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对Y两优6号和Y两优900这2个杂交水稻品种的穂肥施用期进行了研究,结果表明:2个品种之间差异较小,穂肥施用期对各处理水稻的SPAD值、净光合速率和物质转运具有一定影响。抽穗至成熟期,处理E的SPAD值下降速度最慢,且在成熟期保持最高数值;净光合速率在处理D下降幅度最小,但在成熟期处理E处数值最高;Y两优900在处理D成熟期茎鞘物质输出率最低,Y两优6号在处理D成熟期茎鞘物质出现增重现象,说明2个品种在处理D中茎鞘物质没有被充分利用。Y两优6号产量与净光合速率和SPAD值呈显著正相关;Y两优900产量与净光合速率呈极显著正相关,与SPAD值呈显著相关;2个品种产量与茎鞘输出率和转换率负相关。与其他处理相比,孕穗6期施穂肥有利于延缓叶片衰老,提高净光合速率,以积累更多的光合产物。
The results showed that there was little difference between the two hybrid rice cultivars Y Liangyou 6 and Y Liangyou 900. The results showed that there was no significant difference between the two cultivars in terms of SPAD, Net photosynthetic rate and substance transport have a certain impact. From heading to maturity, the SPAD value of treatment E slowed down the most and maintained its highest value at maturity; the net photosynthetic rate decreased the least in treatment D, but had the highest value in treatment E at maturity; The yield of stems and sheaths was the lowest in mature stage. The weight gain of stems and sheaths appeared in Y Liangyou 6 at D ripening stage, which indicated that the stems and sheaths of two cultivars were not fully utilized in treatment D. The yield of Y Liangyou 6 had a significant positive correlation with the net photosynthetic rate and the SPAD value. The yield of Y Liangyou 900 was significantly and positively correlated with the net photosynthetic rate and significantly correlated with the SPAD value. The yield of two varieties was significantly correlated with the yield of stem and sheath and The conversion rate is negatively correlated. Compared with other treatments, booting fertilizer 6 booting was beneficial to delay leaf senescence, increase net photosynthetic rate and accumulate more photosynthetic products.