Effects of Different Planting Patterns on Rice Growth and Selection of Rice Varieties Suitable for Direct Seeding

Abstract

【Objective】Rice seedling transplanting and direct seeding are the most widely used planting methods in Guangdong currently. Exploring the effects of seedling transplanting and direct seeding on rice yield and screening the rice varieties suitable for flooding direct seeding in Guangdong and South China can provide theoretical basis for variety selection and breeding application of direct seeding rice in Guangdong and South China.【Method】Twenty-five rice varieties from Guangdong Province were used as materials to simulate submergence tolerance tests, the growth period, plant height, lodging resistance and yield were measured under two different cultivation modes of seedling transplanting and direct seeding in early and late seasons, and the rice varieties suitable for direct seeding were screened.【Result】The seedling rate of 12 rice varieties, such as Yuexinyinzhan 2, Yuenongsimiao and Yuetaiyouzhan with submergence tolerance reached more than 80%.It was found that the growth period of direct seeding rice was 7-15 d shorter than that of seedling transplanting by analyzing the two cultivation modes of seedling transplanting and direct seeding in early and late seasons. As it showed in the field lodgingresistance phenotype identification, 11 rice varieties had stronger lodging resistance. Yield analysis showed that the yields of direct seeding in early and late seasons were higher than those of seedling transplanting, with an average increase of 0.99 % and 1.25 %, respectively.【Conclusion】Based on the submergence tolerance, lodging resistance and high yield of the tested varieties, 4 varieties including Yuenongsimiao, Yumeizhan, Wushansimiao and Yuteyouzhan were selected to be suitable for direct seeding cultivation pattern in South China.

Keywords

• rice
• planting pattern
• seedling transplanting
• direct seeding
• variety