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Effect of Reduced Fertilization Considering Residual Soil Nutrients on Rice Yield and Salt Removal in Greenhouse Vegetables and Rice Cropping System  

Jeon, Weon-Tai (National Institute of Crop Science, RDA)
Park, Hyang-Mi (National Yeongnam Agricultural Institute, NICS, RDA)
Chung, Joung-Bae (Division of Life and Environmental Science, Daegu University)
Park, Ki-Do (National Yeongnam Agricultural Institute, NICS, RDA)
Park, Chang-Young (National Yeongnam Agricultural Institute, NICS, RDA)
Yang, Won-Ha (National Institute of Crop Science, RDA)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.38, no.2, 2005 , pp. 85-91 More about this Journal
Abstract
Nutrients are built up in paddy soils after greenhouse vegetable cultivations with relatively high rates of chemical fertilizers and composts during winter season, and the continuous nutrient accumulation is problematic in crop cultivation. Rice cultivation after greenhouse vegetables is one option for removing the accumulated nutrients in the soils. The object of this experiment was to examine the effect of reduced fertilization to rice on the removal of accumulated soil nutrients and rice yield in greenhouse vegetables and rice cropping system. Experiments were carried out at Changwon and Uiryeong in Gyeongnam province in 2001. The cropping systems were watermelon-rice and pumpkin-watermelon-watermelon-rice in Changwon and Uiryeong, respectively. The soils were Gangseo series (coarse loamy, mixed, nonacid, mesic family of Aquic Fluventic Eutrochrepts) at Changwon and Hampyeong series (fine loamy, mixed, mesic family of Fluvaquentic Dystrochrepts) at Uiryeong. Treatments of conventional fertilization ($N-P_2O_5-K_2O=11-4.5-5.7$, $kg\;10a^{-1}$), no basal fertilization, no top dressing, and no fertilization were included in the experiments. Plant growth and total nitrogen content in the plant were greater as the amount of fertilizer applied were increased. Whereas $SiO_2/T-N$ rate in rice plant and nitrogen use efficiency were greater as the amount of fertilizer applied were reduced. Rice yields were not significantly different among the treatments of conventional, no top-dressed, and no-basal fertilization in Uiryeong, and the rice yields were significantly also not different between the treatments of conventional and no top-dressed in Changwon. The removal of salts in soils after rice cultivation was the highest at the treatment of no-basal fertilization in both of the sites. Therefore, reduced fertilization for rice cultivation after greenhouse vegetables could remove salts accumulated in paddy soils without any significant reducing of rice yield.
Keywords
Rice; Greenhouse vegetable; Salt removal; Reduced fertilization; Cropping system;
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