返青后补灌与氮肥用量对旱地小麦产量及水氮利用效率的影响

doi:10.3864/j.issn.0578-1752.2023.17.012

Abstract

Abstract:

【Objective】 The project of high standard farmland construction in China has improved the irrigation conditions in dryland, however, there is usually only once limited irrigation that could be carried out in wheat growing season. In this study, the effects of supplemental irrigation after regreening and nitrogen (N) fertilizer rates on productivity, water and N utilization in dryland wheat and nitrate residue in soil were investigated, so as to provide the theoretical basis and technical support for high-yield, high-efficiency and environment-friendly production in dryland wheat. 【Method】 The two-factor split-plot field experiment was conducted in the typical dryland of the intersection between Loess Plateau and Huang-Huai-Hai Plain from 2019 to 2022, where the irrigation conditions of no-irrigation during whole growth period (I0) and supplemental irrigation after regreening (I1, supplemental irrigation to 85% of field capacity when the soil water content in the 0-40 cm soil layer after wheat regreening was lower than 60% of field capacity at the first time) were assigned to the main plots, and the nitrogen application rates of 0 (N0), 120 kg N·hm^-2(N120), 180 kg N·hm^-2(N180) and 240 kg N·hm^-2(N240) were assigned to the subplots. The grain yield and yield components, water use efficiency, N absorption and utilization in wheat were tested, as well as the nitrate residue in the 0-200 cm soil layer in dryland. 【Result】 Compared with I0, I1 could optimize wheat yield components and increase N absorption capacity, for the 3-year average grain yield and water use efficiency significantly increased by 55.8% and 34.7%, respectively, however, it decreased soil nitrate residue by 11.6% in the 0-200 cm soil layer. With the increase of N application rate, the grain yield, spike number, kernels per spike and water use efficiency initially increased and then decreased, and reached the maximum under the N180 treatment with I0 level, but there were initially increased and then remained stable, and reached the higher level both in the N180 and N240 treatments under I1 level. With the increase of N application rate, the N use efficiency, N uptake efficiency and N partial factor productivity were significantly decreased under the both two irrigation conditions, but the N agronomy efficiency and N apparent efficiency under N180 treatment was not significantly decreased compared with N120 treatment (except I1 level in 2021-2022). Regardless of irrigation, with the increase of N application rate, the soil nitrate residue at harvest were significantly increased. Soil nitrate accumulated largely in the 0-60 cm soil layer under each N application rates with I0 level, and the obvious accumulated effects of soil nitrate residue in the 0-200 cm soil layer were found under N180 and N240 treatments; meanwhile, the soil nitrate residue under I1 level in the 0-60 cm soil layer was significantly lower than that under I0, and there were only accumulated effects of soil nitrate residue was found in the 0-200 cm soil layer under N240 treatment. In general, both the I1N180 and I1N240 could obtain the higher grain yield and water use efficiency. I1N180 treatment reduced water consumption during growth period and soil nitrate residue in the 0-200 cm soil layer, and improved the N efficiency, compared with I1N240 treatment. 【Conclusion】 Supplemental irrigation after regreening combined with 180 kg N·hm^-2N fertilizer could optimize the yield components, shoot N accumulation and N accumulative rate, thus it could not only improve the grain yield and N absorption and utilization efficiency in wheat, but also reduce the soil nitrate residue in 0-200 cm soil layer. Therefore, I1N180 treatment was an optimal model for realizing the collaborative target of high-yield, high-efficiency and environment-friendly in dryland wheat production system.

Key words: supplemental irrigation after regreening, N fertilizer application rate, dryland, wheat, yield, water use efficiency, nitrate residue

ZHAO KaiNan, WU JinZhi, HUANG Ming, LI YouJun, WANG HongTao, HUANG XiuLi, WU ShanWei, ZHANG Jun, ZHAO ZhiMing, ZHAO WenXin, LI ShuJing, LI Shuang, LI WenNa. Effects of Supplemental Irrigation After Regreening and Nitrogen Fertilizer Application Rates on Wheat Yield, Water and Nitrogen Use Efficiency in Dryland[J].Scientia Agricultura Sinica, 2023, 56(17): 3383-3398.

