Crops ›› 2022, Vol. 38 ›› Issue (2): 222-229.doi: 10.16035/j.issn.1001-7283.2022.02.031

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Effects of Dry-Wet Alternate Irrigation and Nitrification Inhibitor on Rice Yield and Soil Properties

Han Lijun1,2(), Xue Zhangyi1,2, Xie Hao1,2, Gu Junfei1,2,*()   

  1. 1Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu, China
    2Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Yangzhou University, Yangzhou 225009, Jiangsu, China
  • Received:2021-10-20 Revised:2021-12-16 Online:2022-04-15 Published:2022-04-24
  • Contact: Gu Junfei E-mail:1321223850@qq.com;gujf@yzu.edu.cn

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Abstract:

The impacts of dry-wet alternate irrigation and nitrification inhibitors on rice yield and soil properties were investigated for providing theoretical foundation and technical reference for efficient rice cultivation. The dry-wet alternate irrigation method was adopted, with “Jinxiangyu 1” and “Yangdao 6” as the test materials, and four treatments were set up, urea (CK), urea+DCD, urea+DMPP, and urea+DCD+DMPP, the nitrification inhibitors were DCD and DMPP. The results indicate that under the same irrigation method, compared with CK treatment, the inclusion of nitrification inhibitor had a higher yield owing to its higher number of grains per panicle and seed setting rate. Compared with CK treatment, the inclusion of DCD, DMPP and the combined use of DCD and DMPP increased the activity of soil urease and invertase, while decreased the activity of soil nitrate reductase during the growth period of rice. In addition, various nitrification inhibitors the treatments significantly increased soil ammonium nitrogen (NH4+-N) during the growing season of rice and reduced nitrate nitrogen (NO3--N) levels and on this basis increased soil available nitrogen levels. Among them, the inhibitory effect of DMPP was better than that of DCD, and the combined effect of the two inhibitors at the same time was better than that of their single use. In general, the nitrification inhibitor treatment had higher soil nutrients during the key growth period of rice under the condition of dry-wet alternate irrigation, which could further increase rice yield.

Key words: Rice, Nitrification inhibitor, Soil properties, Yield

Table 1

Effects of nitrification inhibitors on rice yield and its constituent factors"

品种
Variety		 处理
Treatment		 每盆穗数
Number of panicles per pot		 穗粒数
Spikelets per panicle		 结实率
Filled grains rate (%)		 千粒重
1000-grain weight (g)		 产量（g/盆）
Yield (g/pot)
YD 6 CK 20.0b 157.9c 86.3b 28.6a 77.9c
DCD 20.7ab 160.4b 87.1a 28.3b 81.8b
DMPP 21.0a 161.4b 87.6a 28.3b 84.1b
DCD+DMPP 21.3a 161.7a 87.8a 28.4b 86.1a
JXY 1 CK 22.0b 143.7c 84.5b 26.3a 70.3c
DCD 22.5b 147.7b 85.4a 25.8b 72.9b
DMPP 23.3a 149.0b 85.5a 25.7b 75.8b
DCD+DMPP 23.6a 152.6a 85.6a 25.6b 77.7a

Table 2

The effects of nitrification inhibitors on the dry matter weight and crop growth rate of rice varieties at each growth stage"

品种
Variety		 处理
Treatment		 干物质重（g/盆）
Dry matter weight (g/pot)		 生长速率[g/(盆?d)]
Growth rate [g/(pot?d)]
分蘖中期
Mid-tillering (MT)		 拔节期
Jointing (J)		 抽穗期
Heading (H)		 成熟期
Maturity (M)		 分蘖期―拔节期
(T-J)		 拔节期―抽穗期
(J-H)		 抽穗期―成熟期
(H-M)
YD 6 CK 17.6c 50.6c 91.2c 155.6c 1.57c 2.14c 1.22c
DCD 18.7b 63.2b 105.4b 172.1b 2.11b 2.24b 1.30b
DMPP 19.1a 65.2b 108.5a 176.8a 2.19b 2.27b 1.34ab
DCD+DMPP 19.5a 68.1a 110.2a 179.9a 2.31a 2.81a 1.36a
JXY 1 CK 16.4c 47.1c 85.5c 140.5d 1.46c 2.02c 1.07c
DCD 17.5b 59.5b 100.6b 160.7c 2.01b 2.16b 1.17b
DMPP 17.8b 61.8b 104.1b 166.8b 2.10b 2.22a 1.22a
DCD+DMPP 18.0a 64.3a 107.9a 172.9a 2.20a 2.29a 1.27a

Fig.1

The effects of nitrification inhibitors on the SPAD values of leaves of different rice varieties at each growth stage"

Fig.2

The effects of nitrification inhibitors on the soil pH of different rice varieties at each growth stage"

Fig.3

The effects of nitrification inhibitors on the total nitrogen contents of the soil at each growth stage of different rice varieties Different lowercase letters indicate significant difference at the 0.05 level, the same below"

Fig.4

The effects of nitrification inhibitors on the soil NO3--N contents of different rice varieties at each growth stage"

Fig.5

The effects of nitrification inhibitors on the soil NH4+-N contents of different rice varieties at each growth stage"

Fig.6

The effects of nitrification inhibitors on the soil available nitrogen content of different rice varieties at each growth stage"

Fig.7

Effects of nitrification inhibitors on the activities of soil urease, invertase and nitrate reductase in different rice varieties at various growth stages"

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