Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
권호 표지

Spatial Variability of Soil Moisture Content, Soil Penetration Resistance and Crop Yield on the Leveled Upland in the Reclaimed Highland

고령지 개간지 밭의 토양수분과 경도 및 작물수량의 공간변이성

  • Park, Chol-Soo (Bio-resources group, KT&G Central Research Institute) ;
  • Yang, Su-Chan (Department of Biological Environment, Kangwon National University) ;
  • Lee, Gye-jun (National Institute of Highland Agriculture, RDA) ;
  • Lee, Jeong-Tae (National Institute of Highland Agriculture, RDA) ;
  • Kim, Hak-Min (Department of Biological Environment, Kangwon National University) ;
  • Park, Sang-Hoo (Department of Biological Environment, Kangwon National University) ;
  • Kim, Dae-Hoon (Department of Biological Environment, Kangwon National University) ;
  • Jung, Ah-Yeong (Department of Biological Environment, Kangwon National University) ;
  • Hwang, Seon-Woong (National Institute of Highland Agriculture, RDA)
  • 박철수 (KT&G 중앙연구원 생물자원연구소) ;
  • 양수찬 (강원대학교 자원생물환경학과) ;
  • 이계준 (농촌진흥청 고령지농업연구소) ;
  • 이정태 (농촌진흥청 고령지농업연구소) ;
  • 김학민 (강원대학교 자원생물환경학과) ;
  • 박상후 (강원대학교 자원생물환경학과) ;
  • 김대훈 (강원대학교 자원생물환경학과) ;
  • 정아영 (강원대학교 자원생물환경학과) ;
  • 황선웅 (농촌진흥청 고령지농업연구소)
  • Received : 2006.03.21
  • Accepted : 2006.05.22
  • Published : 2006.06.30
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Abstract

Spatial variability and distribution map of soil properties and the relationships between soil properties and crop yields are not well characterized in agroecosystems that have been land leveled to facilitate more cultivation of the new reclaimed sloping highland. Potato, onion, carrot, Chinese cabbage and radish were grown on the coarse sandy loam soil in 2004. Soil moisture content, soil penetration resistance and crop yield were sampled in the $10m{\times}50m$ field consisted of five plots. Sampling sites of each cultivation plot were 33 for the soil moisture, 11 for the soil penetration and 33 for the crop yield. The results of semivariance analysis, most of models were shown spherical equation. The significant ranges of each spatial variability model for the soil moisture, soil penetration and crop yield were broad as 33-35 meters in the potato cultivation plot, and that in the Chinese cabbage cultivation plot was narrow as 5-6 meters. The coefficient of variances (C.V.) of moisture, penetration and yield were various from 14 to 59 percents in five cultivation plots. The highest C.V. of potato yield was 59 percents, and that of the radish cultivation plot was as low as 14 percents. The required sample numbers for the determination of soil moisture content, soil penetration resistance and crop yield with error 10% at 0.05 significant level were ranged 8-40 for soil moisture, 7-25 for soil penetration and 424-4,678 for crop yield. The variogram and distribution map by kriging described field characteristics well so that the spatial variability would be useful for soil management for better efficiency and precision agriculture in the reclaimed highland.

고령지 경사지에서 모래성분이 많은 사양토 (석비레) 개간지의 토양특성에 대한 공간변이성과 분포도를 작성하여 공간적 변이를 살펴보고자 각각 $10m{\times}50m$의 면적을 가지는 5개의 포장에서 감자, 양파, 당근, 배추, 무를 재배하여 시험을 수행하였다. 각 포장의 조사지점수는 토양수분 33, 토양경도 11, 작물수량 33이었다. Semivariance 분석 결과, 대부분의 모형은 spherical 모형을 따르고 있었으며, 각 모형에 대해 공간적으로 연속성이 인정되는 거리를 나타내는 범위 (range)는 감자재배구에서 33-35 m로 고르게 큰 값을 보였고, 배추재배지는 5-6 m로 모형에 대한 연속성이 낮은 것으로 나타났다. 수분과 경도 및 수량에 대한 변이계수는 14-59%로 다양하였고, 감자수량의 변이계수가 59%로 가장 높았으며, 무재배지의 수분은 14%로 낮았다. 표준편차 5% 유의수준에서 10%의 오차를 가지는 경우를 기준으로 적정시료의 수를 조사한 결과, 필요한 시료수는 수분 8-40개, 경도 7-25개, 수량 424-4,6787개가 필요한 것으로 분석되었다. Variogram과 분포도를 통해 수분과 경도 및 작물수량의 공간적 분포 및 변이성을 쉽게 파악할 수 있으며, 이를 활용한다면 보다 효율적이고 정밀한 토양관리가 가능할 것으로 판단된다.

Keywords

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