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Effect of $NO_3-N$ : $NH_4-N$ Ratio in Nutrient Solution on Growth, Yield and Fruit Quality of Strawberry 'Akihime' in Hydroponic System  

Jun, Ha-Joon (College of Life & Enviromental Science Daegu University)
Hwang, Jin-Gyu (College of Life & Enviromental Science Daegu University)
Son, Mi-Ja (College of Life & Enviromental Science Daegu University)
Yoon, Hae-Suk (Gyeongnam Agricultural & Extension Services)
Publication Information
Journal of Bio-Environment Control / v.18, no.1, 2009 , pp. 40-45 More about this Journal
Abstract
The experiment has investigated the effects of growth, yield, fruit quality and cation absorption of strawberry 'Akihime' in different $NO_3-N:NH_4-N$ ratio in nutrient solution. $NO_3-N:NH_4-N$ ratios were 5.5:0, 4.0:1.5 and $3.0:2.5me{\cdot}L^{-1}$. As the ratio of $NH_4-N$ increased, pH was decreased by $5.0{\sim}6.0$ and EC sustained $0.8{\sim}1.0dS{\cdot}m^{-1}$ during experiment. Though in high $NH_4-N$ ratio of $3.0:2.5me{\cdot}L^{-1}$, the absorption of cations(K, Ca and Mg) was not inhibited. Treatment in contained $NH_4-N$ showed a tendency of increasing of petiole length and leaf width. The fruit length, fruit width, fruit weight and soluble solids were not significantly different. Yield per plant was lowest in $4.0:1.5\;me{\cdot}L^{-1}$, of $NO_3-N:NH_4-N$ ratio. Malformation fruit has not shown during the whole growth period.
Keywords
cations; hydroponics; malformation fruit; $NO_3-N:NH_4-N$ ratio; strawberry;
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