成都平原超级稻超高产群体产量形成与物质生产特点研究

对Ⅱ优602、德香4103、Q优8号等3个超级稻品种不同产量级别群体的产量形成及干物质生产特点进行了研究。结果表明,超级稻品种从中产(产量≤9.0 t/hm2)实现高产(产量9.0~10.5 t/hm2)关键在于每穗粒数提高后库容的增大,并同时提高结实率;而要实现超高产(产量≥10.5 t/hm2)则有赖于大库条件下结实率的进一步提高。此外,超级稻品种产量分别与分蘖临界期后各阶段的干物质积累量存在显著或极显著的正相关关系,超级稻品种高产群体获得高产的关键是提高抽穗后物质生产能力,而要进一步实现超高产则需要抽穗前后干物质生产能力的协同提高。

Study on Yield Formation and Matter Production Characteristic of Super-high Yield Popu- lation of Super Rice in Chengdu Plain

The yield formation and matter production characteristics of super-high yield population of super rice varieties lI -You 602, dexiang 4103, Q-You 8 were studied. The results showed that increasing the seed setting percentage and storage-capacity was very important for super rice from medium yield （less than or equal to 9.0 t/hm2） to high yield （from 9.0 t/hm2 to 10.5 t/hm2） following the grain per ear improved. However, the realization of super-high yield （greater than or equal to 10.5 t/hm2） depended on the further in- creasement of seed setting percentage under the condition of great sink capacity in super rice. Additionally, the yield of super rice was positively correlated with the matter accumulation amount of different growth stages after the tillering stage, respectively. The key to attain the high yield of super rice was to enhance the capacity of matter production after the heading stage, and it＇s essential to increase the matter production in the heading period for achieving the super-high yield of super rice.