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Field Lodging Degree of Rice Varieties according to Nitrogen Application Rate  

박중수 (경기도농업기술원)
이원우 (경기도농업기술원)
주영철 (경기도농업기술원)
김영호 (경기도농업기술원)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.47, no.3, 2002 , pp. 226-235 More about this Journal
Abstract
This experiment was to evaluate lodging characteristics of 35 recommended rice varieties of Kyonggi-do at normal (110 kg N/ha) and hen (220 kg N/ha) nitrogen application rates during 1999 to 2000. At heavy N fertilization rate, varieties that were highly resistant to lodging were Obongbyeo, Daejinbyeo, Naepoongbyeo, Nonganbyeo and Ilpumbyeo. Fourteen varieties including Daeanbyeo were moderately resistant and 11 varieties including Jinbubyeo were susceptible to lodging. The lodging-related characters which showed the highest effect on lodging at lodging degree of 9 were culm length and height of center gravity, culm length at lodging degree of 5, and culm length and the third internode length at lodging degree of 3 or below. The difference in rice yield between normal and heavy nitrogen fertilization rate was within 5% in early-maturing varieties but there was great yield difference in mid- and late-maturing varieties depending on the degree of lodging. Consequently, stable rice yield could be obtained by selecting lodging-resistant varieties and lowering fertilization rate, specially in the paddy field where lodging occurrence is common.
Keywords
rice; rice varieties; lodging resistance; lodging index;
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