Seasonal variation in dry matter production of hybrid rice in Changsha, China.
1989
Yan F. | Li F.
Seedling dates for three hybrid rice combinations, Wei-You 35 (early maturity), Wei-You 6 (late maturity), and Shan-You 6 (late maturity), were studied in 1982 and 1983. Seeding began 1 Apr and continued at 10-d intervals for 10-12 plantings. The net assimilation rate of the hybrids gradually declined as plants developed. It was higher in Wei-You 35 than Wei-You 6 at all stages in 1983. Optimum seeding times were identified by dry matter production, grain yield, productivity, and rate of solar energy use. The caloric value of dry matter was higher in Wei-You 6 than in Wei-You 35. Net assimilation rate and solar energy use rate of Wei-You 6 were lower than those of Wei-You 35. The highest potential grain yield for late rice was in the second optimum seeding time. The two optimum seedling times under the inland-monsoon humid climate in Changsha [China] are early April and mid-June for late-maturing combinations, and early April and early July for early-maturing combinations. Late summer to early autumn, with high temperature and low humidity, might not be safe for hybrid rice.
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