Light-response Curves and Yield of Maize in Grain-filling Period

doi:10.7668/hbnxb.201751096

Abstract

Abstract: In this study, the spring maize variety Guangde 5 was taken as the test material to analyze the effects of different planting densities on the diurnal variation of photosynthetic performance and yield of spring maize, and clarify the mechanism of grain dry matter accumulation, transport and grain yield formation in grain filling period, in order to provide the theoretical basis and practical guidance for selecting the suitable planting density of spring maize. The results showed that, with the increased of density, the daily variations of net photosynthetic rate, stomatal conductivity and transpiration rate all presented the unimodal curve change trends though their times to reach to the peak values were different, while the carbon dioxide concentration between the cells showed a change trend of "V" type curve. The curve fitting of photosynthetic response in different planting densities was good, reaching to a 0.05 significant level. M50 treatment had the maximum net photosynthetic rate, increasing by 24.28%, 15.41%, 18.41% and 3.13%, respectively, compared with M40, M45, M55 and M60 treatments. The grain yield of M50 was also the highest, which was 21.60%, 1.24%, 0.84% and 4.10% higher than M40, M45, M55 and M60, respectively. Considering the net photosynthetic rate, stomatal conductance, simulated maximum net photosynthetic rate and grain yield of each density comprehensively, the suitable planting density for Guangde 5 was 75 000 plants/ha.

Key words: Spring maize, Density, Diurnal variation of photosynthesis, Light-response curve, Yield

CLC Number:

S513

ZHANG Xiangqian, BAI Lanfang, LU Zhanyuan, GUO Xiaoxia, SUN Fengcheng, CHENG Yuchen, JIA Kai, WANG Yufen. Light-response Curves and Yield of Maize in Grain-filling Period[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(4): 96-103. doi: 10.7668/hbnxb.201751096.

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