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Figures/Tables 9

Fig. 1

Fig. 2

Table 1

Table 2

Table 3

Fig. 3

Fig. 4

Table 4

Effects of different treatments on N uptake and use efficiency in wheat"

年度 Year	处理 Treatment	氮素利用效率 N use efficiency (kg·kg^-1)	氮肥吸收效率 N uptake efficiency (kg·kg^-1)	氮肥农学效率 N agronomy efficiency (kg·kg^-1)	氮肥偏生产力 N partial factor productivity (kg·kg^-1)	氮肥表观利用率 N apparent efficiency (%)
2019‒2020	I0N0	28.8±0.7d	—	—	—	—
	I0N120	28.1±0.4d	1.10±0.01c	4.46±0.35abc	30.8±0.7c	18.0±1.1c
	I0N180	27.5±0.4de	0.85±0.01e	5.92±0.66a	23.5±0.4d	24.3±0.8b
	I0N240	26.2±0.6e	0.63±0.01f	3.29±0.30c	16.5±0.2e	17.1±1.6c
	I1N0	37.0±0.5a	—	—	—	—
	I1N120	35.5±0.3b	1.52±0.02a	4.02±0.58bc	54.1±0.7a	17.0±2.8c
	I1N180	31.4±0.4c	1.22±0.02b	5.01±0.48ab	38.4±0.5b	31.9±0.7a
	I1N240	31.2±0.1c	0.93±0.01d	4.14±0.25bc	29.2±0.2c	25.8±1.7b
2020‒2021	I0N0	37.6±1.0b	—	—	—	—
	I0N120	33.8±0.9c	1.09±0.02c	8.01±0.12ab	36.9±0.5c	32.4±4.5b
	I0N180	31.4±1.2d	0.86±0.02e	7.58±0.31ab	26.8±0.4e	34.4±2.5b
	I0N240	30.3±1.0d	0.63±0.01f	4.56±0.27c	19.0±0.2f	24.3±1.9c
	I1N0	47.4±0.2a	—	—	—	—
	I1N120	37.6±0.3b	1.67±0.02a	8.02±0.48ab	62.9±0.4a	51.7±1.5a
	I1N180	35.5±0.4bc	1.27±0.01b	8.36±0.91a	44.9±0.3b	49.4±1.7a
	I1N240	33.6±0.5c	1.03±0.01d	7.00±0.58b	34.4±0.2d	44.7±1.1a
2021‒2022	I0N0	48.3±1.6a	—	—	—	—
	I0N120	37.1±0.7bc	1.18±0.02c	3.98±1.96d	43.6±1.1b	35.5±3.2cd
	I0N180	36.1±0.3bcd	0.95±0.01e	7.85±0.81c	34.3±0.3d	40.1±1.3c
	I0N240	34.1±0.2cde	0.72±0.01f	4.83±0.38d	24.7±0.2f	31.2±1.4d
	I1N0	49.6±2.2a	—	—	—	—
	I1N120	37.9±0.4b	1.59±0.01a	14.65±1.42a	60.3±0.5a	66.7±2.2a
	I1N180	33.2±0.3de	1.26±0.02b	11.42±0.70b	41.9±0.4c	64.5±3.0a
	I1N240	31.6±0.3e	1.01±0.01d	9.06±0.29bc	31.9±0.3e	54.9±1.2b
变异来源 Source of variance (F-value)	年度 Year (Y)	198.8**	40.9**	49.2**	391.7**	231.8**
	灌溉 Irrigation (I)	116.8**	3337.4**	45.6**	4970.2**	265.8**
	氮肥N rate (N)	197.8**	2099.2**	14.7**	3316.0**	19.6**
	灌溉×氮肥 I×N	11.3**	42.4**	3.6*	197.4**	0.29

Table 4

Fig. 5

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生长季 Growth season	补灌前土壤含水量 Soil water content before supplemental irrigation (%)	目标土壤含水量 Target soil water content (%)	灌水量 Irrigation amount (mm)
2019-2020	15.8	23.3	40.4
2020-2021	14.7	23.3	46.3
2021-2022	15.6	23.3	41.4

