Changes in Fe, and Mn Content and Lime Requirement Based on Soil pH Testing in Sweet Persimmon Fields

단감 과원 토양 Fe, Mn 함량 변화와 pH 분석을 통한 석회소요량 추천

  • Lee, Young-Han (Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • Choi, Seong-Tae (Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • Lee, Seong-Tae (Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • Hong, Kang-Pyo (Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • Song, Won-Doo (Gyeongsangnam-do Agricultural Research and Extension Services) ;
  • Lee, Jin-Ho (Department of Bioenvironmental Chemistry, College of Agricultural and Life Sciences, Chonbuk National University) ;
  • Cho, Ju-Sik (Division of Applied Life and Environmental Sciences, Sunchon National University)
  • Received : 2010.09.20
  • Accepted : 2010.10.01
  • Published : 2010.10.30

Abstract

Sweet persimmon yield can be limited by soil pH. This study was performed to rapidly determine the optimal level of lime requirement in sweet persimmon field. Soil chemical properties such as Fe, Mn, and Zn were analyzed soil samples of 31 sweet persimmon fields at Gyeongnam Province every two months from April to October in 2008. The available Fe, Mn, and Zn content were significantly high top soil (76.5 mg $kg^{-1}$ for Fe, 46.1 mg $kg^{-1}$ for Mn, and 16.9 mg $kg^{-1}$ for Zn, respectively), and subsoil (55.5 mg $kg^{-1}$ for Fe, 35.9 mg $kg^{-1}$ for Mn, and 12.3 mg $kg^{-1}$ for Zn, respectively) in April. Furthermore, the Mn content was significantly decreased since April compared to other micronutrients. We found a significant negative correlation between soil pH and lime requirement (r=0.881, $p{\leq}0.001$ for top soil, and r=0.855, $p{\leq}0.001$ for subsoil). We suggest that a conversion factor is -171 top soil pH + 1,148 to lime requirement (kg $10a^{-1}$) for top soil, and -190 subsoil pH + 1,247 to lime requirement (kg $10a^{-1}$) for subsoil in sweet persimmon fields. These results supported that the improvement of lime requirement by soil pH value is necessary to rapidly apply to field, and prevent micronutrients over uptake by persimmon plant.

경남지역 단감 재배지 31개소의 토양 미량성분 변화를 조사하여 기초자료로 활용하고 농가현장에서 pH 분석 값을 적용하여 석회소요량을 신속하게 산출할 수 있는 계산식을 구하였다. 가용성 미량성분 함량의 변화는 4월이 표토에서 Fe 76.5 mg $kg^{-1}$, Mn 46.1 mg $kg^{-1}$, Zn 16.9 mg $kg^{-1}$ 이었고 심토는 Fe 55.5 mg $kg^{-1}$, Mn 35.9 mg $kg^{-1}$, Zn 12.3 mg $kg^{-1}$으로 가장 높았으며 Mn 함량은 4월 이후 지속적으로 감소되었다. 표토의 pH가 높아짐에 따라 Fe 함량은 y=-18.8x+162(r=0.374, $p{\leq}0.001$), Mn 함량은 y=-11.5x+98 (r=0.407, $p{\leq}0.001$)의 고도로 유의적인 부의상관을 나타냈다. 단위면적당 석회소요량 (kg $10a^{-1}$)은 표토의 pH와 y=-171x+1,148 (r=0.881, $p{\leq}0.001$), 심토의 pH는 y=-190x+1,247(r=0.855, $p{\leq}0.001$)의 고도로 유의적인 부의상관을 보였다. 따라서 이러한 산술식을 이용할 경우 농가현장에서 석회소요량을 신속하게 산출하여 토양개량제를 시용할 수 있으며 pH로 인한 양분 불균형을 해소할 수 있을 것으로 기대된다.

Keywords

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