Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (4): 736-751.DOI: 10.3969/j.issn.1004-1524.2023.04.02

• Crop Science • Previous Articles     Next Articles

Response of grain yield and quality of high quality rice to climate factors at different sowing dates in southeastern Zhejiang Province, China

MA Yihu1(), ZENG Xiaoyuan2, HE Xianbiao1,*(), ZHOU Naidi3,*(), CHEN Jian1   

  1. 1. Institute of Ecological and Environment Sciences, Taizhou Academy of Agricultural Sciences, Linhai 317000, Zhejiang, China
    2. Agricultural Technology Extension Center of Taizhou City of Zhejiang Province, Taizhou 318000, Zhejiang, China
    3. Agricultural Technology Extension Center of Xianju County of Zhejiang Province, Xianju 317300, Zhejiang, China
  • Received:2022-05-16 Online:2023-04-25 Published:2023-05-05
  • Contact: HE Xianbiao,ZHOU Naidi

Abstract:

To determine the suitable sowing dates for high quality rice of different types in Southeastern Zhejiang, a field interval sowing experiment was carried out with indica-japonica hybrid rice Yongyou 1540 and indica hybrid rice Tailiangyou 217. The effects of different sowing dates (Ⅰ-Ⅴstage) on grain yield and its components, growth period, seedling quality, tillering characteristics, population growth rate, dry matter accumulation, and rice quality were studied, and the correlation between grain yield and climatic factors, quality and climatic factors was analyzed. The results showed that the grain yield of Yongyou 1540 and Tailiangyou 217 increased first and then decreased with the delay of sowing date, and the yield potential was 11.54 t·hm-2 for Yongyou 1540 in stage Ⅱ and 9.47 t·hm-2 for Tailiangyou 217 in stage Ⅲ. The change trend of yield components was basically consistent with the yield change. The growth stages of rice were delayed with the delay of sowing date. Sowing-heading period was shortened, whereas heading-maturing stage was extended, and the change of whole growth period varied with cultivars. With the delay of sowing date, the seedling quality, dry matter accumulation, and harvest index increased first and then decreased, while the tiller number increased and the productive tiller percentage decreased, and the population growth rate and the output rate of dry matter of stem and leaf varied with cultivars and growth stages. The sowing date mainly affected the rice milling and appearance quality. Rice quality was improved with the delay of sowing date. The grain yield was significantly or extremely significantly positively correlated with the resources of temperature and sunshine during the full heading-maturing stage, while the quality was closely related to temperature and sunshine resources from the 20th day after full heading to maturing stage. We recommend the best sowing date for Yongyou 1540 could be from May 7 to May 26. The sowing date for Tailiangyou 217 with high yield and relatively high quality could be from May 16 to May 22, while the sowing date for Tailiangyou 217 with high quality and relatively high yield could be from May 23 to May 27.

Key words: southeastern Zhejiang, high quality rice, grain yield, rice quality, sowing date, climatic factor

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