年度 Year	处理 Treatment	穗数 Spike number (×10⁴·hm^-2)	穗粒数 Kernels per spike	千粒重 1000-grain weight (g)	产量 Yield (kg·hm^-2)
2019‒2020	I0N0	371.1±9.3f	20.7±1.2d	42.6±1.5a	3159±72g
	I0N120	421.8±13.0e	22.6±1.4cd	42.4±2.6ab	3694±142f
	I0N180	441.8±3.8d	24.2±1.0c	41.1±0.8ab	4224±134d
	I0N240	443.8±5.1d	23.0±1.6cd	40.0±1.2bc	3949±65e
	I1N0	480.2±5.6c	22.5±0.3cd	38.5±0.8cd	6006±77c
	I1N120	537.3±7.0b	28.9±1.4b	36.9±2.5de	6488±152b
	I1N180	573.8±7.2a	29.5±1.7ab	36.4±0.7de	6907±161a
	I1N240	575.7±13.1a	31.3±2.1a	35.3±1.4e	6999±108a
2020‒2021	I0N0	344.2±24.3e	23.9±0.8f	50.0±0.6a	3468±86f
	I0N120	372.5±40.5de	27.9±0.9e	49.1±0.7ab	4430±111e
	I0N180	389.2±5.3d	31.2±1.1d	49.0±0.6ab	4833±141d
	I0N240	373.5±11.6de	30.7±0.1d	48.3±0.6b	4561±95e
	I1N0	461.2±7.9c	35.9±1.0c	46.9±1.1c	6581±178c
	I1N120	526.6±19.4b	38.1±0.1b	44.1±0.2d	7543±88b
	I1N180	576.6±14.5a	41.2±1.4a	40.8±1.3e	8087±108a
	I1N240	590.3±10.0a	41.6±1.0a	40.1±0.3e	8262±96a
2021‒2022	I0N0	386.9±42.6d	32.2±2.9e	44.0±2.5ab	4759±202e
	I0N120	477.7±46.0bc	33.8±1.0de	40.0±1.3c	5237±238d
	I0N180	491.1±55.1bc	41.7±1.2c	42.1±1.2bc	6172±100c
	I0N240	478.6±10.4bc	40.3±0.7c	41.7±2.8bc	5919±75c
	I1N0	446.1±33.0cd	35.2±2.2d	45.6±1.1a	5478±194d
	I1N120	536.1±39.0ab	46.6±0.9b	40.6±1.6c	7236±104b
	I1N180	583.6±13.8a	51.0±1.6a	41.0±0.4c	7533±140a
	I1N240	574.5±25.3a	52.6±1.4a	41.7±1.1bc	7653±102a
变异来源 Source of variance (F-value)	年度 Year (Y)	19.2**	932.7**	863.7**	431.7**
	灌溉 Irrigation (I)	468.5**	730.2**	702.0**	6722.6**
	氮肥N rate (N)	59.8**	150.6**	145.2**	426.1**
	灌溉×氮肥 I×N	4.7**	10.9**	11.3**	17.7**

处理 Treatment	耗水量 ET (mm)			水分利用效率 WUE (kg·hm^-2·mm^-1)
处理 Treatment	2019‒2020	2020‒2021	2021‒2022	2019‒2020	2020‒2021	2021‒2022
I0N0	337.5±7.9e	311.1±7.7c	313.6±13.2d	9.4±0.3f	11.2±0.4e	15.2±0.4d
I0N120	333.1±9.4e	319.5±5.4c	332.8±7.6cd	11.1±0.5d	13.9±0.4d	15.7±0.3cd
I0N180	362.3±5.2d	323.2±3.7c	336.7±6.1bc	11.7±0.3d	15.0±0.2d	18.3±0.2b
I0N240	385.0±14.0c	319.6±3.1c	359.3±4.3b	10.3±0.4e	14.3±0.2d	16.5±0.3c
I1N0	405.7±4.7b	357.9±6.4b	351.2±8.9bc	14.8±0.2c	18.4±0.6c	15.6±0.5cd
I1N120	406.1±6.4b	373.2±12.3ab	388.4±6.1a	16.0±0.4b	20.3±0.7b	18.6±0.2ab
I1N180	403.3±3.7b	380.2±9.4a	385.7±6.4a	17.1±0.1a	21.3±0.4ab	19.5±0.5a
I1N240	425.2±7.1a	382.0±4.8a	401.8±10.8a	16.5±0.4ab	21.6±0.4a	19.1±0.5ab
均值 Average	382.3±7.1A	345.8±6.3C	358.7±6.5B	13.4±0.6B	16.9±0.8A	17.3±0.4A
F值 F Value
年度 Year (Y)	47.0**			288.8**
灌溉 Irrigation (I)	281.6**			982.9**
氮肥N rate (N)	19.1**			75.8**
灌溉×氮肥I×N	0.86			2.9*

Effects of Supplemental Irrigation After Regreening and Nitrogen Fertilizer Application Rates on Wheat Yield, Water and Nitrogen Use Efficiency in Dryland

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