Crops ›› 2022, Vol. 38 ›› Issue (2): 96-103.doi: 10.16035/j.issn.1001-7283.2022.02.014

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Effects of Ethylene-Chlormequat-Potassium on Nitrogen Metabolism and Yield of Summer Maize under Different Nitrogen Levels

Fang Mengying(), Yan Peng, Lu Lin, Wang Qingyan, Dong Zhiqiang()   

  1. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Eco-Physiology and Cultivation, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
  • Received:2021-08-04 Revised:2021-10-13 Online:2022-04-15 Published:2022-04-24
  • Contact: Dong Zhiqiang E-mail:82101182163@caas.cn;dongzhiqiang@caas.cn

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Abstract:

Applying chemical regulation technology to improve the nitrogen metabolism process of maize to achieve “reducing nitrogen and increasing efficiency” is an important way to ensure green and sustainable production of maize. In this experiment, the single cross maize Yudan 9953 was used as the research material, Ethylene-Chlormequat-Potassium (ECK) and nitrogen gradient treatments (0, 96, 132, 168, 204 and 240kg/ha) were set up in Yanjiao, Hebei province, and Shunyi, Beijing, in 2019 and 2020, respectively, to study the effects of ECK on nitrogen metabolism and yield of summer maize under different nitrogen application rates, water was as a control (CK). The results showed that ECK treatment increased nitrate reductase activity and soluble protein content in summer maize leaves at flowering stage, the activities of glutamic-pyrupropyl transaminase and glutamic-oxalacetic transaminase activities, and glutamine synthetase activities in the middle and late stages of grain filling at nitrogen application rates of 204 and 240kg/ha. Compared with CK, under 204kg/ha nitrogen application rate, ECK treatment significantly increased the nitrogen accumulation in plant, grain and total nitrogen by 8.9%, 8.3% and 8.6%, respectively. Compared with CK, under the condition of 204kg/ha nitrogen application rate, ECK treatment significantly increased summer maize yield by 7.5%. The treatment of ECK could effectively improve the nitrogen metabolism of maize, promote the absorption, assimilation and accumulation of nitrogen, and increase the yield, so as to realize “reducing nitrogen and increasing efficiency”.

Key words: Ethylene-chlormequat-potassium, Nitrogen fertilizer, Maize, Nitrogen metabolism, Yield

Fig.1

Daily rainfall and daily mean temperature during the summer maize growing season in 2019 and 2020"

Fig.2

Effects of ECK on NR activities of functional leaves in summer maize under different nitrogen application rates “*”and“**”indicate significant differences between ECK and control treatments at 0.05 and 0.01 levels at the same growth period, respectively, the same below"

Fig.3

Effects of ECK on GS activities of functional leaves in summer maize under different nitrogen application rates"

Fig.4

Effects of ECK on GPT activities of functional leaves in summer maize under different nitrogen application rates"

Fig.5

Effects of ECK on GOT activities of functional leaves in summer maize under different nitrogen application rates"

Fig.6

Effects of ECK on soluble protein contents of functional leaves in summer maize under different nitrogen application rates"

Table 1

Effects of ECK on summer maize N accumulation under different nitrogen application rates kg/hm2"

处理
Treatment		 植株氮素积累量
N accumulation
of plant		 籽粒氮素积累量
N accumulation
of grain		 总氮素积累量
Total N
accumulation
N0 CK 91.0fgh 128.0f 218.9d
ECK 89.6gh 124.2f 213.8d
N96 CK 98.8defg 145.5e 244.3c
ECK 115.9ab 149.8de 265.7b
N132 CK 86.3h 159.9bc 246.2c
ECK 121.7a 169.2a 290.9a
N168 CK 95.8efgh 152.6cde 248.4c
ECK 99.7cdef 147.8e 247.5c
N204 CK 100.3cdef 146.1e 246.4c
ECK 109.2bc 158.3bc 267.5b
N240 CK 108.5bcd 162.3ab 270.8b
ECK 105.0cde 155.9bcd 260.9b

Fig.7

Effects of ECK on summer maize yield under different nitrogen application rates Different lowercase letters indicate significant difference at 5% level"

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