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Effect of Mg-Sulfate and Mg-Hydroxide on Growth of Chinese Cabbage  

Lee, Sang-Jo (Dept. of Agronomy, Yeungnam University)
Lee, Sung-Ho (Dept. of Agronomy, Yeungnam University)
Shin, Hyun-Jin (Dept. of Agronomy, Yeungnam University)
Cho, Hyun-Jong (Dept. of Agricultural Chemistry, Daegu University)
Kim, Bok-Jin (Dept. of Agronomy, Yeungnam University)
Chung, Jong-Bae (Dept. of Agricultural Chemistry, Daegu University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.36, no.4, 2003 , pp. 218-224 More about this Journal
Abstract
Magnesium hydroxide, which recently registered as a Mg fertilizer, is greatly different from magnesium sulfate in its solubility and effect on soil pH. In this study, the effects of magnesium hydroxide and magnesium sulfate on growth of chinese cabbage were compared at the application rate of $300kg\;MgO\;ha^{-1}$ in a Gyeongsan clay loam soil. Although magnesium hydroxide was effective in increasing number of leaf and fresh weight, overall effects of magnesium hydroxide and magnesium sulfate on the growth of chinese cabbage were not significantly different ($p{\leq}0.05$). Comparing the two magnesium fertilizer treatments, magnesium content of chinese cabbage was relatively higher in the magnesium sulfate treatment in the early stage of growth, but it was higher in the magnesium hydroxide treatment at harvest. Contents of Ca, P, and K in chinese cabbage were relatively higher in the magnesium hydroxide treatment than those in magnesium sulfate treatment. But, the differences in nutrient uptakes by chinese cabbage between the treatments were not significant ($p{\leq}0.05$). Therefore, magnesium hydroxide is expected to be used with nearly the same effects on crops as magnesium sulfate at the same application rate of Mg. Soil pH in the treatment of magnesium sulfate was lower than that of control treatment, but magnesium hydroxide could increase pH. Magnesium hydroxide can be used preferentially in acid and/or sandy soils, where magnesium sulfate can induce further soil acidification and leaching loss of Mg is often a severe problem.
Keywords
Chinese cabbage; Magnesium fertilizer; Magnesium hydroxide; Magnesium sulfate;
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