盛铃期施钾对棉花光合特性及产量的影响

Effects of Applying Potassium Fertilizer at Peak Bolling Stage on Cotton Photosynthesis Characteristic and Yield

在大田条件下,采用中熟杂交棉标杂A1、经杂2号和早熟常规棉豫早06、中棉30品种,研究了盛铃期施钾对其光合特性及产量的影响.结果表明,盛铃期土壤施入氯化钾150 kg.hm-2,可提高棉花盛铃期至初絮期叶片SPAD值和Fv/Fm,Fv/Fo;加大叶片的E和C,提高叶片的Pn;棉花单株结铃数、铃重和衣分均有不同程度提高.施钾与不施钾相比,标杂A1、经杂2号、豫早06和中棉30皮棉产量分别提高2.0%,8.6%,13.0%和11.5%.

The effects of applying potassium fertilizer at peak bolling stage of cotton on the photosynthesis characteristic and yield were studied under filed conditions with middle-season hybrid varieties Biaoza A1, Jingza 2 and short-season normal varieties Yuzao 06, Zhongmian 30. Results show that applying 150 kg·hm^-2 Potassium chloride at peak boiling stage increased SPAD value , maximal PS Ⅱ light energy transformation efficiency（Fv/Fm）, PS Ⅱ potential activity（ Fv/Fo ）, photosynthesis rate（Pn） in leaves of cotton during peak boiling stage to early bolls opening stage, enhanced total bolls per plant , boll weight and lint percentage. Compared with contrastive cotton plants, lint yield of Biaoza A1, Jingza 2, Yuzao 06, Zhongmian 30 in experiment were increased 2.0 %, 8.6 %, 13.0 %, 11.5 % respectively.