Crop coefficient and water consumption of eggplant in no-tillage system and conventional soil preparation

Carvalho, Daniel Fonseca de; Lima, Márcio Emanoel de; Oliveira, Alexsandra Duarte de; Rocha, Hermes Soares da; Guerra, J. G. M.

doi:10.1590/s0100-69162012000400018

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…Nevertheless, users are invited to adopt a 5 to 10% K c correction if considered appropriate for their uses. The study by Carvalho et al (2012) evidenced a consistent reduction of K c mid (std) and K cend (std) when no-till was used, i.e., when crop residues act as a mulch. Nevertheless, it has not been possible to assess the impacts of mulches, which certainly tend to reduce both K c mid and K c end , however depending on the fraction of ground cover, f c , which is rarely reported.…”

Section: Fruit and Pod Vegetable Cropsmentioning

confidence: 77%

“…A number of research studies were performed with mulch, mainly plastic sheets (Carvalho et al, 2012;Melo et al, 2013;Shukla et al, 2013Shukla et al, , 2014Zheng et al, 2013;Biswas et al, 2015;Borges et al, 2015;Yang et al, 2018;Zhang et al, 2018). Their effect was not considered since this review does not refer to the periods before the mid-season when impacts of mulch in lowering E s are greater.…”

Section: Fruit and Pod Vegetable Cropsmentioning

confidence: 99%

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Standard single and basal crop coefficients for vegetable crops, an update of FAO56 crop water requirements approach

Pereira

Paredes

López-Urrea³

et al. 2021

Agricultural Water Management

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Many research papers on crop water requirements of vegetables have been produced since the publication of the FAO56 guidelines in 1998. A review of this literature has shown that determination of crop evapotranspiration (ET c ) using the K c -ET o approach, i.e., the product of the specific crop coefficient (K c ) by the reference evapotranspiration (ET o ), is the most widely-used method for irrigation water management. Consequently, a review was made to provide updated information on the K c values for these crops. The reviewed research provided various approaches to determine K c in its single and dual versions. With this purpose, actual crop ET (ET c act ) was determined with lysimeters, or by performing the soil water balance using measured soil water content and computational models, or by using Bowen ratio energy balance and eddy covariance measurements, or by using remote sensing applications. When determining the basal K c (K cb ), the partitioning of ET c act was evaluated using different approaches, though mainly using the FAO56 dual K c method. Since the accuracy of experimentally-determined K c and K cb values depends upon the procedure used to compute ET o , as well as accuracy in determining and partitioning of ET c act , the adequacy of the measurement requirements for each approach was carefully reviewed. The article discusses in detail the conceptual methodology relative to crop coefficients and the requirements for transferability, namely distinguishing between actual and standard K c and the need to appropriately use the FAO segmented K c curve. Hence, the research papers selected to update and consolidate mid-season and end-season standard K c and K cb were those that computed ET o with the FAO56 PM-ET o equation; and that also used accurate approaches to determine and partition ET c act for pristine, non-stressed cropping conditions. Under these experimental conditions, the reported K c and K cb values relative to the mid-and end-season could be considered as transferable standard K c and/or K cb values after adjustment to the standard climate adopted in FAO56, where average RH min = 45% and average u 2 = 2 m s −1 over the mid-season and late season growth stages. For each vegetable crop, these standard values were then compared with the FAO56 tabulated K c and K cb values to define the updated values tabulated in the current article. In addition, reported ancillary data, such as maximum root zone depth, maximum crop height, and soil water depletion fraction for no water stress, were also collected from selected papers and tabulated in comparison with those given for the crops in FAO56. The presentation of updated crop coefficient results is performed by grouping the vegetables differently than in FAO56, where distinction is made according to their edible parts:(1) roots, tubers, bulbs and stem vegetables; (2) leaves and flowers vegetables; (3) fruit and pod vegetables; and (4) herbs, spices and special crops, with most of them being newly introduced herein. The updated K c and K cb of veget...

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Section: Fruit and Pod Vegetable Cropsmentioning

confidence: 77%

Section: Fruit and Pod Vegetable Cropsmentioning

confidence: 99%

Standard single and basal crop coefficients for vegetable crops, an update of FAO56 crop water requirements approach

Pereira

Paredes

López-Urrea³

et al. 2021

Agricultural Water Management

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“…For Carvalho et al (2012), when using crop coefficients (Kc) for the estimation of evapotranspiration of a certain crop (ETc), it is important to identify the origin of Kc provided that the ETo estimation follows the same method and criteria originally adopted in the determination of Kc, indicating the necessity of determination and/or calibration for local cultivation conditions. In general, there was a reduction in mean daily ETc and Kc with the increase in the attenuation of solar radiation (black nets) and, among the colored shading nets, the highest values of ETc and Kc were obtained using green Frontinet ® , red ChromatiNet ® and blue ChromatiNet ® .…”

Section: Resultsmentioning

confidence: 99%

Water requirements and crop coefficients of tropical forest seedlings in different shading conditions

