Sensor placement for soil water monitoring in lemon irrigated by micro sprinkler

Coelho, E. F.; Santos, Delfran Batista dos; Azevedo, Carlos Alberto Vieira de

doi:10.1590/s1415-43662007000100006

Cited by 19 publications

(14 citation statements)

References 7 publications

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“…This result is in agreement with Green et al (2006) and should be considered in irrigation schedules that use soil water sensors, since the effective zones of water extraction are commonly indicated for sensor placement in the field (Coelho et al, 2007). The variations of available soil water ( Figure 2) were more intense in the area limited by the dashed lines, in all treatments.…”

Section: Resultssupporting

confidence: 86%

Estimating water application efficiency for drip irrigation emitter patterns on banana

Silva

Coelho

Miranda

et al. 2009

Pesq. agropec. bras.

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-The objective of this work was to evaluate root and water distribution in irrigated banana (Musa sp.), in order to determine the water application efficiency for different drip irrigation emitter patterns. Three drip emitter patterns were studied: two 4-L h -1 emitters per plant (T1), four 4-L h -1 emitters per plant (T2), and five 4-L h -1 emitters per plant (T3). The emitters were placed in a lateral line. In the treatment T3, the emitters formed a continuous strip. The cultivated area used was planted with banana cultivar BRS Tropical, with a 3-m spacing between rows and a 2.5-m spacing between plants. Soil moisture and root length data were collected during the first production cycle at five radial distances and depths, in a 0.20x0.20 m vertical grid. The experiment was carried out in a sandy clay loam Xanthic Hapludox. Soil moisture data were collected every 10 min for a period of five days using TDR probes. Water application efficiency was of 83, 88 and 92% for the systems with two, four and five emitters per plant, respectively. It was verified that an increase in the number of emitters in the lateral line promoted better root distribution, higher water extraction, and less deep percolation losses.Index terms: Musa spp., root distribution, rootzone processes, TDR, water use efficiency. Estimativa da eficiência de aplicação de água em bananeira com diferentes sistemas de gotejamentoResumo -O objetivo deste trabalho foi avaliar a distribuição de água e raízes de bananeira (Musa sp.) irrigada, para determinar a eficiência de aplicação de água por diferentes sistemas de irrigação por gotejamento. Foram estudados três sistemas de gotejamento: T1, dois emissores de 4 L h -1 por planta; T2, quatro emissores de 4 L h -1 por planta; e T3, cinco emissores de 4 L h -1 por planta. Os emissores foram dispostos em uma linha lateral. No tratamento T3, os emissores formaram uma faixa contínua. A área de cultivo foi plantada com bananeira cultivar BRS Tropical com espaçamento de 3 m entre fileiras e de 2,5 m entre plantas. Dados de umidade e comprimento de raízes foram coletados durante o primeiro ciclo da cultura, em cinco distâncias radiais e profundidades, em uma malha vertical de 0,20x0,20 m. O solo da área experimental era um Latossolo Amarelo franco-argilo-arenoso. Os dados de umidade foram coletados em intervalos de 10 min por um período de cinco dias com uso de sondas de TDR. A eficiência de aplicação de água foi de 83, 88 e 92% para os sistemas com dois, quatro e cinco emissores por planta, respectivamente. O incremento no número de emissores na linha lateral promove melhor distribuição radicular, maior extração de água e menores perdas por percolação profunda.Termos para indexação: Musa spp., distribuição radicular, processos radiculares, TDR, eficácia na utilização da água.

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Section: Resultssupporting

confidence: 86%

Estimating water application efficiency for drip irrigation emitter patterns on banana

Silva

Coelho

Miranda

et al. 2009

Pesq. agropec. bras.

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“…This may lead to uncertainties in the estimation of ET since the soil moisture variation in the crop root zone is not fully controlled. There is a wide variation in the number of points used to monitor soil moisture in studies for determining the depletion of soil water storage when estimating evapotranspiration or crop water extraction (Andreu et al, 1997;Green and Clothier, 1995;Wu et al, 1999;Green and Clothier, 1999;Palomo et al, 2002;Coelho et al, 2007;Silva et al, 2009b;Silva et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Water extraction variability in the banana root zone affects the reliability of water balance

Silva

Coelho

Filho

2015

Sci. agric. (Piracicaba, Braz.)

