The effect of partial wetting of the root zone on yield and water use efficiency in a drip-and sprinkler-irrigated mature grapefruit grove

Bielorai, H.

doi:10.1007/bf00264852

Cited by 58 publications

(38 citation statements)

References 5 publications

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“…Furthermore, the results of water-saving techniques, such as drip irrigation and sprinkler irrigation, could be monitored using ET data, thus improving water-use efficiency (WUE) and enhancing the ability of farmers to efficiently manage available irrigation water supplies [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

An NDVI-Based Statistical ET Downscaling Method

Tan

Niu

et al. 2017

Water

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This study proposes a new method for downscaling ETWatch 1-km actual evapotranspiration (ET) products to a spatial resolution of 30 m using Landsat8 normalized difference vegetation index (NDVI) data. The NDVI is employed as an indicator of land-surface vegetation, which displays periodic spatial patterns on the land surface. A 30-m-resolution ten-day ET dataset is then calculated primarily using the NDVI and the historical ratio of coarse NDVI and ET that considers different land cover types. Good agreement and correlations were obtained between the downscaled data and observations from three flux sites in two study areas. The mean bias (MB) per ten-day period ranges from 4.21 mm in Guantao to 1.55 mm in Huazhaizi, and the coefficient of determination (R 2 ) varies from 0.87 to 0.95. The downscaling results show good consistency with the original ETWatch 1-km data over both temporal and spatial scales for different land cover types, with R 2 values ranging from 0.82 to 0.98. In addition, the downscaled results capture the progression of vegetation growth well. This study demonstrates the applicability of the new "de-pixelation" downscaling method in the management of water resources.

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Section: Introductionmentioning

confidence: 99%

An NDVI-Based Statistical ET Downscaling Method

Tan

Niu

et al. 2017

Water

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“…In 'Valencia' orange trees, observed through leaf water potential measurements variations in temperature, air humidity and solar radiation conditions influenced leaf water status, but the magnitudes were apparently not enough to affect photosynthetic rates. Bielorai (1982) observed that water use efficiency was greater in the drip-irrigated plots than in the sprinkled ones, and also greater in the plots given the under reduced water applications (80 % of the maximum seasonal amount of the irrigation water applied), as compared with plots receiving the full amount of irrigation.…”

Section: Vegetative Growthmentioning

confidence: 92%

“…Under field conditions, some researchers evaluated fruit production and quality with different percentages of WA (Bielorai, 1982;Koo, 1985;Castel, 1994). In some of these studies, it was not possible to determine with certainty if the effects on fruit production and quality resulted from a reduction in plant transpiration caused by the decrease in the WA.…”

Section: Introductionmentioning

confidence: 99%

Effect of partial soil wetting on transpiration, vegetative growth and root system of young orange trees

Vellame

Júnior

Coelho

2015

Sci. agric. (Piracicaba, Braz.)

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The wetted area fraction is a factor critical to the success of drip irrigation. This study aimed to evaluate the effect of partial soil wetting on transpiration, vegetative growth and root system of young orange trees. The experiment was carried out in a greenhouse where plants were grown in 0.5 m 3 boxes internally divided into compartments. The wetting of 12 % of soil area was tested on two types of soil cultivated with 'Valencia' orange trees grafted onto Rangpur lime and 'Swingle' citrumelo rootstocks. Transpiration was determined in 40 plants. Water extraction and root density were evaluated in the compartments. Transpiration is reduced by restriction in wetted soil area, and such reduction is influenced by the number of days after the beginning of partial irrigation, atmospheric evaporative demand and plant phenological stage.Mean transpiration of plants with partial irrigation was equivalent to 84 % of the mean transpiration of plants with 100 % of wetted soil area in the period studied. However, after 156 days of imposing partial irrigation there was no difference in transpiration between treatments. Plant acclimation was caused by an increase in root concentration in the irrigated area. After a period of acclimation, if the entire root system is wetted, soil water extraction becomes proportional to the percentage of wetted area after a short period of time. Despite the reduction in transpiration, there was no difference between treatments with 12 % and 100 % of wetted soil area in terms of vegetative growth.

