Rice Genomics and Genetics 2025, Vol.16, No.4, 180-198 http://cropscipublisher.com/index.php/rgg 183 Zhejiang Zhijiang Seed Industry. The plant height is about 125 cm and the growth period is early. This variety has large ears and many grains, full grains, good fruit set rate, and has the characteristics of early maturity, high yield, and excellent rice quality. The field is beautiful in maturity, the color is good, and the rice looks bright yellow. The regional demonstration yield per mu can reach more than 750 kilograms. However, due to the high plant type and slightly poor stem elasticity, local tilting or lodging is prone to occur in the later stage when nitrogen fertilizer is sufficient. Therefore, it is necessary to pay attention to controlling the amount of nitrogen fertilizer in the later stage in cultivation to avoid greed for green lodging. "Jiang Liangyou 7901" is suitable for promotion as an early-maturing and high-yield hybrid rice, and can achieve high quality and high yield under the premise of ensuring water and fertilizer management. "Xiushui 1717" (conventional late japonica rice) is a new late japonica rice variety bred by Jiaxing Academy of Agricultural Sciences, which was approved by Zhejiang Province in 2021. The variety has a plant height of about 100 cm, a compact plant type, medium tillering ability, short and upright sword leaves, upright panicles, medium to large panicle type, and high fruit set rate. The whole growth period is about 2 days earlier than the control "Xiushui 134", and the color is good when mature. The field performance is resistant to lodging, the medium stalk is strong, the number of panicles is large, and the yield potential is significant. The average yield per mu is 5.8% higher than the control. The rice appearance quality is medium and the rice quality is good. The disadvantage is that the leaves are slightly thin and the leaf tips are slightly dry during maturity, indicating that the resistance to late season decline is slightly poor. "Xiushui 1717" has a moderate maturity period and good stable yield. It is suitable for single-season late rice planting in Zhejiang Province and has been rated as a high-quality japonicarice variety with promotion potential. "Jiahe 567" (conventional late japonica rice) is a new early-maturing late japonica rice variety bred by Jiaxing Academy of Agricultural Sciences. It passed the Zhejiang Provincial Approval in 2022 (Zheshen Rice No. 2022006). "Jiahe 567" is a semi-dwarf early-maturing variety with a plant height of about 96.5 cm, a compact plant shape, thick stems, and good lodging resistance. The tillering ability is strong, the effective panicles are many, the panicles are large, the total number of grains per panicle is about 160, the fruiting rate is close to 90%, and the thousand-grain weight is about 27 grams. The growth period is about 4 days shorter than that of the control "Xiushui 134". The average yield per mu in the two-year regional trial reached more than 615 kg, an increase of about 10% over the control; the yield per mu in the production trial was 621 kg, an increase of 3.2% over the control. In terms of resistance, it is moderately resistant to rice blast and has strong heat resistance; it is moderately susceptible to bacterial leaf blight and highly susceptible to brown planthoppers. The monitoring and prevention of rice planthoppers need to be strengthened in the field. This variety has no lodging and remains upright even in continuous rainy and typhoon weather. The rice quality meets the national standard for grade 3 high-quality rice, with a high rate of whole polished rice and good transparency of rice grains. "Jiahe 567" has excellent yield and adaptability. In the demonstration, the yield per mu ranked first, with an increase of 15.0% over the control "Xiushui 134". Therefore, it is considered to be a new and superior conventional rice variety with high and stable yield prospects (Ding et al., 2023). In addition to the above varieties, other varieties displayed in the demonstration base have their own highlights, such as "Yongyou 1516", "Jiafengyou 27", "Zhejingyou 4", "Xiuyou 6", "Xiushui 1813", "Xiushui 1926", etc. In the classification comparison, it can be found that the overall plant type of indica-japonica hybrid rice varieties is taller, the number of panicles is larger, and the yield increase potential is outstanding; conventional japonica rice varieties have moderate plant height, good uniformity, and relatively better rice quality and stress resistance. 3 Analysis of Growth Characteristics and Yield Performance 3.1 Plant height, tillering capacity, and effective panicle rate Different types of new rice varieties show obvious differences in plant height and tillering characteristics. Indica-japonica hybrid rice varieties usually have taller plant heights and larger canopies (Xu et al., 2020). For example, the plant height of "Yongyou 33" is about 130 cm, while the plant height of conventional japonica rice
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