• Title/Summary/Keyword: crop density

Search Result 779, Processing Time 0.044 seconds

Analysis of the Crop Damage Area Related to Flood by Climate Change Using a Constrained Multiple Linear Regression Model (구속 다중선형회귀 모형을 이용한 기후변화에 따른 농작물 홍수 피해 면적 분석)

  • Kim, Myojeong;Kim, Gwangseob
    • Journal of The Korean Society of Agricultural Engineers
    • /
    • v.62 no.2
    • /
    • pp.1-15
    • /
    • 2020

  • In this study, the characteristics of crop damage area by flooding for 113 middle range watersheds during 2000-2016 were analyzed and future crop damage area by flooding were analyzed using 13 GCM outputs such as hourly maximum rainfall, 10-min maximum rainfall, number of days of 80 mm/day, daily rainfall maximum, annual rainfall amount associated with RCP 4.5 and RCP 8.5 scenarios and watershed characteristic data such as DEM, urbanization ratio, population density, asset density, road improvement ratio, river improvement ratio, drainage system improvement ratio, pumping capacity, detention basin capacity, and crop damage area by flooding. A constrained multiple linear regression model was used to construct the relationships between the crop damage area by flooding and other variables. Future flood index related to crop damage may mainly increase in the Mankyung watershed, Southwest part of Youngsan and Sumjin river basin and Southern part of Nackdong river basin. Results are useful to identify watersheds which need to establish strategies for responding to future flood damage.

  • https://doi.org/10.5389/KSAE.2020.62.2.001 인용 PDF KSCI

Effect of PE Film Mulching and Planting Density on Growth and Tuber Yield in Yacon(Polymina sonchifolia POEPP) (재식밀도와 비닐피복이 야콘의 생육 및 수량에 미치는 영향)

  • 신동영;이영만;김학진
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.38 no.3
    • /
    • pp.240-244
    • /
    • 1993

  • Yacon(Polymina sonchifolia POEPP), an indigenous Andean natural resource food plant, was imported as a new root crop from New Zealand in 1986. However the chemical composition and planting system of it have not been research in Korea. The experimental results for the optimum planting densities and mulching effect are as follows. Height of the main stem of yacon was grown linear from July to October, is showed more fast growth as density increased, and showed highest in 70 ${\times}$ 55cm density. The tiller was bubed 3 month after planting but there was no significant difference among mulching, non-mulching condition and planting density. The fresh weight of root of mulching condition was heavier than that in non-mulching condition and 70 ${\times}$ 40cm mulching condition. In mulching treatment, number of roots in dense planting were more than that in sparse planting. The effect of mulching was not shown significantly in root diameter and root length.

  • PDF