Monteiro

Silva

Souza

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective was to determine the crop evapotranspiration (ETc) and crop coefficients (Kc) of tropical forest seedlings over a 135-day cycle, in the climatic conditions of the Cerrado-Amazon transitional region (11º 51' 08 "S; 55º 30' 56" W; altitude of 371 m). Five native species (Tabebuia impetiginosa, Tabebuia roseoalba, Handroanthus chrysotrichus, Parkia pendula and Parkia platycephala) and one exotic species (Adenanthera pavonina) were evaluated in seven shading conditions: 35, 50 and 80% black nets (Polyolefin); green Frontinet®, red ChromatiNet® and blue ChromatiNet® of 50% shading; and full sun. Reference evapotranspiration (ETo) was obtained by the Penman-Monteith FAO-56 method and the crop evapotranspiration of the seedlings (ETc) was given by daily weighing. The Kc values were obtained by dividing ETo by ETc. At 135 DAT, destructive analysis was performed to determine the leaf area. In full sun conditions, ETc varied from 3.9 (P. pendula) to 5.0 mm d -1 (T. roseoalba). The increase in the shading percentage promotes reduction in leaf area, ETc and Kc. Colored nets with 50% shading generate similar water demands.Necessidades hídricas e coeficientes de cultivo de mudas florestais tropicais em diferentes condições de sombreamento R E S U M O Objetivou-se, com este trabalho, determinar a evapotranspiração da cultura (ETc) e os coeficientes de cultivo (Kc) de mudas florestais tropicais, ao longo de 135 dias de ciclo, nas condições climáticas da transição Cerrado-Amazônia. Foram avaliadas cinco espécies nativas (Tabebuia impetiginosa, Tabebuia roseoalba, Handroanthus chrysotrichus, Parkia pendula e Parkia platycephala) e uma exótica (Adenanthera pavonina) em sete condições de sombreamento: telas poliolefinas pretas de 35, 50 e 80%; frontinet verde, chromatinet vermelha e chromatinet azul a 50% sombreamento e pleno sol. A evapotranspiração de referência (ETo) foi obtida pelo método de Penman-Monteith FAO-56 e a evapotranspiração real das mudas (ETc) foi dada por pesagem diária. Os valores de Kc foram obtidos pela razão entre ETo e ETc; aos 135 dias após o transplantio realizou-se a análise destrutiva para determinação da área foliar. Nas condições de pleno sol a ETc variou de 3,9 (P. pendula) a 5,0 mm d -1 (T. roseoalba). O aumento do percentual de sombreamento proporciona diminuição da área foliar, da ETc e do Kc; enfim, as telas coloridas com 50% de sombreamento geram demandas hídricas semelhantes.

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“…Each crop will have a set of specific crop coefficient and will predict different water use for different crops for different growth stages. The K c factor for the Brinjal crop varies from 1.05 to 1.19 and 0.94 to 0.99 at different crop stages under conventional till and non-conventional till [9].…”

Section: Crop Coefficientmentioning

confidence: 99%

Model Validation of Aqua Crop for Brinjal (Solanum melongena) Crop at Madakasira Region, Anantapur District, Andhra Pradesh

Sivamma¹,

Sairam²,

Raghavendra³

et al. 2021

CJAST

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Crop simulation models plays a vital role for estimating the effects of soil, water, nutrients on grain and biomass yields and water productivity of different crops. Among the various crop simulation models, Aqua Crop model was adopted for the predicting the crop water requirement in the Madakasira region, Anantapur district, Andhra Pradesh. The Brinjal crop was selected for the study and was irrigated through two different methods i.e., drip and flood irrigation. The model generated the crop yield and crop water requirement for the drip and flood irrigation of Brinjal crop was compared with the actual field results of crop yield and crop water requirement. The simulated crop yield and crop water requirement for the Brinjal crop under flood irrigation was 5.23 t/ha and 326 mm. The actual crop yield and crop water requirement for the Brinjal crop under flood irrigation was 4.2 t/ha and 335 mm. The simulated crop yield and crop water requirement for the Brinjal crop under Drip irrigation was 5.76 t/ha and 318.3 mm. The actual crop yield and crop water requirement for the Brinjal crop under drip irrigation was 4.8 t/ha and 290 mm. From the results, it was clear that the model simulated the actual conditions of the crop. The benefit cost ratio was done for the experimental field data which clearly shows that the crop yield under drip irrigation has achieved the higher cost benefit ratio. Therefore, Aqua Crop model was suitable for simulating the crop conditions under any circumstances.

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Crop coefficient and water consumption of eggplant in no-tillage system and conventional soil preparation

Cited by 8 publications

References 10 publications

Standard single and basal crop coefficients for vegetable crops, an update of FAO56 crop water requirements approach

Standard single and basal crop coefficients for vegetable crops, an update of FAO56 crop water requirements approach

Water requirements and crop coefficients of tropical forest seedlings in different shading conditions

Model Validation of Aqua Crop for Brinjal (Solanum melongena) Crop at Madakasira Region, Anantapur District, Andhra Pradesh

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