Scientia Agricultura Sinica ›› 2025, Vol. 58 ›› Issue (11): 2225-2238.doi: 10.3864/j.issn.0578-1752.2025.11.011

• HORTICULTURE • Previous Articles     Next Articles

The Influence of Nitrogen Application Under Aerated Drip Irrigation on the Hydraulic Characteristics and Photosynthetic Capacity of Tomato

LI XiaoYan(), DU YaDan(), HU XiaoTao, LU YiNing, GU XiaoBo   

  1. College of Water Resources and Architectural Engineering/Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling 712100, Shaanxi
  • Received:2025-01-24 Accepted:2025-02-22 Online:2025-06-01 Published:2025-06-09
  • Contact: DU YaDan

Abstract:

【Objective】 The objective of this study is to investigate the effect of water and nitrogen coupling on tomato yield and water use efficiency (WUE) under aerated drip irrigation, and to provide a scientific basis for water and nitrogen management for tomato cultivation in Northwest China.【Method】 Two greenhouse experiments were carried out in 2023 and 2024, and three irrigation levels W1 (50% ETC), W2 (75% ETC) and W3 (100% ETC) were set under aerated drip irrigation with micro and nano bubble generating devices (ETC is the actual crop evaptranspiration). Three nitrogen application levels were N1 (0), N2 (150 kg·hm-2) and N3 (250 kg·hm-2), and W3 (100% ETC) N3 (250 kg·hm-2) under traditional drip irrigation was used as control treatment (CK). The effects on soil moisture content, hydraulic characteristics, photosynthetic characteristics and yield of tomato were studied.【Result】 Aerated drip irrigation promoted the uptake and utilization of soil water in tomato, improved plant hydraulic characteristics and leaf photosynthetic characteristics, and increased yield and WUE by 1.21% to 1.84% and 1.84% to 2.25%, respectively. Optimized water and nitrogen management under aerated drip irrigation could further promote tomato growth and yield. Soil moisture content increased with increasing irrigation but decreased with increasing nitrogen application, reaching a maximum in the W3N1 treatment, which was 0.31% to 19.37% higher than other treatments; tomato stem water potential, Pn, Gs, and SPAD all increased with increasing irrigation and nitrogen application, reaching maximum values in the W3N3 and W2N3 treatments, respectively, and increasing by 0.95% to 104.86% compared with other treatments. PLC decreased with the increase of irrigation water and N application and decreased to the minimum value in W3N3 treatment, which was 11.27% to 69.24% lower than other treatments. Nitrogen application under deficit irrigation alleviated water stress in tomato plants, and soil moisture content, stem water potential, PLC, Pn, Gs and SPAD were significantly improved by 17.37% to 21.16% under deficit irrigation W2 compared with W1. Yields of both spring-summer and autumn-winter tomato reached the maximum in the W2N3 treatment, WUE reached the maximum in the W2N3 and W1N3 treatments, respectively, and autumn-winter tomato WUE was increased by 1.02% in the W1N3 treatment compared with W2N3, but yield was significantly decreased by 15.25%. Path analysis revealed that the direct effect coefficient of soil moisture content on yield under aerated drip irrigation was 0.439, while the indirect effect coefficients of soil moisture content on yield through stem water potential, PLC, Pn and Gs were 0.952, 0.852, 0.582 and 0.494, respectively.【Conclusion】 Nitrogen application under aerated drip irrigation can improve the hydraulic characteristics of tomato under different irrigation conditions, enhance the photosynthetic capacity of leaves, and then improve the tomato yield. Considering the yield and WUE, the appropriate irrigation volume and nitrogen application rate for tomato in Northwest China are 75% ETC and 250 kg·hm-2, respectively.

