不同种植方式下高密度玉米群体光能利用因子比较

doi:10.12190/j.issn.2096-1197.2020.03.11

Abstract

Abstract: 【Objective】To find out the mechanism of increasing yield for the density-tolerant maize varieties under high density （97 500 plants/hm²）.【Methods】Comparing the light energy utilization factors and yield components,such as light transmittance,leaf area index（LAI）,relative chlorophyll content （SPAD）,photosynthetic rate （PN）under Denhai 618 and K3564 varieties with double-plant and single-plant in one hole plant model by using split zone design.【Results】The results showed that the panicle position layer and bottom light transmittance of the two cultivars were higher than that of the single plant in the middle growth stage under one-hole and double-plant planting.The leaf area index （LAI） of all treatments increased first and then decreased,and all reached the maximum value at the 20th day after silking.The leaf area index increased rapidly at the early stage and decreased rapidly at the later stage.The two plants showed the trend of moderate stability （long green leaf duration and slow decay at later stage）.In the same growth period,the chlorophyll SPAD of double plant was significantly higher than that of single plant,and that of Denghai 618 was higher than that of K3564.The net photosynthetic rate of each treatment reached the maximum at heading stage,and that of Denghai 618 was higher than that of K3564 at each stage,and that of one hole and two plants was higher than that of one single plant at heading stage.At heading stage,Denghai 618,K3564 one-hole double-plant planting was 6.8% higher than that of one-hole single plant,respectively,and that of Denghai 618 and K3564 was higher than that of one-hole single plant 4.8%,indicating that the planting mode had a great effect on the net photosynthetic rate of the panicle leaf.【Conclusion】Since the number of grains per ear and the weight of 100 grains were obviously better,and the yield of two varieties was significantly higher under two-plant in one hole than that single-plant in one hole.

Key words: Maize, Planting patterns, High density, Light energy utilization factors

CLC Number:

S513

ZHAO Na, DANG Jiuzhan, HAO Yunfeng, ZHANG Yujin, LI Xiaohong, MA Jun, GU Min, SONG Jianjun. Comparison of light energy utilization factors of high-density maize population under different planting methods[J].Journal of Northern Agriculture, 2020, 48(3): 74-79.

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Comparison of light energy utilization factors of high-density maize population under different planting methods

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