不同追肥时期对花生光合特性及产量的影响

为了揭示不同追肥时期对花生光合特性及产量的影响，在田间试验条件下，选择花生品种‘青花5号’为材料，对不同追肥时期花生叶面积指数、叶绿素含量、光合速率、产量和产量构成因素等指标的变化进行研究。结果表明：花针期追肥可提高花生叶面积指数，叶面积指数在3以上所持续的时间达到30天以上；功能叶片叶绿素含量保持较高水平；功能叶片净光合速率明显提高；单株结果数显著增加3.5个，果重提高9.7%，从而使花生的经济产量提高9.33%。在花生生产上花针期追肥可作为提高产量的一项技术。

Effect of Different Top-dressing Times on Photosynthetic Physiological Properties and Yield of Peanut

In order to investigate the effects of different top dressing time on photosynthetic physiological properties and yield of peanut, a field trial with cv. Qinghua 5 was conducted in Laiyang, Shandong, China in 2009-2010 to explorc the best top dressing stage and to study the changes of LAI （leaf area index）, SPAD value, photosynthetic rate and yield components. The fertilizer applied at flower-pegging stage could increase LAI significantly, compared to the control without top dressing. Meanwhile, the duration of LAI 〉3 was more than 30 days, the SPAD value of functional leaves maintained higher level, the photosynthetic rate of functional leaves improved significantly, the pod numbers of single plant increased by 3.5, pod weight increased by 9.7%, and thus making ecorlomic yield increase by 9.33%. It was concluded that the fertilizer application at the flowering-pegging stage might be used as a technology on increasing the economic yield of peanut.