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The effect of nitrate nitrogen and ammonium nitrogen ratio on the growth of several garden fruits in hydroponics 2. the effect of nitrate nitrogen and ammonium nitrogen ratio on the growth mineral content and yield of tomato


The effect of nitrate nitrogen and ammonium nitrogen ratio on the growth of several garden fruits in hydroponics 2. the effect of nitrate nitrogen and ammonium nitrogen ratio on the growth mineral content and yield of tomato



Research Reports of the Rural Development Administration 33(1 HORTIC): 1-6



This study was carried out to investigate the effect of NO3-N and NH4-N ratio on the growth of tomatoes, and tomatoes were grown for 4 months in a solution culture, half strength of Hoagland and Arnon's solution, which at constant total nitrogen concentration, the ratio of NO3-N and NH4-N in the nutrient solution, varied 93:7, 75:25 and 50:50. Plant height, leaf area, fresh weight and dry weight with 93:7 fed plants were better than those with 50:50 fed plants, but was not significantly different from 75:25. K, Ca and Mg content with 93:7 fed plants were higher, but P content was highest with 50:50 and lowest in 93:7. Not only yield was highest at 93:7, but also fruit fresh weight was heavier. Blossom-end rot incidence was greatest at 50:50 and smallest at 93:7. Root activity measured biological oxygen monitor was highest at 93:7 and lowest at 50:50. pH in the solution at 50:50 lowered rapidly according to the time course.

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