长期定位施肥对夏玉米光合性状及产量的影响

基于 30年的长期定位试验, 研究了长期定位施肥对夏玉米光合性状及产量的影响。研究结果表明：随着施肥量的增加，玉米穗位叶叶绿素含量，光合速率，干物质积累量都显著提高。有机肥与氮肥配施的处理与偏施氮肥的处理相比，各项指标提高最为显著。长期不施肥，玉米的穗粒数最低偏施氮肥可以提高穗粒数，但与对照差异不显著，有机肥与氮肥配施可以显著提高小麦的穗粒数，产量较高，高有机肥与高氮肥配施的处理产量最高。

he effect of the long-term located fertilization on summer maize photosynthetic characteristics and yield

The effect of the fertilization on maize photosynthetic characteristics and yield was studied on the basis of a long-term fertilization trial. the results indicated that: fertilizer significantly increased chlorophyll and photosynthetic in spike leaf of maize, dry matter accumulation as compared with the non-fertilizer treatment. The long-term combined application of organic and N fertilizer treatment increased chlorophyll and photosynthetic in spike leaf of maize obviously, compared with single N treatment, so increased the dry matter accumulation. The long-term non-fertilizer treatment reduced grains per spike ,the single N treatments can increased grains per spike, but not significantly as compared with the non-fertilizer treatment. The organic and combine application of organic and N fertilizer treatment increased grains per spike ,so the yield was higher. The yield of combined application of higher organic and higher and fertilizer treatment was highest.