Determining evapotranspiration and crop coefficients of young and mature pomegranate trees under drip irrigation*

2021 ◽  
Author(s):  
Hamideh Noory ◽  
Mohamad Abbasnejad ◽  
Hamed Ebrahimian ◽  
Hossein Azadi
Keyword(s):  
Drip Irrigation ◽  
Crop Coefficients

Developing crop coefficients and pan coefficient for greenhouse-grown tomato under drip irrigation

2013 ◽  
Author(s):  
Weixia Zhao ◽  
Jiusheng Li ◽  
Zhen Wang ◽  
PhD Student ◽  
Yanfeng Li ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Pan Coefficient ◽  
Crop Coefficients

scholarly journals Simplified Water Requirement Calculators for Fruits and Vegetables

2016 ◽  
Vol 26 (4) ◽  
pp. 530-541 ◽  
Author(s):  
Brent Rowell ◽  
Mar Lar Soe
Keyword(s):  
Drip Irrigation ◽  
Fruits And Vegetables ◽  
Canopy Cover ◽  
Crop Coefficient ◽  
Climatic Data ◽  
Vegetable Crops ◽  
Rotating Disc ◽  
Water Requirements ◽  
Water Wheel ◽  
Crop Coefficients

New users of drip irrigation in Myanmar had no idea how much water to apply to their crops with drip and could not afford tensiometers or other soil moisture monitoring tools. The concept of a simple paper calculator was born out of their need for an easy-to-use yet inexpensive tool to estimate horticultural crop water requirements. We used a generalized crop coefficient and growth stage approach together with average evapotranspiration (ET) for the vegetable crops “Water Wheel” calculator and a canopy cover approach for the tree fruit calculator. Differences among published crop coefficients are relatively small for a large number of vegetables and single coefficients were used for groups of crops without putting farmers’ crops at risk. Vegetable crops were divided into two groups based on whether water requirements during harvest remained the same as for the flowering and fruiting stage or were reduced for the harvest period. A simplified canopy cover approach was used to determine water requirements for perennial fruit, tree, and vine crops. Our faith in the ability of farmers to make their own adjustments gave us confidence to simplify ET-based water requirements and make them available in the form of simple rotating disc calculators printed in color on laminated card stock. The calculators were welcomed by our staff and enabled them to provide reasonably reliable recommendations for new users of drip irrigation. When surveyed, field staff responded that 74% of farmers they advised followed Water Wheel recommendations. Rough estimates of fruit and vegetable water requirements reached a large number of new drip users in a form they could easily understand, thereby lowering adoption barriers for an unfamiliar technology. This paper describes the Water Wheel concept and design so nonspecialists might develop their own calculators using local climatic data.

scholarly journals Response of Chosen American Asparagus officinalis L. Cultivars to Drip Irrigation on the Sandy Soil in Central Europe: Growth, Yield, and Water Productivity

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 864
Author(s):  
Roman Rolbiecki ◽  
Stanisław Rolbiecki ◽  
Anna Figas ◽  
Barbara Jagosz ◽  
Piotr Prus ◽  
...  
Keyword(s):  
Central Europe ◽  
Sandy Soil ◽  
Drip Irrigation ◽  
Water Productivity ◽  
Growth Yield ◽  
Asparagus Officinalis ◽  
Marketable Yield ◽  
Increase In Productivity ◽  
Crop Coefficients ◽  
Positive Effect

The aim of this study was to verify the response of 13 American asparagus cultivars cultivated for green spear on surface postharvest drip irrigation. Irrigation, used to compensate for periodic deficiencies in precipitation, allows for high- and good-quality crops for many species. The field experiment was carried out in 2006–2008 on a very light sandy soil in central Europe (Poland). Irrigation treatments were applied using the tensiometer indications. Water requirements of asparagus were calculated on the base of reference evapotranspiration and crop coefficients. The following evaluations were made: Height, diameter, and number of summer stalks, as well marketable yield, weight, and number of consumption green spears. Drip irrigation applied for 2 years (2006–2007) in the postharvest period had a positive effect on all studied traits in both summer stalks and green spears in 2007–2008. A significant increase in the height, number, and diameter of summer stalks, as well an increase in the marketable yield, weight, and number of green spears was observed for most of the cultivars. In general, postharvest drip irrigation of asparagus cultivated in very light sandy soil significantly contributes to the increase in productivity of American cultivars of this species.

