Effects of Partial Spraying of Plant Growth Regulator on Canopy Structure, Chlorophyll Fluorescence Characteristic and Yield of Summer Maize (Zea mays L.)

doi:10.7668/hbnxb.2011.03.028

Abstract

Abstract: Canopy structure has strong effects on chlorophyll fluorescence characteristic and grain yield in maize(Zea mays L.) production.In this paper,the effects of partial spraying of plant growth regulator(PGR),which was sprayed at initial stage of stem elongation at intervals of three lines,were studied on canopy structure,chlorophyll fluorescence parameters and yield characters using a half-compact maize variety,Jinhai 5.The results showed that the plants sprayed PGR had lower plant heights,shorter lengths of internodes under ear,longer lengths of internodes above ear and thicker diameters of basal stems.Therefore,compared to the control plants,a′waving′ canopy was shaped in the treatment sprayed PGR partially.It is found that the ′waving′ canopy could obviously improve light permeating conditions in the middle and lower layers,increase leaf area index and hold longer duration,keep higher chlorophyll content,PS Ⅱ potential activity(Fv/Fo) and chloroplast PS Ⅱ photochemical efficiency,and result in an increase of ear number per area,100-grain weight and yield.

Key words: Partial spraying, 'Waving' canopy, Leaf area index, Percent transmission, Chlorophyll fluorescence parameters, Yield

CLC Number:

S513.01

BIAN Da-hong, ZHANG Rui-dong, DUAN Liu-sheng, LI Jian-min, LI Zhao-hu. Effects of Partial Spraying of Plant Growth Regulator on Canopy Structure, Chlorophyll Fluorescence Characteristic and Yield of Summer Maize (Zea mays L.)[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2011, 26(3): 139-145. doi: 10.7668/hbnxb.2011.03.028.

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