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Influence of Diagnostic Fertilization and Subsoil Breaking on Soil physico-chemical Properties in Direct Seeding of Rice on Flooded Paddy Surface  

Yoo, Chul-Hyun (Honam Agricultural Research Institute, NICS, RDA)
Ryu, Jin-Hee (Honam Agricultural Research Institute, NICS, RDA)
Yang, Chang-Hyu (Honam Agricultural Research Institute, NICS, RDA)
Kim, Taek-Kyum (Honam Agricultural Research Institute, NICS, RDA)
Kang, Seung-Weon (National Institute of Crop Science, RDA)
Kim, Jae-Duk (Honam Agricultural Research Institute, NICS, RDA)
Jung, Kwang-Yong (Honam Agricultural Research Institute, NICS, RDA)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.39, no.6, 2006 , pp. 334-338 More about this Journal
Abstract
This study was conducted to evaluate the effect of improvement of soil physical properties such as deep plowing, subsoil breaking and diagnostic fertilization on the yield of rice and nitrogen-use efficiency in direct seeding on flooded paddy surface of rice. The effects of deep plowing, subsoil breaking and diagnostic application of N, P, K fertilizers, Latex coated urea(LCU), compost, silicate were investigated. The soil physical properties, such as bulk density, hardness and porosity were improved and the content of organic matter and available $SiO_2$ were also increased by deep plowing and subsoil breaking. The amount of $NH_4-N$ in soil was highly increased by diagnostic fertilization and deep plowing at 5th leaf stage. The nitrogen-use efficiency was the highest at the diagnostic application of LCU 70% applied as basal dressing with subsoil breaking. The yield of rice increased by 8% under the diagnostic application of LCU 70% applied as basal dressing with subsoil breaking compared with the conventional application.
Keywords
Direct seeding; Flooded paddy surface; Diagnostic fertilization; Deep plowing; Nitrogen-use efficiency;
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