Effect of Chemical Regulation and Density on Spring Maize Leaf Senescence and Yield in Northeast China

doi:10.7668/hbnxb.2015.04.021

Abstract

Abstract: The objective of this experiment was to investigate the effect of chemical regulation measures on leaf senescence and yield of spring maize under different plant densities,and to provide theoretical and experimental evidence for the effect of increase production of chemical regulation cultivation on spring maize in Northeast China.Dongnong 253 was used as material in this experiment and was planted under the densities of 50 000,60 000,70 000,80 000 plants/ha,and sprayed the chemical regulator of Yuhuangjin with DA-6 and Ethephon as the main material at foliar during the jointing stage.The results showed that the highest maize yield could reached 13 290.95 kg/ha and appeared at the density of 70 000 plants/ha after the treatment of Yuhuangjin.Rational close planting was the safeguards to obtain high yield and the chemical regulator can play a role of increasing yield with the increase of density as the premise.With the increase of planting density,under the treatment of water,the plant height was increased,dry weight of single plant was decreased;while using Yuhuangjin could lowered the plant height,increased the weight of single plant and declined,which could creat the conditions for obtaining high yield.With the planting density increasing,the decline of the leaf SPAD values and the degree of the leaf aging was increased in the maize treated with water.While under the treatment of Yuhuangjin,the photosynthetic characteristics was increased and the aging was delayed.During leaf senescence,under the treatment of water and with the increase of planting density,the activity of antioxidase (SOD,POD,CAT) were declined,the content of MDA was decreased and the content of soluble sugar was increased.Yuhuangjin increased the activity of antioxidant enzyme (SOD,POD,CAT) and the content of soluble sugar and decreased the content of MDA.The result of the correlation analysis and path analysis on effect of the factors to leaf senescence at the density of 70 000 plants/ha showed that,under the treatment of water,MDA >soluble sugar >CAT >SOD >POD;under the treatment of Yuhuangjin,MDA >soluble sugar >SOD >POD >CAT. Under the condition of high density,plant growth regulator Yuhuangjin has important application value in enhancing leaf anti-aging ability during later growth stage and improving maize yield.

Key words: Chemical regulator, Density, Spring maize, Senescence, Yield

CLC Number:

S513.01

YANG Zhen-fang, MENG Yao, GU Wan-rong, WANG Yong-chao, LI Li-jie, ZHANG He, ZENG Fan-xing, WEI Shi. Effect of Chemical Regulation and Density on Spring Maize Leaf Senescence and Yield in Northeast China[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(4): 117-125. doi: 10.7668/hbnxb.2015.04.021.

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