scholarly journals GENÓTIPOS DE CAFÉ CONILON SOB AJUSTE DE DIFERENTES COEFICIENTES DE CULTURA AJUSTADOS

Irriga ◽  
2017 ◽  
Vol 22 (2) ◽  
pp. 236-248
Author(s):  
Diego Zancanella Bonomo ◽  
Robson Bonomo ◽  
Fábio Luiz Partelli ◽  
Joabe Martins de Souza
Keyword(s):  
Drip Irrigation ◽  
Irrigation Management ◽  
Coffea Canephora ◽  
Espírito Santo ◽  
Coffee Beans ◽  
Crop Coefficients ◽  
Espirito Santo ◽  
E Mail ◽  
Best Parameters

GENÓTIPOS DE CAFÉ CONILON SOB AJUSTE DE DIFERENTES COEFICIENTES DE CULTURA AJUSTADOS  DIEGO ZANCANELLA BONOMO1; ROBSON BONOMO2; FÁBIO LUIZ PARTELLI2 E JOABE MARTINS DE SOUZA3 1Engenheiro Agrônomo, Mestre em Agricultura Tropical, Departamento de Ciências Agrárias e Biológicas CEUNES/UFES, São Mateus, ES. E-mail: [email protected] Doutor do Departamento de Ciências Agrárias e Biológicas, Universidade Federal do Espírito Santo, CEUNES/UFES, São Mateus, ES. E-mail: [email protected];  [email protected]. 3Pós-Doutorando no Centro Universitário Norte do Espírito Santo da Universidade Federal do Espírito Santo, e-mail: [email protected].  1 RESUMO  Objetivou-se com esse trabalho avaliar diferentes genótipos de café Conilon sob ajustes de diferentes coeficientes de cultura ajustado (Kcajust). O delineamento experimental foi o inteiramente casualizado em parcela subdividida com quatro repetições, sendo seis parcelas de lâminas de irrigação, aplicadas com a substituição do Kc por coeficientes aqui denominados de Kcajust, (0,25; 0,50; 0,75; 1,00; 1,25; 1,50 % da ETloc). As subparcelas foram cinco diferentes genótipos, 02 e 03 da variedade ‘Vitória Incaper 8142’, genótipo 153 da variedade ‘Emcapa 8131’, e o genótipo "bamburral" e 18. Avaliou-se, a produtividade, o rendimento e a classificação dos grãos de café em peneira, em cada genótipo e safra. O genótipo "bamburral" e 153 obtiveram uma produtividade de 124 sc ha-1 (Kcajust= 1,07) e 114 sc ha-1 respectivamente. Os genótipos 02 e 03 apresentaram máxima produtividade com Kcajust de 0,91 (105 sc ha-1) e 0,96 (96,56 sc ha-1), e melhor rendimento para o Kcajust igual à 1,01 (genótipo 02), e pior para Kcajust igual à 1,15 (genótipo 03). Os genótipos e as safras apresentaram-se diferentes quando ao Kcajust para a produtividade e rendimento, e uma variação no percentual de grãos retidos em peneira para o genótipo 03. O Kcajust igual a 1,00 proporcionou os melhores parâmetros. Palavras-chave: Coffea canephora, produtividade, peneira, gotejamento, manejo irrigação.  BONOMO, D. Z.; BONOMO, R.; PARTELLI, F. L.; SOUZA, J. M.PERFORMANCE OF CONILON COFFEE GENOTYPES UNDER DIFFERENT ADJUSTED CROP COEFFICIENTS  2 ABSTRACT The objective of this work was to evaluate Conilon coffee genotypes submitted to different adjusted crop coefficients (Kcajust). The experimental delineation was a completely randomized in split plot with six plots as irrigation depths, which has replaced Kc by a coefficient here denominated Kcajust (0.25, 0.50, 0.75, 1.00, 1 25, 1.50) corresponding to evapotranspiration percentages for localized irrigation, five subplots (genotypes) and four replications. Productivity, yield and classification of coffee beans in sieve in each genotype and harvest were assessed. The genotype "bamburral" and 153 obtained yield of 124 sacks ha-1 (Kcajust = 1.07) and 114 sacks ha-1 respectively. Genotypes 02 and 03 of variety 'Victoria Incaper 8142' presented maximum productivity with Kcajust 0.91 (105 sacks ha-1) and 0.96 (96.56 sacks ha-1). Genotype 02 presented the best yield (Kcajust = 1.01; 4.32 sacks harvested by sacks benefitted), and genotype 03 was the worst (Kcajust = 1.15, 4.75 sacks harvested by benefitted sacks). Genotypes and harvests had behavior differentiated when the Kcajust for productivity and yield while also providing a variation in the percentage of grain retained in sieve for genotype 03. The Kcajust equal to 1.00 showed the best parameters. Keywords: Coffea canephora, productivity, sieve, drip, irrigation management

