Irrigation Techniques and Evaluations

Clemmens, A. J.; Dedrick, Allen R.

doi:10.1007/978-3-642-78562-7_4

Cited by 47 publications

(23 citation statements)

References 5 publications

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“…Hanson et al (1995) reported that the performance of typical surface irrigation systems in California cannot be statistically distinguished from that of pressurized irrigation systems. Clemmens and Dedrick (1994) arrived at a similar conclusion when discussing the potential application efficiency of different irrigation systems. Recent developments in the design and management of surface irrigation have led to new perspectives of an ancient irrigation system that has reached the 21 st century with a dominant position over the new pressurized systems.…”

Section: Introductionmentioning

confidence: 63%

Solute Transport Modeling in Overland Flow Applied to Fertigation

García‐Navarro

Playán

Zapata

2000

J. Irrig. Drain Eng.

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Section: Introductionmentioning

confidence: 63%

Solute Transport Modeling in Overland Flow Applied to Fertigation

García‐Navarro

Playán

Zapata

2000

J. Irrig. Drain Eng.

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“…The opening of the cuvette was set to 2 cm 2 . The g s value for each pot was obtained as the mean value of three-four measurements on leaves of different plants [24]. The g s measurements were conducted immediately after thermal and optical acquisitions, to avoid that the porometer's clamp could significantly affect the leaf temperature.…”

Section: Reference Measurements To Assess the Crop Water Statusmentioning

confidence: 99%

Assessing the Reliability of Thermal and Optical Imaging Techniques for Detecting Crop Water Status under Different Nitrogen Levels

et al. 2017

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Efficient management of irrigation water is fundamental in agriculture to reduce the environmental impacts and to increase the sustainability of crop production. The availability of adequate tools and methodologies to easily identify the crop water status in operating conditions is therefore crucial. This work aimed to assess the reliability of indices derived from imaging techniques-thermal indices (I g (stomatal conductance index) and CWSI (Crop Water Stress Index)) and optical indices (NDVI (Normalized Difference Vegetation Index) and PRI (Photochemical Reflectance Index))-as operational tools to detect the crop water status, regardless the eventual presence of nitrogen stress. In particular, two separate experiments were carried out in a greenhouse, on two spinach varieties (Verdi F1 and SV2157VB), with different microclimatic conditions and under different levels of water and nitrogen application. Statistical analysis based on ANOVA test was carried out to assess the independence of thermal and optical indices from the crop nitrogen status. These imaging indices were successively compared through correlation analysis with reference destructive and non-destructive measurements of crop water status (stomatal conductance, chlorophyll a fluorescence, and leaf and soil water content), and linear regression models of thermal and optical indices versus reference measurements were calibrated. All models were significant (Fisher p-value lower than 0.05), and the highest R 2 values (greater than 0.6) were found for the regression models between CWSI and the soil water content, NDVI and the leaf water content, and PRI and the stomatal conductance. Further analysis showed that imaging indices acquired by thermal cameras (especially CWSI) can be used as operational tools to detect the crop water status, since no dependence on plant nitrogen conditions was observed, even when the soil water depletion was very limited. Our results confirmed that imaging indices such as CWSI, NDVI and PRI can be used as operational tools to predict soil water status and to detect drought stress under different soil nitrogen conditions.

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“…The daily effective precipitation was determined as 75% of daily precipitation (Dastane, 1978). Gross irrigation requirements for both standard (GIR Std ) and RDI (GIR RDI ) strategies were determined assuming an application efficiency of 90%, characteristic of drip irrigation systems (Clemmens & Dedrick, 1994). Gross irrigation requirements for both strategies were compared with observed irrigation water applications based on the criteria of the farm manager.…”

Section: Irrigation Requirementsmentioning

confidence: 99%

Limitations to adopting regulated deficit irrigation in stone fruit orchards: a case study

Zapata

Nerilli

Martı́nez-Cob

et al. 2013

Span. j. agric. res.

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Fruit production development is resulting in large commercial orchards with improved water management standards. While the agronomic and economic benefits of regulated deficit irrigation (RDI) have long been established, the local variability in soils and climate and the irrigation system design limits its practical applications. This paper uses a case study approach (a 225 ha stone fruit orchard) to unveil limitations derived from environmental spatial variability and irrigation performance. The spatial variability of soil physical parameters and meteorology in the orchard was characterized, and its implication on crop water requirements was established. Irrigation depths applied during 2004-2009 were analysed and compared with crop water requirements under standard and RDI strategies. Plant water status was also measured during two irrigation seasons using stem water potential measurements. On-farm wind speed variability amounted to 55%, representing differences of 17% in reference evapotranspiration. During the study seasons, irrigation scheduling evolved towards deficit irrigation; however, the specific traits of RDI in stone fruits were not implemented. RDI implementation was limited by: 1) poor correspondence between environmental variability and irrigation system design; 2) insufficient information on RDI crop water requirements and its on-farm spatial variability within the farm; and 3) low control of the water distribution network.

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Irrigation Techniques and Evaluations

Cited by 47 publications

References 5 publications

Solute Transport Modeling in Overland Flow Applied to Fertigation

Solute Transport Modeling in Overland Flow Applied to Fertigation

Assessing the Reliability of Thermal and Optical Imaging Techniques for Detecting Crop Water Status under Different Nitrogen Levels

Limitations to adopting regulated deficit irrigation in stone fruit orchards: a case study

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