Effects of Removing Redundant Organs on Yield Formation of High-yielding Summer Maize

doi:10.7668/hbnxb.2015.04.023

Abstract

Abstract: In the light of the actual conflict between "population" and "individual quality" on increasing the maize yield,during summer maize seasons from 2013 to 2014 (June-early October) a field experiment was conducted to study the effects of removing redundant organs on yield and photosynthesis of high-yielding summer maize,and the objectives of this study was to search out a new method to harmonize the relationship between maize "population" and "individual quality",conventional maize planting as control.The results showed that removing tassel and lower leaves increased the net photosynthetic rate and maximum grain-filling rate,and promoted matter transport from vegetative organs to grains.Tassel removal could improve light distribution in canopy.Lower leaves removal may prolong grain-filling period and decrease water consumption or relief water-stress in dry year.Compared with the control,in 2013(rainy year)tassel removal,leaves removal and tassel & leaves removal could increase grain yield by 12.3%,2.6% and 3.0% respectively;in 2014 (dry year) leaves removal and tassel & leaves removal increased yield by 6.1% and 8.8%,but tassel removal had no effect on yield.Furthermore,with redundant leaves removal the water consumption was decreased by 34.5-42.5 mm,water use efficiency was increased by 14.3%-17.2% compared with the control.So tassel removal and lower leaves removal should be regarded as a new method to further increase grain yield of high-yielding summer maize.

Key words: High-yielding maize, Leaf removal, Tassel removal, Yield, Photosynthesis

CLC Number:

S513.01

WANG Lei, DU Xiong, CUI Yan-hong, DANG Hong-kai, LI Ke-jiang, HE Zhen-ying, YU Xiu-yan. Effects of Removing Redundant Organs on Yield Formation of High-yielding Summer Maize[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(4): 132-138. doi: 10.7668/hbnxb.2015.04.023.

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