Estimating the actual transpiration rate with compensated levels of accumulated radiation for the efficient irrigation of soilless cultures of paprika plants

Shin, Jong Hwa; Park, Jong‐Seok; Son, Jung Eek

doi:10.1016/j.agwat.2013.12.009

Cited by 41 publications

(18 citation statements)

References 31 publications

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“…The alfalfa cultivar used in the present study did not show any significant response of T r to salinity under a level of 38 mM, but the one used in Li et al (2010) showed a sharp decline, which resulted in the rise of WUE. Additionally, other environmental factors in the field condition would also impact the performance of plant WUE, such as light intensity (Shin et al 2014), water and nutrient availability (Claussen 2002;Wang et al 2014b), wind, and rain events (Li et al 2009).…”

Section: Photosynthesis Transpiration and Wuementioning

confidence: 99%

Fine root growth and water use efficiency in alfalfa (Medicago sativaL. cv. Gongong No. 1) planted along a salinity gradient in coastal area of Dalian, Northeast China

Guo

Jin

Wei

et al. 2016

Soil Science and Plant Nutrition

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The response of plant growth to a geographical salinity gradient under the current scenario from inland to seaside implies the possible future trend of plant development in response to sea-level rise driven by global warming. In the present study, alfalfa (Medicago sativa L. cv. Gongnong No. 1) was planted in sites along a salinity gradient in Dalian City, Northeast China. Fine root growth was investigated at three depths of 0-10 cm, 10-20 cm and 20-30 cm. Meanwhile, another control experiment was conducted using potted alfalfa exposed to gradual levels of salinity at the same levels as the salinity gradients in the field to confirm the unique impact of soil salinity on alfalfa physiology. Results from both field and pot experiments indicated that the parameters of net photosynthesis rate (P N), foliar transpiration (T r) and water use efficiency (WUE) all decreased with the increase of gradient from inland to seaside. Root surface area also showed a general decline for all three soil depths, but differences among the three soil depths were not significant. Root diameter was greatest in soils at a depth of 0-10 cm, while root tip number was greatest in soils at a depth of 10-20 cm. All root morphological parameters decreased with salinity level along the geographical gradient from inland to coastal seaside, while both root surface area and root tip number positively correlated with soil ammonium and nitrate contents, respectively. Our results predicted that, driven by seawater intrusion from sea-level rise under global warming, future performance of inland alfalfa may suffer from severe soil salinity through constricting new root egress and elongation. This trend would be mainly driven by soil salinity which reduces photosynthesis by stimulating water loss in alfalfa.

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Section: Photosynthesis Transpiration and Wuementioning

confidence: 99%

Fine root growth and water use efficiency in alfalfa (Medicago sativaL. cv. Gongong No. 1) planted along a salinity gradient in coastal area of Dalian, Northeast China

Guo

Jin

Wei

et al. 2016

Soil Science and Plant Nutrition

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“…Four levels of substrate MCs, 55, 65, 75, and 85%, were used for analyzing the relationship between the substrate EC and transpiration rate. In both cases, as above, the periods with light intensities of 250-400 W·m -2 were used for establishing the relationship according to the previous study (Shin et al, 2014). Water use efficiencies with the supplied water amount and plant growth data, such as the average fruit weight and moisture content, sugar content, fruit shape, number of fruits and nodes, plant height, and LAI were compared among treatments.…”

Section: Methodsmentioning

confidence: 99%

“…Irrigation treatments were applied for 120 days from the transplanting date to 30 Sept 2013. The transpiration amount and water supply were examined using a precise irrigation monitoring and control system, which was developed by Shin et al (2014) and a total of 24 plants was used. The planting density was 3 plants·m -2 and 6 plants in two rockwool slabs were used in each irrigation control system.…”

Section: Methodsmentioning

confidence: 99%

Changes in electrical conductivity and moisture content of substrate and their subsequent effects on transpiration rate, water use efficiency, and plant growth in the soilless culture of paprika (Capsicum annuum L.)