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Spatial and temporal variability of soil water extraction from the root zone affect soil water balance determination. The number of sensors installed in the root zone in studies addressing water balance is still set arbitrarily. This study provided an investigation of the water extraction process by banana (Musa spp.) roots by (i) determining the variability of water extraction from the banana tree root zone, (ii) detecting differences in the estimation of evapotranspiration (ET) by the soil water balance method when the number of soil profiles monitored in the roots zone varies, (iii) and; determining the minimum number of Time Domain Reflectometry (TDR) probes needed to obtain ET precision and accuracy similar to that determined by a drainage lysimeter. The field experiment was conducted in Cruz das Almas, in the state of Bahia, Brazil, where a drainage lysimeter was installed on a banana plantation. The water extraction in the banana root zone was quantified by the water content variations monitored in 72 points by TDRs, with measurements at 15-min intervals. The variability of water extraction in the banana root zone was medium to high. The range of variability affects the reliability of the crop evapotranspiration calculation by the soil water balance method. To prevent an overestimation of banana evapotranspiration, the water extraction in the soil profile must be monitored with at least 16 TDR probes installed at a minimum distance of 0.9 m and a minimum depth of 0.7 m.

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“…Thus, knowledge of the architecture of the root system of any culture constitutes an important tool for the development of a good irrigation project, since the understanding of root distribution in the soil is basic to determine the required amount of water to be applied and define the most appropriate positioning of sensors to monitor soil moisture (COELHO et al, 2007;NEVES et al, 2008;RAMOS, et al, 2009;COELHO et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Root system distribution of sugarcane irrigated with domestic sewage effluent aplication by subsurface drip system

Sousa¹,

Matsura

Elaiuy³

et al. 2013

Eng. Agríc.

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Irrigation with domestic sewage effluent (DSE) has been recommended by subsurface dripping, as it can obtain a high rate of irrigation efficiency and faster use of salts in comparison with other irrigation methods. The study aimed at evaluating the area, the length and the effective depth of the root system of sugarcane irrigated with DSE by subsurface drip system and with different irrigation rates at depths of 0. 00-0.20, 0.20-0.40, 0.40-0.60 and 0.60-0.80m. The experiment was carried out in the municipality of Piracicaba, in the state of São Paulo (SP), Brazil, in a sugarcane area irrigated with DSE in a completely randomized blocks set up in furrows, with three replications and four treatments, which are: one area without irrigation (AWI) and three irrigated areas meeting 50% (T50%), 100% (T100%) and 200% (T200%) of the crop's water need between each round of irrigation. T100% and T200% provided smaller areas and lengths of roots in the two deepest layers, as compared to AWI and T50%, which stimulated the development of deeper roots due to the water stress. TWI, T100% and T200% presented 80% of the roots up to a depth of 0.40m and T50% treatment presented 76.43% of roots total. KEYWORDS:Root; water reuse; subsurface drip. DISTRIBUIÇÃO DO SISTEMA RADICULAR DA CANA-DE-AÇÚCAR IRRIGADA COM EFLUENTE DE ESGOTO DOMÉSTICO POR GOTEJAMENTO SUBSUPERFICIAL RESUMO:A irrigação com efluente de esgoto doméstico (EED) tem sido recomendada para aplicação por gotejamento subsuperficial, podendo-se obter elevados índices de eficiência de irrigação e mais rápido aproveitamento dos sais em comparação com outros métodos de irrigação. O trabalho objetivou avaliar a área de raiz, o comprimento e a profundidade efetiva do sistema radicular da cana-de-açúcar irrigada com EED aplicado por gotejamento subsuperficial e com diferentes lâminas de irrigação, nas camadas de solo de 0,00-0,20; 0,20-0,40; 0,40-0,60 e 0,60-0,80 m. O experimento foi realizado em Piracicaba-SP, numa área de cana-de-açúcar irrigada com EED, em um delineamento de blocos casualizados dispostos no esquema de faixas, com três repetições e quatro tratamentos, sendo estes: uma área sem irrigação (TSI) e três áreas irrigadas, atendendo a 50% (T50%), 100% (T100%) e 200% (T200%) da necessidade hídrica da cultura entre cada turno de rega. O T100% e o T200% proporcionaram menores áreas e comprimento de raízes nas duas camadas mais profundas, quando comparados ao TSI e ao T50%, que devido ao estresse hídrico, proporcionado à cultura, estimularam o desenvolvimento de raízes mais profundas. O TSI, T100% e T200% apresentaram 80% das raízes até 0,40 m e, nessa mesma profundidade, o tratamento T50% apresentou 76,43% do total de raízes.

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Sensor placement for soil water monitoring in lemon irrigated by micro sprinkler

Cited by 19 publications

References 7 publications

Estimating water application efficiency for drip irrigation emitter patterns on banana

Estimating water application efficiency for drip irrigation emitter patterns on banana

Water extraction variability in the banana root zone affects the reliability of water balance

Root system distribution of sugarcane irrigated with domestic sewage effluent aplication by subsurface drip system

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