Crops ›› 2023, Vol. 39 ›› Issue (2): 145-150.doi: 10.16035/j.issn.1001-7283.2023.02.021

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Effects of Nitrification Inhibitor on the Nitrogen Concentration and Yield in Summer Maize Plants and Soil under Reduced Nitrogen Application

Zhang Panpan(), Li Chuan, Zhang Meiwei, Zhao Xia, Huang Lu, Liu Jingbao, Qiao Jiangfang()   

  1. Cereal Crops Institute, Henan Academy of Agricultural Sciences, Zhengzhou 450002, Henan, China
  • Received:2021-09-29 Revised:2022-09-26 Online:2023-04-15 Published:2023-04-11

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Abstract:

The experiment was conducted with seven treatments including normal nitrogen (N) rate (T1), N reduced by 10%+nitrification inhibitor, 2-chloro-6-trichloromethylpyridine (T2), N reduced by 10% (T3), N reduced by 20%+nitrification inhibitor (T4), N reduced by 20% (T5), N reduced by 30%+nitrification inhibitor (T6) and N reduced by 30% (T7), to investigate the effects of different treatments on the soil nitrogen concentration, accumulation and distribution of dry matter and nitrogen, and grain yield and its components. The results indicated that, in maturity stage, the highest dry matter accumulations were obtained in the T1 and T4 treatments. T7 treatment had the highest grain proportion by 55.98%. After silking stage, the highest N accumulation was obtained in T2 treatment. The highest grain distributions in the plants were found in T6 and T7 treatments. After fertilizer application, soil NH4+-N concentration was the highest in T4 treatment, NO3--N and Nmin concentrations were the highest in T1 treatment at early stage and the three nitrogen indexes of T4 treatment were higher at later stage. Mean grain yield was 11.46t/ha. The highest yields were obtained in T1 and T4 treatments, the average was 11.87t/ha. Thus, N reduced by 20%+nitrification inhibitor 2-chloro-6- trichloromethylpyridine could decrease the input and increase soil N concentration in the agroecological system and maintain the high-yield and high-efficiency in the maize production.

Key words: Summer maize, Nitrification inhibitor, Nitrogen fertilizer reduction, Nitrogen concentration

Fig.1

Effects of different treatments on the dymamic of dry matter accumulation of maize shoot"

Fig.2

Effects of different treatments on the dry matter accumulation and distribution of maize organs at maturity stage"

Fig.3

Effects of different treatments on the dynamic of nitrogen accumulation of maize shoot"

Fig.4

Effects of different treatments on the nitrogen accumulation and distribution of maize organs at maturity stage"

Fig.5

Effects of different treatments on NH4+-N, NO3--N and Nmin concentration in the soil AN, NN and NM represent the concentrations of NH4+-N, NO3--N and Nmin in the soil, respectively"

Table 1

Effects of different treatments on maize grain yield and its components"

处理
Treatment		 穗行数
Row number
per ear		 行粒数
Kernel number
per row		 千粒重
1000-grain
weight (g)		 产量
Yield
(t/hm2)
T1 16.4a 34.9ab 363.8ab 11.96a
T2 16.4a 35.4ab 372.9a 11.63ab
T3 16.0a 35.7ab 365.6ab 11.37ab
T4 16.3a 36.9a 359.9b 11.77a
T5 16.4a 34.3b 370.4a 11.51ab
T6 16.3a 34.6b 373.8a 11.07b
T7 16.4a 34.7b 372.1a 10.93b
平均值Average 16.3 35.2 368.4 11.46
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