Shin

Son

2015

Hortic. Environ. Biotechnol.

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The moisture content (MC) and electrical conductivity (EC) in substrates are major root-zone environmental factors that affect the transpiration rate and subsequent plant growth in soilless culture. For maintaining optimum root-zone environments, efficient real-time irrigation control is required based on the substrate EC, substrate MC, and transpiration. The objectives of this study were to clarify the relationship between substrate MC and EC and analyze the changes in substrate EC, plant growth, and water use efficiency under different moisture control regimes. Irrigation systems maintaining three regimes of substrate MC (70-85, 60-85, and 50-85%) were set as treatments, and a conventional irrigation using accumulated radiation served as a control. Subsequent changes in the substrate EC and transpiration rate were continuously measured at different substrate MCs, and the relationships between these variables were derived. The transpiration rate was most sensitive to substrate EC at general cultivation conditions of a substrate EC of 2.5 to 4.5 dS·m -1 and a substrate MC of 60 to 85%. The transpiration rate tended to decrease with increasing substrate EC and decreasing substrate MC. More water was consumed in a higher substrate MC, which was controlled within a narrow range of MC. However, substrate EC was well-controlled below 4.5 dS·m -1 in a substrate MC of 70 to 85%.The relationship between the range of substrate MC and the increase in substrate EC was obtained using equations. Although more water was supplied for the control with a substrate MC of 70 to 85%, fruit productivity tended to increase compared to the other substrate MC treatments (60-85 and 50-85%). From the results, it is hypothesized that precise control of root-zone environments can be used to increase fruit productivity and water use efficiency and to minimize plant water stress as well.

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“…A more rational approach for irrigation scheduling is the accumulated radiation method, allowing more closely matched water supply to the ET rate, which is primarily a day time phenomenon depending strongly on solar radiation [14,69,89,108,109]. However, Shin et al [110] indicated that the transpiration rate of soilless paprika (Capsicum annuum) plants did not proportionally increase with an increase in light intensity, especially in high light conditions. For estimating how much energy the crop has received, a light sensor (e.g., pyranometer) is used to measure incident solar radiation.…”

Section: Time Clock Scheduling and The Accumulated Radiation Methodsmentioning

confidence: 99%

Irrigation of Greenhouse Crops

et al. 2019

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Precision agricultural greenhouse systems indicate considerable scope for improvement of irrigation management practices, since growers typically irrigate crops based on their personal experience. Soil-based greenhouse crop irrigation management requires estimation on a daily basis, whereas soilless systems must be estimated on an hourly or even shorter interval schedule. Historically, irrigation scheduling methods have been based on soil or substrate monitoring, dependent on climate or time with each having both strengths and weaknesses. Recently, plant-based monitoring or plant reflectance-derived indices have been developed, yet their potential is limited for estimating the irrigation rate in order to apply proper irrigation scheduling. Optimization of irrigation practices imposes different irrigation approaches, based on prevailing greenhouse environments, considering plant-water-soil relationships. This article presents a comprehensive review of the literature, which deals with irrigation scheduling approaches applied for soil and soilless greenhouse production systems. Irrigation decisions are categorized according to whether or not an automatic irrigation control has the ability to support a feedback irrigation decision system. The need for further development of neural networks systems is required.

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Estimating the actual transpiration rate with compensated levels of accumulated radiation for the efficient irrigation of soilless cultures of paprika plants

Cited by 41 publications

References 31 publications

Fine root growth and water use efficiency in alfalfa (Medicago sativaL. cv. Gongong No. 1) planted along a salinity gradient in coastal area of Dalian, Northeast China

Fine root growth and water use efficiency in alfalfa (Medicago sativaL. cv. Gongong No. 1) planted along a salinity gradient in coastal area of Dalian, Northeast China

Changes in electrical conductivity and moisture content of substrate and their subsequent effects on transpiration rate, water use efficiency, and plant growth in the soilless culture of paprika (Capsicum annuum L.)

Irrigation of Greenhouse Crops

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