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The effect of nitrate to ammonium ratio on the growth of several garden fruits in hydroponics 1. the effect of nitrate to ammonium ratio on the growth mineral content and yield of strawberry fragaria grandiflora ehrh


The effect of nitrate to ammonium ratio on the growth of several garden fruits in hydroponics 1. the effect of nitrate to ammonium ratio on the growth mineral content and yield of strawberry fragaria grandiflora ehrh



Research Reports of the Rural Development Administration 31(3 HORTIC): 6-17



This study was carried out to investigate the effect of NO3:NH4 ratios on the growth of strawberry, Fragaria grandiflora EHRH cv. Yeobong, Yeohong, Poonghyang, Ai-berry and Bokyojosaeng, and strawberrys were grown for 4 months in solution culture, half strength of Hoagland and Arnon's solution, which at constant total nitrogen concentration different ratio of NO3:NH4 in the nutrient solution, varied 93:7, 75:25, 50:50 and 25:75. The growth in the ratio 75:25 was better than in the ratios 93:7 and 50:50. Especially, fresh weight and dry weight in Yeobong supplied with 75:25 was markedly weightier those in other varieties. However, leaf length and leaf width were not significantly different among NO3:NH4 ratios. K and Mg content with 93:7, and Ca with 75:25 feed plants were higher, but P content was highest with 25:75 and lowest 93:7. Not only yield was highest at 75:25 in cv. Poonghyang, but also fruit fresh weight was higher. Ratio of malformed fruits was highest at 50:50 and lowest at 93:7. All the plants were withering death in 25:75, 45 days after treatment. Plant growth rate was higher at the late stage, 2 months after planting than early stage, 2 to 4 months after planting, and pH in the solution lowered rapidly according to the time course at 25:75.

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