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Effects of Compressed Expansion Rice Hull Application and Drip Irrigation on the Alleviation of Salt Accumulation in the Plastic Film House Soil  

Cho, Kwang-Rae (Gyeonggi-do Agricultural Research and Extension Services)
Kang, Chang-Sung (Gyeonggi-do Agricultural Research and Extension Services)
Won, Tae-Jin (Gyeonggi-do Agricultural Research and Extension Services)
Park, Kyeong-Yeol (Gyeonggi-do Agricultural Research and Extension Services)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.39, no.6, 2006 , pp. 372-379 More about this Journal
Abstract
This study was carried out to improve chemical properties of salt-accumulated plastic film house soil. Compressed expansion rice hull was applied at 0, 2.5, 5.0, $7.5Mg\;ha^{-1}$, and drip irrigation was initiated at -33 kilopascals (kPa) of soil water potential and ceased adjusted up to -10 kPa. Another treatment was the application of inflated rice hull at $5.0Mg\;ha^{-1}$ with drip irrigation starting at soil water potential -20 kPa and adjusted to -10 kPa. Lettuce(Lactuca sativa L.) was cultivated at sandy loam soil with $5.1dS\;m^{-1}$ of electrical conductivity (EC). $EC_w$(1:5) of plots treated with $5.0Mg\;ha^{-1}$ of inflated rice hull and irrigated at the point of -20 kPa and -33 kPa of soil water potential was reduced by 26% and 24% less than untreated control plot, respectively. Soil $EC_w$(1:5) has close relationship with $Cl^-$ as well as $NO_3{^-}-N$ and $SO{_4}^{2-}$ in the soil. Total nitrogen in leaf of lettuce was deficient in the earlier growth stage. The yield of lettuce increased by 6% by the application of inflated rice hull of $5.0Mg\;ha^{-1}$ with drip irrigation starting at -33 kPa of soil water potential. It decreased 4% when the drip irrigation was stated at -20 kPa of soil water potential. The amount of water used for irrigation was reduced with the increasing application of inflated rice hull. The watering initiated at the point of -33 kPa was more economical compared with starting at -20 kPa.
Keywords
Salt; Inflated rice hull; Irrigation; Soil water potential; Lettuce;
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