香稻专用肥对香稻光合物质生产特征的影响

Effects of special fertilizer for aromatic rice on characteristics of photosynthesis and matter production of aromatic rice

【目的】探明香稻专用肥对香稻光合物质生产特征的影响.【方法】设置施用香稻专用肥与常规施肥2个处理,以常规香稻品种桂香占、农香18、象牙香占和美香占为材料进行大田对比试验,对不同施肥处理间的香稻SPAD值、叶面积指数、净光合速率、光合势、群体生长率、干物质积累量、收获指数和稻谷产量等进行系统的比较研究.【结果和结论】与常规施肥比较,香稻专用肥显著提高了4个香稻品种生育后期的SPAD值、叶面积指数、净光合速率和干物质积累量.香稻专用肥处理的收获指数和稻谷产量普遍高于常规施肥处理,其中桂香占、象牙香占和美香占的稻谷产量显著高于对照,增产达16.46%-22.33%.香稻专用肥处理的香稻品种光合生产能力在生育后期优势明显,香稻专用肥促进了香稻后期的物质生产和积累,最终使香稻产量得到提高。

【Objective】To investigate the effects of special fertilizer for aromatic rice on characteristics of photosynthesis and matter production of aromatic rice. 【Method】A field contrast experiment was conducted with four conventional aromatic rice cultivars,Guixiangzhan,Nongxiang 18,Xiangyaxiangzhan and Meixiangzhan,to evaluate the effects of special fertilizer for aromatic rice（ SF） and conventional fertilizer（ CK） on relative chlorophyll content（ SPAD）,leaf area index（ LAI）,net photosynthetic rate,photosynthetic potential,crop growth rate,dry matter accumulation of population,harvest index and grain yield.【Result and conclusion】The results showed that compared with CK,special fertilizer for aromatic rice could significantly increase SPAD,LAI,net photosynthetic rate and crop growth rate of four aromatic rice cultivars at the later growth stage. SF could generally improve harvest index and grain yield,including a significant yield increase of Guixiangzhan,Xiangyaxiangzhan and Meixiangzhan,an increase of16. 46%- 22. 33%. The capacity of photosynthesis and matter production of aromatic rice cultivars at the later growth stages under SF have obvious advantages,and SF promotes the matter production and accumulation. Therefore,the grain yield increases.