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Effect of Milk Vetch Utilization Rice Cultivation to Reduce Application Amount of Nitrogen at Plowing Time in Paddy Field  

Yang, Chang-Hyu (National Honam Agri. Exp. Sation. RDA)
Yoo, Chul-Hyun (National Honam Agri. Exp. Sation. RDA)
Kang, Seung-Won (National Crop Exp. Sation. RDA)
Han, Sang-Soo (National Crop Exp. Sation. RDA)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.35, no.6, 2002 , pp. 352-360 More about this Journal
Abstract
This study was carried out to find out the effect of Milk vetch(Astragalus sinicus L.) on growth, and yield of rice, physicochemical properties of soil, reduction rate of nitrogen fertilization, and soil improvement under the different plowing time with Milk vetch cultivated in paddy field, plowing at maximum blooming, last blooming, fruiting stages. The fresh weight of Milk vetch at each plowing time of maximum blooming, last blooming and fruiting stage was 22,500, 20,000, $12,500kg\;ha^{-1}$ respectively. Content of total nitrogen at three plowing times was 2.95, 2.66, and 2.47% and the C/N ratio were 15.7, 18.0, and 19.2, respectively. Physico-chemical properties of soil were improved in cultivated milk vetch, the content of T-N. OM and porosity ratio were increased while the content of $P_2O_5$ and bulk density, solidphase ratio were decreased compared to noncultivated milk vetch. Content of $NH_4-N$ in soil was highest plowing at maximum blooming stage and appeared an increasing tendency according to increased nitrogen level. Amount of nitrogen fertilizer by rice was highest plowing at maximum blooming stage and appeared an increasing tendency according to increased nitrogen level. Nitrogen-use efficiency was high in $33kg\;ha^{-1}$ nitrogen level at three plowing times. The number of spikelets per $m^2$ was high in plowing at maximum blooming stage, last blooming stage and the percentage of ripeness was high in fruiting stage of milk vetch. So the rice yield was increased 9%, 8% in $55kg\;ha^{-1}$ nitrogen level plowing at maximum blooming stage, last blooming stage and 1% in $77kg\;ha^{-1}$ nitrogen level plowing at fruiting stage compared to conventional cultivation.
Keywords
Milk Vetch; Green manure; Nitrogen Fertilization Rate; Plowing Time; Paddy Field;
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