Dual crop coefficients for maize in southern Brazil: Model testing for sprinkler and drip irrigation and mulched soil

2013 ◽  
Vol 115 (3) ◽  
pp. 291-310 ◽  
Author(s):  
Juliano D. Martins ◽  
Gonçalo C. Rodrigues ◽  
Paula Paredes ◽  
Reimar Carlesso ◽  
Zanandra B. Oliveira ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Model Testing ◽  
Southern Brazil ◽  
Crop Coefficients

scholarly journals Irrigation modeling in a pear orchard

2010 ◽  
Vol 16 (3) ◽  
Author(s):  
A. Nagy ◽  
Tamás J. ◽  
Fórián T. ◽  
Nyéki J. ◽  
Soltész M. ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Irrigation System ◽  
Research Field ◽  
Lack Of Information ◽  
Irrigation Interval ◽  
Pear Orchard ◽  
Use Efficiency ◽  
Large Water ◽  
Crop Coefficients

The pear has large water requirement, therefore the planting of high density and grass covered pear orchards are needed irrigationconditions in Hungary. Drip irrigation spread in the orchards is due to the 90–95% of water use efficiency. One of the key role of irrigation is theproper determination of evapotranspiration and crop coefficients. As there is a considerable lack of information for different crops or fruits thePenman-Monteith method is used for the estimation of evapotranspiration, using CROPWAT 8.0. The research field was the genetic collection ofpear at Újfehértó, in Hungary, which is situated in Nyírség meso-region. Our aim was to establish drip irrigation at this site. Based on the resultsof CROPWAT irrigation model the mean amount of the total gross irrigation is between 230–270 mm, within 3 irrigation interval regardingclimatic and rainfall data of the last 10 years. In 2009, due to heavy drought, the total gross irrigation was 355,4mm/year on sandy soil calculatingwith 45% total available water depletion in 5 irrigation interval. The sizing of the irrigation system was set to the maximum 0.55 l/s/ha, which is6.3 l/tree/h. 6.3 l/tree/h can be carried out with a drip emitter having 16 mm wing lines diameter, 4 l/h water flow at 3 atm pressure.

scholarly journals Water Use by Drip-irrigated Watermelons on Plastic Mulch

HortScience ◽  
2000 ◽  
Vol 35 (4) ◽  
pp. 556F-557
Author(s):  
David A. Bender ◽  
Roland E. Roberts ◽  
Frank J. Dainello
Keyword(s):  
Water Use ◽  
Drip Irrigation ◽  
Fruit Size ◽  
Growth Stages ◽  
Plastic Mulch ◽  
Yield And Quality ◽  
Moisture Regimes ◽  
Quality Water ◽  
Subsurface Drip ◽  
Crop Coefficients

Watermelon is grown under a range of moisture regimes from rainfed to heavily irrigated, but water requirement patterns are not well documented. Drip irrigation and plastic mulch provide the opportunity to control water applications to optimize yield and quality. Water applied through subsurface drip irrigation was measured in two watermelon trials in 1998 (25 seeded and 20 seedless cultivars) and 1999 (26 seeded and 14 seedless cultivars) at Lubbock, Texas. Melons were transplanted in plastic-covered raised beds 13.6 m long spaced 2 m apart. Irrigation was applied when morning soil moisture tension measured by tensiometers exceeded 20 kPa. Watermelon yields ranged from 50 to 100 t·ha-1 with excellent quality. Weekly water use averaged 14 mm during the first 3 weeks of establishment then increased to 28 mm during the next 3 weeks as plants were running and blooming. During the 5-week fruit-enlargement period, water uptake averaged 57 mm, then decreased as full fruit size was attained. Similar uptake patterns in both years suggest that meaningful crop coefficients for scheduling watermelon irrigation could be based on phenological growth stages.

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