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| DOI：10.13522/j.cnki.ggps.2022596 |
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| Effect of Irrigation Amount on the Diurnal Changes of Photosynthesis and Dry Matter Accumulation of Maize in the Horn Mouth Stage |
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MENG Tiantian, DU Xiangyu, ZHANG Xiangqian, CHEN Lirong,
LU Zhanyuan, LAN Huiqing, LIU Yajie, WU Di
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1. Agricultural University of Hebei, Baoding 071000, China; 2. Mengcao Ecological Environment (Group) Co., Ltd.,
Hohhot 010070, China; 3. Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot 010031, China;
4. Key Laboratory of Ecological Restoration and Pollution Prevention of Degraded Farmland of
Inner Mongolia Autonomous Region, Hohhot 010031, China; 5. Inner Mongolia University, Hohhot 010020, China
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| Abstract: |
| 【Objective】To reveal the diurnal change rule of photosynthesis of spring maize under different irrigation amount at the big bell mouth stage, further clarify the difference of dry matter accumulation of maize. 【Method】Taking the spring maize variety Guangde 5 as the experimental material, the experiment began in 2018, and set five irrigation amount in 2019, namely DGT1 (315 m3/hm2), DGT2 (645 m3/hm2), DGT3 (945 m3/hm2), DGT4 (1 275 m3/hm2), DGT5 (1 605 m3/hm2), and added no irrigation rain fed control (DGT0) in 2020, The effects of irrigation amount on the diurnal changes of photosynthetic characteristics, light response curves and dry matter accumulation of the largest unfolding leaves of spring maize at the bell mouth stage were analyzed.【Result】The results showed that with the increase of irrigation amount, the diurnal changes of photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) in each treatment showed a bimodal curve trend, and there was a midday rest phenomenon. The time to reach the bimodal was the same, and the peak values were different; However, the diurnal variation of intercellular CO2 concentration (Ci) of each treatment showed a "V" shaped curve that decreased first and then increased. The light response curves of different irrigation amount were well fitted. The maximum net photosynthetic rate of DGT3 treatment was the largest in 2020 and 2019. The maximum net photosynthetic rate of DGT3 treatment in 2019 was 8.71%, 3.68%, 13.75% and 13.59% higher than that of DGT1, DGT2, DGT4 and DGT5 treatment respectively. In 2020, the maximum net photosynthetic rate of DGT3 treatment was 25.6%, 22.0%, 8.2%, 17.0% and 22.2% higher than that of DGT0, DGT1, DGT2, DGT4 and DGT5 treatment respectively. In 2019, the dry matter of single plant in DGT3 was 14.1%, 17.8%, 28.9% and 12.1% higher than that in DGT1, DGT2, DGT4 and DGT5 respectively. In 2019 and 2020, there were significant differences between DGT3 treatment and DGT1 treatment (P<0.05).【Conclusion】It was concluded that the appropriate irrigation amount spring maize was 945 m3/hm2. |
| Key words: spring maize; irrigation amount; diurnal variation in photosynthesis; light response curve; dry matter |
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