences between the two years of study. The best quality of tomato was obtained from the first harvest of the N40P100K100 treatment. In line N7, higher N rates increased only acid content, while dry matter content, sugar content, and vitamin C content decreased. In line V44, higher rates of N had no effect on quality
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