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Annul Variation of Soil Properties and Yield of Soybean in Paddy Field  

Kim, Min-Tae (National Institute of Crop Science, RDA)
Seo, Jong-Ho (National Institute of Crop Science, RDA)
Cho, Hyeoun-Suk (National Institute of Crop Science, RDA)
Seong, Ki-Yeong (National Institute of Crop Science, RDA)
Lee, Jong-Ki (National Institute of Crop Science, RDA)
Eom, Sun-Pyo (National Institute of Crop Science, RDA)
Jeon, Weon-Tai (National Institute of Crop Science, RDA)
Lee, Jang-Yong (National Institute of Crop Science, RDA)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.52, no.4, 2007 , pp. 370-374 More about this Journal
Abstract
This study was carried out to investigate the soil chemical and physical properties by annul variation and yield properties according to cropping rotation system of paddy field which was cultivated rice and soybean of each 1 year by turns, each 2 year by turns, 1 year of rice and 3 years of soybean and 4 years of soybean continuously. This study was conducted for 3 years from 2002 to 2004 in National Institute of Crop Science(NISC), Korea. Study was controlled by Shinpaldal 2 of midmatured species, sow a field with soybean by $60{\times}15cm$ in 27 May. Chemical fertilizer was spread in the field by N 3.0 kg, $P_2O_5 $ 3.0 kg, $K_2O$ 3.4 kg per 10a. This experiment was carried for increase the degree of self sufficiency of soybean from detect the better cropping system in paddy field. The results of the study were as follows; Soil prosity was increased 17.4% in each one year rotation and 21.8% in the sector of cultivated soybean for four years. Results was indicated that $5{\sim}9cm$ of stem length, $0.5{\sim}1.0ea$ of branch number and $3.5{\sim}7.0$ of SPAD value was decreased in the sector of cultivated soybean for $3{\sim}4$ years compared to $1{\sim}2$ year cultivated sector. The soybean yield was reduced 12.9%(222 kg/10a) in the 2 year cultivated sector and 21%(201 kg/10a) in the 3 year cultivated sector compare with paddy-upland switching cultivation(255 kg/10a). Root nodule weight and number was tend to decrease according to the increasing duration of cultivated soybean.
Keywords
soybean; cropping system; paddy field; yield; root nodule;
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