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Reasonable Split Application Method of Nitrogen Fertilizer for Early Dry Seeding Culture of Rice in Honam Plain Area  

Kim, Sang-Su (Honam Agricultural Research Institute, NICS)
Choi, Weon-Young (Honam Agricultural Research Institute, NICS)
Back, Nam-Hyun (Honam Agricultural Research Institute, NICS)
Choi, Min-Gyu (Honam Agricultural Research Institute, NICS)
Park, Hong-Kyu (Honam Agricultural Research Institute, NICS)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.40, no.6, 2007 , pp. 460-464 More about this Journal
Abstract
This study was carried out to elucidate the proper split application method of nitrogen fertilizer for early dry seeding culture of rice in Honam plain area from 1997 to 1998 in Korea. Dongjinbyeo was selected as rice variety for this experiment. The rate of $160kg\;ha^{-1}$ of nitrogen was split as 40-30-30% of total nitrogen at three different application time combination ; T1) basal-5th leaf-panicle formation(PF) stage, T2) 3rd leaf-5th leaf-PF, and T3) 3rd leaf-7th leaf-PF. The content of $NH_4-N$ in soil at 5th leaf stage was higher in top dressing plots(T2, T3) compared with basal application(T1), at 7th leaf stage it was most in top dressed at 3rd leaf and 5th leaf stage, but there was no difference at heading stage. Amount of nitrogen uptake and nitrogen use efficiency was higher in the order of T3, T2 and T1(basal application). Spikelet number per unit area was more in the order of T3, T2 and T1, but rate of ripened grain and 1,000 grain weight were not significantly different among three nitrogen split application methods. Milled rice yields were higher in top dressed plots compared with basal nitrogen application plots. From the results of this experiment, reasonable nitrogen split application method for early dry seeding culture of rice could be 40-30-30% of total nitrogen at 3rd leaf, 7th leaf and panicle formation stage.
Keywords
Rice; Early dry-seeding; Nitrogen use efficiency; Growth; Yield;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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