作者：Qiang; MA; Wei; WANG; Hongjie; LI; Xia...nutrientfoliarfertilizercottonphotosyntheticcharacteristicsyielddiseaseindextraceelementssoilenzymeactivity
摘要：[Objectives]The effects of copper-based nutrient foliar fertilizer on photosynthetic characteristics,yield,accumulation and distribution of trace elements in various organs,disease prevention effect and soil enzyme activity were studied,so as to provide a theoretical basis for the application of foliar fertilizers in cotton production.[Methods]Through two years of field experiments,six treatments were set in total,namely spraying water(CK),traditional Bordeaux mixture(BDM),Kocide 2000(KCD),copper-based nutrient foliar fertilizer(CF),iron-copper-based nutrient foliar fertilizer(CFFe),and zinc-boron-copper-based nutrient foliar fertilizer(CFZnB).Randomized block arrangement was adopted.Chlorophyll content in leaves was measured at each growth stage of the cotton.Photosynthetic characteristics of leaves were measured at the peak bolling stage.Plants were sampled at initial boll opening stage.The whole plant was divided into root,stem,leaf and cotton boll parts,in which the total copper,total zinc,total iron contents and accumulations were determined.Soil samples were collected from each plot,followed by the determination of soil enzyme activity.Disease index was investigated at bud,flowering and boll-forming and boll opening stage.[Results](1)Spraying CFFe,CFZnB,CF and KCD could significantly improve chlorophyll content of cotton leaves,and the CFFe treatment had the highest increase up to 13.30%,followed by the CFZnB treatment,which was 11.40%higher than the CK;and photosynthetic rate,stomata conductance and transpiration rate could be improved significantly,and the CFFe treatment showed the highest photosynthetic rate,which increased by 26.35%compared with the CK,followed by the CFZnB treatment,which increased by 17.96%compared with CK;and intercellular CO 2 concentration was significantly reduced.(2)Spraying BDM,KCD,CF,CFFe and CFZnB can significantly increase total copper content and accumulation in various cotton organs(except the total copper content in the stem part of the CFZnB treatment;the CFZnB and CFFe t
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