Rice Genomics and Genetics 2025, Vol.16, No.4, 180-198 http://cropscipublisher.com/index.php/rgg 192 "Jiangliangyou 7901" has golden husk color, good transparency, and good rice appearance quality and taste, reaching the second-level quality level in Zhejiang Province's quality inspection. According to feedback from the grain department, 7901 has high polished rice rate and whole polished rice rate, which is a combination of high yield and high quality. The rice quality of both varieties is better than that of conventional japonica rice main varieties, which has a positive effect on improving grain quality (Ding et al., 2023). In terms of cultivation points, "Yongyou 33" requires attention to planting enough basic seedlings in the early stage, reasonable density planting, and control of nitrogen in the middle and late stages to prevent greed, and pay attention to timely prevention and control of borers and planthoppers; "Jiangliangyou 7901" emphasizes timely early sowing, appropriate seedling age, and not too much tillering fertilizer. In principle, no nitrogen is applied after jointing to prevent lodging in the later stage. Based on the demonstration experience, the "one control and two promotions" management strategy for "Yongyou 33" has a better effect, that is, controlling nitrogen and density, promoting tillering and strong stalks, and promoting flowering and grain fertilizer; for Jiangliangyou 7901, the "front promotion, middle control, and back protection" strategy is adopted, that is, promoting tillering in the early stage, controlling fertilizer and water in the middle stage, and protecting filling and leaf functions in the late stage. In general, "Yongyou 33" and "Jiangliangyou 7901", as excellent representative varieties of indica-japonica hybrid rice, have demonstrated the characteristics of high yield, high quality, and wide adaptability. However, "Yongyou 33" is more inclined to stable yield and stress resistance, which is suitable for the pursuit of stable yield and complex climatic conditions. Jiangliangyou 7901 has higher yield potential and better rice quality, but has relatively strict requirements for cultivation and management. In actual promotion, the corresponding varieties can be selected according to regional production conditions and management level. For example, in areas prone to high temperatures and with high planting levels, "Yongyou 33" performs more reliably; in areas with early-maturing planting systems and the pursuit of the highest yield and rice quality, "Jiangliangyou 7901" can play a greater role, but it needs to be well managed in the later stage of the field. The successful application of the two reflects the different breeding ideas and adaptability of modern hybrid rice varieties, and has positive significance for enriching rice varieties and ensuring food production security. 6.2 Demonstration results of conventional rice "Xiushui 1717" and "Jiahe 567" Among conventional late japonica rice varieties, "Xiushui 1717" and "Jiahe 567" are the two highlight varieties of this demonstration. They represent different types of new conventional rice varieties in Jiangsu and Zhejiang: the former has moderate maturity, stable yield and resistance to lodging, and the latter has early maturity, high yield and excellent comprehensive traits. In terms of yield, "Xiushui 1717" yielded about 664.1 kg per mu in the demonstration, an increase of 5.8% over the control "Xiushui 134", and the yield level was in the upper middle among conventional rice. "Jiahe 567" performed particularly well, with an output of 721.5 kg per mu, an increase of 15.0% over the control, and the increase in yield ranked first among conventional rice. The yield of Jiahe 567 is even close to the level of general hybrid rice, showing that conventional rice also has high production potential after genetic improvement (Ding et al. 2023). In terms of growth period, "Xiushui 1717" is a medium-early variety with a full growth period of about 152 days, which is 3-4 days shorter than the control; "Jiahe 567" is even earlier, with a full growth period of about 148 days, which is 4 days shorter than the control. "Jiahe 567" is usually sown in late May, with full ears at the end of August and mature at the end of October. The early maturing characteristics are conducive to avoiding low temperatures in late autumn and reducing the risk of maturity. In terms of lodging resistance, both varieties have inherited the fine tradition of lodging resistance of Xiushui and Jiahe series. "Xiushui 1717" has a moderate plant height (102 cm), thick and elastic stems, and shows good lodging resistance in windy and rainy environments. Although "Jiahe 567" has many tillers and large panicles, it rarely lodges due to its short stalks (96 cm) and high stalk strength. During the typhoon and heavy rain in Zhejiang in September 2021, there were almost no lodged plants in the "Jiahe 567" field. It can be seen that both varieties meet the requirements of large-scale mechanical harvesting. In terms of disease and insect resistance, the approved data of "Xiushui 1717" is moderately resistant to rice blast, mild sheath blight, and good heat resistance during the heading stage; no obvious disease epidemic was observed in the field, and only mild premature aging of the leaf tips occurred. "Jiahe 567" has good overall resistance, moderate resistance to rice blast at the neck, and
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