Comparison of Shuttleworth–Wallace and Dual Crop Coefficient Method for Estimating Evapotranspiration of a Tea Field in Southeast China

Yan, Huimin; Huang, Song; Zhang, Jianyun; Zhang, Chuan; Wang, Guoqing; Li, Lanlan; Zhao, Shuang; Li, Mi; Zhao, Bin

doi:10.3390/agriculture12091392

Cited by 8 publications

(1 citation statement)

References 55 publications

(114 reference statements)

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“…This model further considers the effect of inadequate soil water on crop ET c using a water stress coefficient (K s ) [20,21]. The dual K c method has been successfully used for various crops grown in greenhouses or open fields [17,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Estimating Evapotranspiration of Greenhouse Tomato under Different Irrigation Levels Using a Modified Dual Crop Coefficient Model in Northeast China

Yao,

Gao,

Wang

et al. 2023

Agriculture

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Accurate quantification of evapotranspiration (ETc) and its components are critical for enhancing water use efficiency and implementing precision irrigation. A two-year experiment was conducted for greenhouse-grown tomatoes under mulched drip irrigation with three irrigation treatments during 2020–2021 in Northeast China. Three different irrigation treatments were applied by setting upper and lower soil moisture irrigation thresholds (i.e., W1, 65%θFC–75%θFC, W2, 75%θFC–85%θFC, W3, 85%θFC–95%θFC, respectively, where θFC is field capacity). In this study, a modified dual crop coefficient (Kc) model was proposed to simulate daily ETc, plant transpiration (Tr) and soil evaporation (Es). The simulations of the model were validated against observed data from the sap flow system combined with the soil water balance method. The controlling factors on the variations of evapotranspiration and its components were also identified by using the path analysis method. Results showed that the modified dual Kc model can accurately simulate daily ETc, Es, and Tr for the greenhouse tomato under different irrigation conditions, with the coefficients of determination ranging from 0.88 to 0.98 and the index of agreement higher than 0.90. The seasonal cumulative ETc of tomato for W1–W3 were 138.5–194.4 mm, of which 9.5–15.8% was consumed by Es. Path analysis showed that the net radiation (Rn) was the dominant factor controlling the variations of Tr and ETc during the growing seasons. The canopy coverage degree (Kcc) was the dominant controlling factor of Es, while the temperature (Ta) was the primary limiting factor affecting Es. This study can provide reference information for developing proper irrigation management in a greenhouse-grown tomato in the north cold climate regions.

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Section: Introductionmentioning

confidence: 99%

Estimating Evapotranspiration of Greenhouse Tomato under Different Irrigation Levels Using a Modified Dual Crop Coefficient Model in Northeast China

Yao,

Gao,

Wang

et al. 2023

Agriculture

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Reasons of sprinkler freezing and rotational irrigation for frost protection in tea plantations

Pan,

2024

Irrigation and Drainage

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Sprinkler irrigation can effectively reduce the rate of frostbite on cash crop buds and young fruits. In this study, we propose applying the rotational irrigation method in frost protection to achieve water conservation, simplify the sprinkler system and expand the frost protection area. The freezing test of various sprinklers in a frosty environment (approximately −4.0°C) was conducted to determine the maximum duration of sprinkling cessation for the microsprinkler, butterfly‐shaped sprinkler, impact sprinkler and MegaNet sprinkler. The results indicate that the butterfly‐shaped sprinkler and impact sprinkler freeze after 4 and 3 min, respectively. In contrast, the microsprinkler and MegaNet sprinkler do not freeze even after 10.0 min. The temperature increase amplitude and rate of the microsprinkler are significantly greater. At an ambient temperature of −4.0°C, three areas were irrigated with microsprinklers. Each sprinkler had a rotation interval of 3.0 min of spraying followed by 6.0 min of stopping. This ensured that the canopy temperature was maintained at approximately −1.0°C. The water consumption was only one‐third of that used in continuous sprinkler irrigation. This sprinkler irrigation method for frost protection is more water efficient than traditional continuous sprinkler irrigation and easier to operate and maintain than existing automatic sprinkler irrigation methods.

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Single and basal crop coefficients for estimation of water use of tree and vine woody crops with consideration of fraction of ground cover, height, and training system for Mediterranean and warm temperate fruit and leaf crops

Pereira,

Paredes,

Oliveira

et al. 2023

Irrig Sci

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This paper reviews the research on the FAO56 single and basal crop coefficients of fruit trees and vines performed over the past twenty-five years and focus on Mediterranean and warm temperate trees and vines. Two companion papers (López-Urrea et al., (2023) Single and basal crop coefficients for estimation of water use of tree and vine woody crops with consideration of fraction of ground cover, height, and training system for temperate climate fruit crops. Irrig Sci (submitted); Paredes et al. (2023) Single and basal crop coefficients for estimation of water use of tree and vine woody crops with consideration of fraction of ground cover, height, and training system for tropical and subtropical fruit crops. Irrig Sci (submitted)) are dedicated, respectively, to Temperate and to Tropical and Subtropical trees and vines. The main objective of the paper is to update available information on single (Kc) and basal (Kcb) standard crop coefficients, and to provide for updating and completing the FAO56 tabulated Kc and Kcb. The Kc is the ratio between non-stressed crop evapotranspiration (ETc) and the grass reference evapotranspiration (ETo), while Kcb is the ratio between crop transpiration (Tc) and ETo. The selection and analysis of the literature were performed considering only studies that adhere to the FAO56 method, thus computing ETo with the FAO Penman–Monteith ETo equation, the ASCE grass ETo, or another equation that could be properly related with the former, and ETc, or Tc, was obtained using properly accurate field measurements on crops under pristine or eustress conditions. The crops considered refer to Mediterranean (grapes and olive) and warm temperate areas (avocado, citrus, persimmon, loquat, and tea) fruit and leaf crops. Papers satisfying the above conditions were selected to provide for standard Kc and Kcb data. Preferably, studies should report on the crop cultivar and rootstock, planting density or plant spacing, fraction of ground cover (fc), crop height (h), crop age and training systems. Additional information was collected on pruning and irrigation method and strategy. The ranges of reported Kc and Kcb values were grouped according to crop density in relation with fc, h, and the training system, namely vase, hedgerow, or trellis systems. Literature collected Kc or Kcb values were compared with previously tabulated Kc and Kcb values, namely in FAO56, to define the standard Kc and Kcb values for the referred selected crops. The tabulated values are, therefore, transferable to other locations and aimed for use in crop water requirement computations and modeling, mainly for irrigation planning and scheduling, and for supporting improved water use and saving in orchards and vineyards.

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Comparison of Shuttleworth–Wallace and Dual Crop Coefficient Method for Estimating Evapotranspiration of a Tea Field in Southeast China

Cited by 8 publications

References 55 publications

Estimating Evapotranspiration of Greenhouse Tomato under Different Irrigation Levels Using a Modified Dual Crop Coefficient Model in Northeast China

Estimating Evapotranspiration of Greenhouse Tomato under Different Irrigation Levels Using a Modified Dual Crop Coefficient Model in Northeast China

Reasons of sprinkler freezing and rotational irrigation for frost protection in tea plantations

Single and basal crop coefficients for estimation of water use of tree and vine woody crops with consideration of fraction of ground cover, height, and training system for Mediterranean and warm temperate fruit and leaf crops

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