Relationship of agroclimatic parameters to high density grain production [India]
1987
Rao, S.P. (Directorate of Rice Research, Rajendranagar, Hyderabad 500030, A.P. (India))
Production of high density (HD) grains differs with crop duration, season, and N levels. It was found that HD grain index (% of fully filled grain of 1.18 specific gravity divided by spikelets per panicle) is influenced positively by crop duration and season and negatively by N level. Long-duration varieties IET5656, Mahsuri, CR1009, and Pankaj had higher HD grain indexes than the short- and medium-duration varieties. A similar trend was found when these varieties were tested under the different climatic conditions of the All India Coordinated Rice Physiology program. Short- and medium-duration varieties performed better in the dry season (65% HD grains) than in the wet season (45-55%). HD grains had a negative relationship with higher N levels in the field. However, higher N levels resulted in higher production of tillers, panicles, and spikelets, and higher leaf area index and total dry matter. Those overall increased yie1635lds were attributed to other yield compone
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