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“…Bernardo (1995) and Vermeiren & Jobling (1997) recommend the wetting of 50% of the potential zone root in perennial crops. Results of some recent, long-term experiments evaluating yield and citrus tree development under different levels of wetted area, have agreed that the wetting of around 50% of tree soil surface area is the ideal procedure (Bielorai, 1982;Smajstrla & Koo, 1984;Castel, 1994;Souza et al, 2003). However, Gowing et al (1990) reported reduction of transpiration and leaf expansion in apple trees that had 50% of wetted roots when compared to wellirrigated ones.…”

Section: Leaf Water Potentialmentioning

confidence: 95%

Water relations and photosynthesis as criteria for adequate irrigation management in 'Tahiti' lime trees

Silva¹,

Folegatti²,

Silva³

et al. 2005

Sci. agric. (Piracicaba, Braz.)

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Irrigation scheduling based on soil moisture status is one of the most useful methods because of its practicality and low cost. The effects of available soil water depletion on evapotranspiration (ETc), transpiration (E), leaf water potential at predawn (Ψ P ) and midday (Ψ M ), stomatal conductance (gs) and net CO 2 assimilation (A) in lime 'Tahiti' trees (Citrus latifolia) were evaluated to improve irrigation schedule and minimize water use without causing water stress. The trees were spaced 7 × 4 m and drip-irrigated by four drippers with the available soil water content (AWC) depleted by suspension of irrigation (40 days). Leaf water potential was measured on a pressure chamber (Ψ P and Ψ M ) and leaf gas exchange was measured by infrared gas analyzer (E, gs and A). Evapotranspiration was determined with the aid of weighing lysimeter. Water soil content and potential (Ψ S ) were monitored with TDR probes and tensiometers, respectively, installed at 0.3, 0.6 and 0.9 m depths. Meteorological variables were monitored with an automatic weather station in the experimental area. The threshold AWC level for the onset of ETc decline was 43%, and 60% for gs, A, E and Ψ P . Also, Ψ P was more sensitive to AWC than Ψ M , and is therefore a better tool for irrigation. When AWC was around 60%, values of Ψ P and Ψs were -0.62 MPa and -48.8 kPa, respectively. Key words: evapotranspiration, citrus, lysimeter, gas exchange, tensiometer RELAÇÕES HÍDRICAS E FOTOSSÍNTESE COMO CRITÉRIOS PARA MANEJO ADEQUADO DA IRRIGAÇÃO EM PLANTAS DE LIMEIRA 'TAHITI'RESUMO: Programar práticas de irrigação com base na umidade do solo é um dos métodos mais usuais devido sua praticidade e baixo custo. O efeito do esgotamento da água disponível do solo sobre a evapotranspiração (ETc), transpiração (E), potencial de água na folha ao amanhecer (Ψ P ) e ao meio-dia (Ψ M ), condutância estomática (gs) e assimilação líquida de CO 2 (A) em plantas de limeira 'Tahiti' (Citrus latifolia) foi avaliado para melhorar o manejo da irrigação, minimizando água e evitando o estresse hídrico. As plantas foram espaçadas de 7 × 4 m e irrigadas por quatro gotejadores com a diminuição da água disponível no solo (AD) provocada pela suspensão da irrigação (40 dias). Para as medidas do potencial da água na folha foi utilizado uma câmara de pressão (Ψ P e Ψ M ) e para as medidas de trocas gasosas um analisador de gases por infravermelho (A, E e gs). Foi utilizado um lisímetro de pesagem para a determinação da ETc. A umidade e potencial de água no solo (Ψ S ) foram monitoradas por sondas de TDR e tensiômetros, respectivamente, instalados a 0,3, 0,6 e 0,9 m de profundidade. As variáveis meteorológicas foram monitorados por uma estação agrometeorológica automática na área. O limite de AD na qual a ETc começou a diminuir foi de 43%, ao passo que para gs, A, E e Ψ P foi de 60%. Ainda, o Ψ P foi mais sensível a AD do que as medidas de Ψ M podendo ser recomendado como ferramenta para manejo de irrigação. Quando AD estava próximo de 60%, os valores de Ψ P e Ψ S eram -0,62...

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The effect of partial wetting of the root zone on yield and water use efficiency in a drip-and sprinkler-irrigated mature grapefruit grove

Cited by 58 publications

References 5 publications

An NDVI-Based Statistical ET Downscaling Method

An NDVI-Based Statistical ET Downscaling Method

Effect of partial soil wetting on transpiration, vegetative growth and root system of young orange trees

Water relations and photosynthesis as criteria for adequate irrigation management in 'Tahiti' lime trees

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