Changes of Nutrients Content and Natural Supplies by Irrigation Water during the Rice Cultivation

논 관개수중 영양물질의 함량변화와 천연공급량

  • Han, Kang-Wan (Dept. of Agricultural Chemistry, Chonbuk National University) ;
  • Chon, Jae-Chul (Dept. of Agricultural Chemistry, Chonbuk National University) ;
  • Cho, Jae-Young (Dept. of Agricultural Chemistry, Chonbuk National University) ;
  • Kim, Seong-Jo (College of Life and Natural Resources, Wonkwang University)
  • Published : 1997.12.30

Abstract

Changes of nutrient material and heavy metals of irrigation water and natural supplies by irrigation water into 1.0ha of paddy field during the rice cultivation was investigated pH of irrigation water ranged 6.45${\sim}$8.34 and electrical conductivity showed $110{\mu}S/cm$ in the first irrigation period and commonly showed $90{\mu}S/cm$. The content of T-N, NH4-N and $NO_3-N$were 3.09${\sim}$12.36, 0.17${\sim}$1.34 and 2.70${\sim}$10.72mg/L respectively. The content of T-P was 0.09${\sim}$0.22mg/L and ortho-P was not detected. The content of $Ca^{++},\;Mg^{++},\;Na^+\;and\;K^+$ showed 0.89${\sim}$5.12, 1.12${\sim}$2.76, 1.74${\sim}$4.52 and 1.34${\sim}$4.18mg/L regardless of irrigation season respectively. Only Cu and Zn of heavy metals were detected 0.001${\sim}$0.009 and 0.007${\sim}$0.091mg/L, but Pb, Cd, Cr and Ni were not detected When supplied 4,250m^3 of an irrigation water into 1.0㏊ of paddy field, natural supplies of nutrient materials were 29.67㎏ of T-N, 1.80㎏ of $NH_4-N$, 24.57kg of NO3-N and 0.51kg of T-P. Also $Ca^{++},\;Mg^{++},\;Na^+,\;K^+,\;Cl^-\;and\;SO_4\;^{2-}$ were supplied 9.42, 7.09, 13.34, 9.08, 40.27 and 41.38kg respectively. Only Cu and Zn of heavy metals were supplied 0.017kg of Cu and 0.133kg of Zn, Pb, Cd, Cr and Ni were not supplied

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