Effect of Nutrient Solution Strength on Growth, Fruit Quality and Yield of Strawbeny 'Maehyang' in Hydroponics

摘要

Experiments were conducted to investigate the optimum concentration of nutrient solution for strawberry 'Maehyang' bred domestically for exportation in hydroponics. Nutrient solutions for strawberry, which was made by Yamazaki, were supplied electrical conductivity (EC) 0.6, 0.8, 1.2, and 1.8 dS.m~(-1) after planting on cocopeat medium during the experiment period. Growth of shoot of strawberries did not show any statistical differences among treatments. Fruit length showed the longest in EC 0.8 and1.2 dS-m~(-1) , followed by 0.6 and 1.8 dS-m~(-1) in the first and third cluster. It showed the shortest in EC 1.8 dS-m~(-1) in the second cluster but there were no significant differences among treatments in the fourth cluster. Fruit diameter did notshow significant differences among treatments in the first and second cluster but was the longest in the lowest concentration EC 0.6 dS-m~(-1) in the third cluster. The shortest was in EC 1.8 dSm~(-1) in the fourth cluster. The heaviest mean fruit weight appeared in EC 0.8 and 1.2 dS-m~(-1) , and the lightest was in EC 1.8 dS-m~(-1) in the first cluster and also lightest in EC 1.8 dS-m~(-1) but no significant differences was found among other treatments in the second & third cluster. Also the fruitweight was significantly light in plants grown in EC 1.8 dS-m~(-1) than 0.6 dS'm~(-1) in the fourth cluster. Soluble solids content of fruit was the highest in EC 0.6 dS.m~(-1) in all cluster. As a result, we came to the conclusion that the optimum ECfor strawberry 'Maehyang' was EC 0.8 - 1.2 dS'm~(-1) during low temperature season. This result will be utilized as an indicator for strawberry hydroponics.