Characteristics of Tillering affected by Changes of Nitrogen Absorption and Assimilation in Dasanbyeo, a Tongil-Type High Yielding Rice Cultivar
2008
Kim, D.S. (National Institute of Crop Science, RDA, Suwon, Republic of Korea), E-mail: [email protected] | Choi, K.J. (National Institute of Crop Science, RDA, Suwon, Republic of Korea) | Kim, S.L. (National Institute of Crop Science, RDA, Suwon, Republic of Korea) | Song, J. (National Institute of Crop Science, RDA, Suwon, Republic of Korea) | Jeong, E.G. (National Institute of Crop Science, RDA, Suwon, Republic of Korea) | Shin, J.C. (National Institute of Crop Science, RDA, Suwon, Republic of Korea) | Suh, S.J. (National Institute of Crop Science, RDA, Suwon, Republic of Korea)
In Korean high yielding varieties developed by crosses between indica and japonica rice, the most limiting factor for yield increase may be attributed to the less number of the tillers in the unit area. The goals of this study is to find out the effect of the environmental factors as well as cultivation practice on the development and increase of tillers of Dasanbyeo, the high yielding indica/japonica hybrid cultivar. The effect of temperature was examined in the controlled phytotron condition with 6 different temperatures, 15, 18, 22, 24, and 27℃, respectively. For all the experiment, the leading japonica variety in Korea, Hwaseongbyeo, was used for the check cultivar for the comparison with Dasanbyeo. Hwaseongbyeo showed a higher responses of tiller increase to the increased nitrogen rates then Dasanbyeo with the increase ratios of 2.1-24.6% for the latter, and 26.8-61.5% for the former. The nitrogen absorption of both the cultivars was increased with the increase of temperature up to 24℃, although the less absorption at 27℃ than at 24℃ was also observed. When Dasanbyeo was grown at 15℃ to be shifted to higher temperature, no absorption increase was found, while after growing 22℃ to be shift to higher temperature, the increased absorption rate was observed. Dasanbyeo showed a lower assimilation rate in unit area, although assimilation rate per plant showed different tendency. At low temperature range of 15-18℃, Dasanbyeo had a lower assimilation rate than Hwaseongbyeo at the temperature range of 22-24℃ while, the vice versa was observed at higher temperature range of 27℃.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Korea Agricultural Science Digital Library