Estimation of Evapotranspiration and Crop Coefficient of Rain-Fed Tea Plants under a Subtropical Climate

Zheng, Shenghong; Ni, Kang; Ji, Lingfei; Zhao, Chenguang; Hong-ling, Chai; Yi, Xiaoyun; He, Weiming; Ruan, Jianyun

doi:10.3390/agronomy11112332

Cited by 9 publications

(8 citation statements)

References 47 publications

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“…Leachate volume was determined gravimetrically and subsamples were collected from each bottle for drainage and nitrate analysis. Please refer to our previous study reported by Zheng et al, 2021 for detailed information on the installation of lysimeters and the collection of water samples.…”

Section: Sample Collection Methodsmentioning

confidence: 99%

“…Meteorological data were automatically collected by a weather station located about 100 meters from the research site, and soil moisture was monitored using soil moisture sensors as described in our previous study reported by Zheng et al, 2021. The average temperature and rainfall during the experiment are shown in Fig.…”

Section: Soil Solution Extraction Using Ceramic Suction Cupsmentioning

confidence: 99%

“…Based on the results from our previous study (Zheng et al 2021), for BY1, Kc was set to 0.71 to calculate evapotranspiration. When the rainfall exceeded 78.02 mm, the drainage ux was xed at the maximum value of 20.63 mm.…”

Section: Comparison Of Drainage Flux and Leachate Volume Calculationmentioning

confidence: 99%

“…The reason for this may rely on the soil structure. From the perspective of soil texture, this experiment was conducted in a relatively heavy clay tea plantation, where the clay content within the top meter of soil ranged from 62.53-69.99% (Zheng et al, 2021). Under such soil conditions, nitrate nitrogen is likely to be transported downward through preferential ow.…”

Section: Effect Of Rainfall On the Application Of The Water Balance M...mentioning

confidence: 99%

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Comparative Research on Monitoring Methods for Nitrate Nitrogen Leaching in Tea Plantation Soils

zheng,

Chai,

Ning

et al. 2024

Preprint

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Background and aims Great concern has long been raised about nitrate leaching in cropland due to its possible environmental side effects in ground water contamination. we conducted a comparative study on monitoring methods for nitrate N leaching in tea plantation soils.Methods Here we employed two common techniques to measure nitrate leaching in tea plantation soils in subtropical China. Using drainage lysimeter as a reference method, the adaptability of estimating drainage and nitrate leaching by combining the water balance equation with the suction cup technique was investigated.Results The final cumulative leachate volume for the calculated and measured method was 721.43 mm and 729.92 mm respectively during the study period. Meanwhile, The cumulative nitrate leaching loss from the lysimeter and suction cup-based method was 47.45 kg ha− 1 and 43.58 kg ha− 1 under lysimeter nitrate concentrations ranging from 7 mg L− 1 to 13 mg L− 1, 156.28 kg ha− 1 and 79.95 kg ha− 1 under lysimeter nitrate concentrations exceeding 13 mg L− 1.Conclusion The suction cup-based method could be an alternative way of monitoring nitrate leaching loss within a certain range of nitrate concentrations in leachate. Besides, lower results occurred in suction cup samplers due to lack of representative samples which mainly leached via preferential flow when in strong leaching events. Thus, it is advisable to increase sampling frequency under such special conditions. The results of this experiment can serve as a reference and guidance for the application of ceramic cups in monitoring nitrogen and other nutrient-ion leaching in tea plantation soils.

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Section: Sample Collection Methodsmentioning

confidence: 99%

Section: Soil Solution Extraction Using Ceramic Suction Cupsmentioning

confidence: 99%

Section: Comparison Of Drainage Flux and Leachate Volume Calculationmentioning

confidence: 99%

Section: Effect Of Rainfall On the Application Of The Water Balance M...mentioning

confidence: 99%

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Comparative Research on Monitoring Methods for Nitrate Nitrogen Leaching in Tea Plantation Soils

zheng,

Chai,

Ning

et al. 2024

Preprint

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“…In order to obtain the monthly water requirement of tomatoes grown in solariums (ETRo), the calculated PET data, must be converted using the correction coefficients, specific to the crop considered [72]. The culture coefficients Kc, for the tomatoes grown in solarium at Husasău de Tinca, were determined experimentally, both for the WM variant and for the MBF variant [63].…”

Section: Water Consumption Of Tomatoes Grown In Solariums In Husasău ...mentioning

confidence: 99%

Effectiveness of Measures to Reduce the Influence of Global Climate Change on Tomato Cultivation in Solariums. Case Study: CrișUrilor Plain, Bihor, Romania

Cărbunar¹,

Mintaș²,

Sabău³

et al. 2022

Preprint

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Tomatoes, one of the most appreciated vegetables consumed, are crops well adapted for cultivation in arid and semi-arid conditions, the success of large yields is guaranteed by covering water consumption through irrigation. Solar Pumps - SP are driven by Photovoltaic Panels - PV (SPAPV), eliminating the dependence on electricity or diesel; they are environmentally friendly because they generate carbon-free electricity and the cost of operation and maintenance is lower. In order to preserve the water administered by drip to the tomato crop grown in solariums, mulching is used. In Husasău de Tinca, in the Crișurilor Plain, cultivation of tomato varieties without mulching (WM) and with mulching with black foil (MBF) were studied. To answer the question "How effective are water conservation measures in terms of energy independence?", two variants of SPAPVs, direct pumping (ADP) and storage tank (AST) were simulated. Considering the conditions in the solariums, tomato crops do not benefit from the contribution of precipitation, therefore it is proposed to determine the water consumption of tomatoes (ETRo), using the temperatures inside the solarium. In 2016, the average temperatures during the vegetation period were observed with an insurance of over 20 %, the irrigation norms were 6945.7 m3 ha-1, for the WM variant and 6594.0 m3 ha-1 for the MBF variant, respectively. Specific Investment (SI) is 214,795 Euro ha-1 in case of ADP and respectively 202,990 Euro ha-1 in case of ATS. The payback period (IPT) is between 2.68 years and 2.53 years for the ADP variant and between 1.63 years and 1.54 years for the ATS variant, respectively. The indications for water use and irrigation water use show that in the MBF variant the water administered by localized irrigation is better utilized than in the WM variant. In the conditions of Crișurilor Plain, the best solution for the distribution of water in solariums, with the help of SPAPVs is the mulching system of tomatoes grown in solariums (MBF) and the arrangement of the drip irrigation system with a water storage tank (ATS).

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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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Estimation of Evapotranspiration and Crop Coefficient of Rain-Fed Tea Plants under a Subtropical Climate

Cited by 9 publications

References 47 publications

Comparative Research on Monitoring Methods for Nitrate Nitrogen Leaching in Tea Plantation Soils

Comparative Research on Monitoring Methods for Nitrate Nitrogen Leaching in Tea Plantation Soils

Effectiveness of Measures to Reduce the Influence of Global Climate Change on Tomato Cultivation in Solariums. Case Study: CrișUrilor Plain, Bihor, Romania

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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