Cultivation and Ecophysiology of Rice Plants in the Tropics : V. Yield and yield components of several rice cultivars of India, grown under usual cultural methods

[摘要] The grain yield and the yield components of Indian rice cultivars grown in 1985 wet season were studied. The results revealed that the yield was largely dependent on the number of spikelets per panicle and percentage of ripened grains. The number of spikelets per panicle was not correlated with the number of panicles per hill. One thousand-grain weight, length of panicle and leaf area of the four uppermost leaves seemed to have no significant effect on grain yield. The highest grain yield of 'Vijayamahsuri' among cultivars tested attributed to the greatest number of panicles per hill, a relatively great number of spikelets per panicle and a high percentage of ripened grains. The second highest yield was obtained with 'Sonamahsuri'. Both cultivars showed the same length of panicle as well as the first internode and the lower the internode, the shorter the length with similar tendency. Between two scented cultivars, 'HR 59' produced a higher yield than 'Basmati' at normal planting depth of 8-9 cm, 'Basmati', however, produced higher grain yields when transplanted at a shallow depth (2-3 cm). Although the number of panicles were nearly the same in both scented cultivars, the leaf area was larger in 'HR 59' than in 'Basmati'. Lodging in 'Mahsuri' and 'HR 59' were observed due to the elongation of lower internodes.

[学科分类] 农业科学（综合）

[关键词] Internode;植付けの深さ;Lodging;栽培稲;Oryza sativa L.;収量構成要素;Planting depth;節間;Varietal characteristics;倒伏;Yield component;品種特性