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

배추에 대한 황산고토와 수산화고토의 비효 비교

  • 이상조 (영남대학교 생물자원학부) ;
  • 이승호 (영남대학교 생물자원학부) ;
  • 신현진 (영남대학교 생물자원학부) ;
  • 조현종 (대구대학교 생명환경학부) ;
  • 김복진 (영남대학교 생물자원학부) ;
  • 정종배 (대구대학교 생명환경학부)
  • Received : 2003.07.01
  • Accepted : 2003.07.21
  • Published : 2003.08.30

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.

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