Analyzing on the Optimum Direct-sowing Date for Yongyou15 Rice Variety in Zhejiang Region

doi:10.3969/j.issn.1000-6362.2019.01.004

Abstract

Abstract:

To reveal the impacts of sowing date on dry matter accumulation and yield composition of direct seeding rice, an experiment with five sowing dates was conducted at the agrometeorological experimental station of Longyou in Zhejiang province in 2017, in which the rice variety of Yongyou15 was used. The five sowing dates were May 5 (denoted as A1), May 15 (denoted as A2), May 25 (denoted as A3), June 4 (denoted as A4) and June 14 (denoted as A5). During the experiment, the leaf area index (LAI), photosynthetic production, dry matter accumulation and transfer, and the characteristics of rice yield were observed and analyzed to examine their relationships with sowing dates. The results showed that under the optimum sowing date (A2), the LAI, the photosynthetic potential, the growth rate of the rice were higher than that of other sowing dates. The output and conversion rates of the dry matter accumulation were also higher. The dry matter output of A2 was 7.87%, 15.29%, 49.43% and 56.43% higher than that of A1, A3, A4 and A5 respectively. The matter conversion rate of A2 was 5.59%, 13.18%, 28.60% and 39.83% higher than that of A1, A3, A4 and A5 respectively. Compared with the optimum sowing date (May 25) of local single cropping of late rice, proper early sowing could increase the effective panicle number, seed setting rate and grain number per panicle which finally contribute to the rice yield of direct-sowing rice. As a result, the yield of A2 reached 8879.70kg·ha-1, about 392.10, 610.20, 1445.85 and 2085.15 kg·ha-1 higher than that of A1, A3, A4 and A5 respectively. It concluded that the optimum sowing date of Yongyou 15 with direct-sowing cultivation in Longyou region is in the middle of May. Earlier or later planting (in early May or late May) may lead to a decline in rice production, sowing in June or even later could result in a significant decrease in the final yield.

Key words: Direct-seeding rice, Sowing date, Photosynthetic potential, Dry matter accumulation, Yield

JIANG Xiao-dong, LV Run, JING Zhi-feng, MAO Zhi-jun, LI Jian-ye, YANG Shen-bin, GUO Jian-mao. Analyzing on the Optimum Direct-sowing Date for Yongyou15 Rice Variety in Zhejiang Region[J]. Chinese Journal of Agrometeorology, 2019, 40(01): 33-40.

References

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