Chinese chive could be harvested four to five times per year in green house without heating facility to be one of the highly profitable crops. Although physico-chemical properties of its cultivation fields play a crucial role in sustaining high productivity, there have been no systematic researches ...
Chinese chive could be harvested four to five times per year in green house without heating facility to be one of the highly profitable crops. Although physico-chemical properties of its cultivation fields play a crucial role in sustaining high productivity, there have been no systematic researches on the soils. In fact, the physico-chemical properties of the optimal soils still remain unestablished yet. This study focused on elucidating the optimal physico-chemical properties of the soils for green house Chinese chive through the analyses of the green house fields in the major production areas in Korea, In addition, the optimal level of available sulfur in the fields was also evaluated by pot experiment. The investigated fields showed higher values of chemical properties than those recommended by Rural Development Administration of Korea(RDA). RDA recommended the optimal ranges as follows; pH 6.0 ~ 6.5, organic matter content 25 ~ 35 g/kg, available phosphate 350 ~ 450 mg/kg, exchangeable K+ 0.7 ~ 0.8 cmolc/kg, exchangeable Ca2+ 5.0 ~ 6.0 cmolc/kg, exchangeable Mg2+ 1.5 ~ 2.0 cmolc/kg, electric conductivity <2.0 dS/m. On the other hand, the ranges evaluated from the values distributed in 75 % fractions of the investigated fields led to the optimal ranges as follows; pH 6.5 ~ 7.2, organic matter content 25 ~ 55 g/kg, exchangeable K+ 0.6 ~ 2.4 cmolc/kg, exchangeable Ca2+ 5.0 ~ 12.0 cmolc/kg, exchangeable Mg2+ 1.5 ~ 3.5 cmolc/kg, electric conductivity 10 cm, hardness of surface soils <20 mm, bulk density 40 %, and clay content >30%. Most of the soils were moderately drained, It seemed that growth was more affected by soil drainage than soil texture. The relationship of soil nitrogen and sulfur contents to those of Chinese chive indicated that the sulfur content of Chinese chive seemed to be proportional to soil available sulfur content up to a value of soil available sulfur content, 70 mg/kg. The effect of sulfur fertilization on growth of Chinese chive suggested that its growth and biomass are optimized at a level of soil available S 300 mg/kg. This study shows that the chemical and physical properties of green house Chinese chive fields need to be further optimized for sustainable high productivity. Although this study proposed the optimal ranges of the physical and chemical properties of green house Chinese chive fields, it is necessary to further optimize them by conducting a variety of related works for sustainable high productivity and quality of green house Chinese chive.
Chinese chive could be harvested four to five times per year in green house without heating facility to be one of the highly profitable crops. Although physico-chemical properties of its cultivation fields play a crucial role in sustaining high productivity, there have been no systematic researches on the soils. In fact, the physico-chemical properties of the optimal soils still remain unestablished yet. This study focused on elucidating the optimal physico-chemical properties of the soils for green house Chinese chive through the analyses of the green house fields in the major production areas in Korea, In addition, the optimal level of available sulfur in the fields was also evaluated by pot experiment. The investigated fields showed higher values of chemical properties than those recommended by Rural Development Administration of Korea(RDA). RDA recommended the optimal ranges as follows; pH 6.0 ~ 6.5, organic matter content 25 ~ 35 g/kg, available phosphate 350 ~ 450 mg/kg, exchangeable K+ 0.7 ~ 0.8 cmolc/kg, exchangeable Ca2+ 5.0 ~ 6.0 cmolc/kg, exchangeable Mg2+ 1.5 ~ 2.0 cmolc/kg, electric conductivity <2.0 dS/m. On the other hand, the ranges evaluated from the values distributed in 75 % fractions of the investigated fields led to the optimal ranges as follows; pH 6.5 ~ 7.2, organic matter content 25 ~ 55 g/kg, exchangeable K+ 0.6 ~ 2.4 cmolc/kg, exchangeable Ca2+ 5.0 ~ 12.0 cmolc/kg, exchangeable Mg2+ 1.5 ~ 3.5 cmolc/kg, electric conductivity 10 cm, hardness of surface soils <20 mm, bulk density 40 %, and clay content >30%. Most of the soils were moderately drained, It seemed that growth was more affected by soil drainage than soil texture. The relationship of soil nitrogen and sulfur contents to those of Chinese chive indicated that the sulfur content of Chinese chive seemed to be proportional to soil available sulfur content up to a value of soil available sulfur content, 70 mg/kg. The effect of sulfur fertilization on growth of Chinese chive suggested that its growth and biomass are optimized at a level of soil available S 300 mg/kg. This study shows that the chemical and physical properties of green house Chinese chive fields need to be further optimized for sustainable high productivity. Although this study proposed the optimal ranges of the physical and chemical properties of green house Chinese chive fields, it is necessary to further optimize them by conducting a variety of related works for sustainable high productivity and quality of green house Chinese chive.
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