Key words: aerated drip irrigation, nitrogen application, hydraulic characteristics, photosynthetic capacity, tomato, yield

Fig. 1

Average daily solar radiation, photosynthetically active radiation, air temperature and relative humidity during the reproductive period of tomato"

Fig. 2

Spatiotemporal variation of soil moisture content in 0-60 cm soil layer of tomato under different treatments W1、W2和W3分别表示50% ETC、75% ETC和100% ETC灌水水平(ETC为实际作物蒸发蒸腾量),N1、N2和N3分别表示0、150和250 kg·hm-2施氮水平,CK为传统滴灌下W3(100% ETC)N3(250 kg·hm-2)处理W1, W2 and W3 represent 50% ETC, 75% ETC and 100% ETC irrigation levels (ETC is the actual crop evaptranspiration), N1, N2 and N3 represent 0, 150 and 250 kg·hm-2 nitrogen application levels, respectively. CK is treated with W3 (100% ETC) N3 (250 kg·hm-2) under traditional drip irrigation。下同The same as below"

Fig. 3

Changes of stem water potential before dawn, stem water potential at midday and xylem water conductivity loss value (PLC) of tomato fruit in autumn-winter under different treatments"

Fig. 4

Changes of net photosynthetic rate (Pn) and stomatal conductance (Gs) in autumn-winter tomato during fruit expansion period under different treatments"

Fig. 5

Changes of SPAD of leaves in each canopy layer of tomato during fruit expansion period under different treatments"

Table 1

Effects of different treatments on fruit number, single fruit weight, yield and WUE of tomato"

处理
Treatment
果数
Fruit number
单果重
Single fruit weight (g)
产量
Yield (t·hm-2)
水分利用效率
WUE (kg·m-3)
春夏茬Spring-summer tomato
W1N1 14.89±1.76d 93.80±7.96e 66.46±3.01f 35.32±1.60d
W1N2 16.44±1.67bcd 103.98±11.23cde 81.31±2.20de 44.20±1.19b
W1N3 17.00±1.73abc 115.39±13.26bc 93.17±2.14c 51.09±1.18a
W2N1 16.33±1.50bcd 100.61±6.88de 78.48±3.02e 35.31±1.36d
W2N2 17.44±2.66abc 114.64±17.59bc 94.05±2.89c 43.00±1.32bc
W2N3 17.00±1.87abc 137.48±11.65a 111.30±4.15a 52.05±1.94a
W3N1 15.44±1.59cd 111.59±9.47bcd 82.11±2.44d 34.13±1.01d
W3N2 18.67±2.18a 112.89±11.78bcd 100.12±3.91b 41.61±1.63c
W3N3 17.67±1.73ab 121.73±11.36b 102.42±2.11b 42.57±0.88c
CK 18.00±2.24ab 118.76±15.66b 101.19±3.90b 41.80±1.61c
秋冬茬Autumn-winter tomato W1N1 14.22±0.83g 116.63±6.54d 79.42±2.18g 50.27±1.38d
W1N2 15.89±1.36def 122.79±10.27cd 93.10±3.67ef 59.39±2.34b
W1N3 16.11±1.27cde 127.33±10.45bc 97.94±3.04cd 63.25±1.97a
W2N1 15.33±1.19ef 123.37±9.95cd 90.35±2.48f 48.90±1.34d
W2N2 16.33±0.87bcde 127.50±7.58bc 99.82±5.61c 54.52±3.07c
W2N3 17.00±1.22abcd 142.24±11.22a 115.56±4.79a 62.61±2.59a
W3N1 14.89±1.17fg 134.44±10.23ab 95.59±1.93de 48.84±0.99d
W3N2 17.11±0.78abc 126.40±9.81bcd 103.65±6.91b 52.72±3.51c
W3N3 17.56±1.24a 126.24±10.21bcd 105.89±3.81b 54.10±1.95c
CK 17.44±0.88ab 124.51±7.60bcd 103.98±1.79b 52.91±0.91c
显著性分析(F值)Significance analysis (F value)
春夏茬Spring-summer tomato A ns ns ns ns
N 515.76*** 8.18** 24.69*** 642.65***
W 199.29*** ns 9.26*** 74.96***
N×W 15.83*** ns 2.86* 29.35***
秋冬茬Autumn-winter tomato A ns ns ns ns
N 140.41*** 26.96** 4.58* 163.96***
W 77.77*** 7.48** 6.34** 47.96***
N×W 11.03*** ns 5.15** 12.92***

Fig. 6

Correlation analysis of various indicators of tomato under aerated drip irrigation SWC, WPT, PLC, Pn, Gs, U.SPAD, M.SPAD, L.SPAD, FN and WSF represent soil moisture content, stem water potential, xylem water conductivity loss value, net photosynthetic rate, stomatal conductivity, SPAD of upper canopy leaf, SPAD of middle canopy leaf, SPAD of lower canopy leaf, fruit number and single fruit weight, respectively"

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