Integrated Management Tool for Water, Crop, Soil and N‐Fertilizers: The Saltmed Model

Ragab, Ragab

doi:10.1002/ird.1907

Cited by 54 publications

(55 citation statements)

References 32 publications

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“…Description of the new version of the SALTMED model, the processes and expected output are given in a separate paper (submitted to the J. of irrigation and Drainage, Ragab, 2014). The crops used in the sites are tomato and potato in Italy, potato in Serbia and tomato in Greece (Crete).…”

Section: Methodsmentioning

confidence: 99%

SALTMED Model as an Integrated Management Tool for Water, Crop, Soil and N‐Fertilizer Water Management Strategies and Productivity: Field and Simulation Study

Ragab

Battilani²,

Matović

et al. 2015

Irrigation and Drainage

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This paper is a follow up from the first paper which described the SALTMED model. In this paper the focus is on the model application using data of tomato and potato from field experiments in Italy, Greece (Crete) and Serbia. Drip full irrigation, drip deficit irrigation, drip as partial root drying (PRD), sprinkler and furrow irrigation were used in three years experiment between 2006 and 2008.In drip irrigated experiments, the drip line was 10 to 12 cm below the surface. Dry matter, final yield, soil moisture and soil nitrogen were successfully simulated. The study showed that there is a great potential for saving water when using subsurface drip, PRD or drip deficit irrigation compared with sprinkler and furrow irrigation. Depending on the crop and irrigation system, the amount of fresh water that can be saved could vary between 14 to 44%. PRD and deficit drip irrigation have proved to be the most efficient water application strategies with the highest water productivity.

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Section: Methodsmentioning

confidence: 99%

SALTMED Model as an Integrated Management Tool for Water, Crop, Soil and N‐Fertilizer Water Management Strategies and Productivity: Field and Simulation Study

Ragab

Battilani²,

Matović

et al. 2015

Irrigation and Drainage

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“…In order to study the soil moisture and salinity distribution within root-zone soil we used a SALTMED model -a physical mathematical model that uses water and solute transport, evapotranspiration and water-uptake equations (Ragab 2015). The modelling was carried out using experimentally measured crop and soil parameters along with crop coefficients Kc and Kcb values from FAO-56 (Allen et al, 1998).…”

Section: Mathematical Modellingmentioning

confidence: 99%

Effects of drip-irrigation regimes with saline water on pepper productivity and soil salinity under greenhouse conditions

Rameshwaran

Tepe²,

Yazar

et al. 2016

Scientia Horticulturae

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Article (refereed) -postprint Rameshwaran, Ponnambalam; Tepe, Akin; Yazar, Attila; Ragab, Ragab. 2016. Effects of drip-irrigation regimes with saline water on pepper productivity and soil salinity under greenhouse conditions. Contact CEH NORA team at noraceh@ceh.ac.ukThe NERC and CEH trademarks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner. AbstractThe aim of this study was to investigate the response of sweet pepper (Capsicum annuum L.) to saline irrigation water and various irrigation regimes. The experiments were conducted in a greenhouse with two sweet pepper varieties (ONUR F1 and ADA F1) over two cropping seasons: Spring and Autumn on the Mediterranean coast at Antalya, Turkey. The irrigation regimes comprised four levels of Class A pan-evaporation and were applied using a drip irrigation system when evaporation reached a target value of around 10 mm. These four levels represented 0.50, 0.75, 1.00 and 1.25 of Class A panevaporation. In each irrigation regime the sweet pepper plants were exposed to four salinity treatments with electrical conductivities of 1.0, 2.5, 3.5 and 6.0 dS m -1 respectively. The study showed that both pepper varieties generally performed in a similar manner (except in terms of vegetative biomass production). The amount of salt accumulation within the root-zone was higher in Spring compared to Autumn; and therefore related to the total amount of irrigated water usage between seasons due to climatic variability. Increased salinity induced higher levels of salt accumulation within the pepper plant's root-zone, while an increased amount of saline irrigation water increased the size of the affected layer within the root-zone. Overall, an increased level of salinity alongside increased irrigation considerably depressed both vegetative growth and yield. Higher irrigation water productivities were attained with a regime comprising 0.50 of Class A pan-evaporation and which appeared to fulfil crop water requirements. It was found that sweet pepper varieties ONUR F1 and ADA F1 are moderately sensitive to salinity with a threshold value of 1.43 dS m -1 and a decreasing slope value of 11.1%.Although both seasons revealed a single salinity response function, there were considerable differences in the actual fresh pepper yield. This study demonstrates that for pepper crops irrigated with saline water (or grown on salt-affected soils), pepper growers must consider the salinity response function and seasonal productivity alongside an appropriate irrigation regime.Keywords: Capsicum annuum L.; class A pan-evaporation, modelling; sweet pepper varieties; salinity response function; salinity tolerance index, season; irrigation water productivity; yield. 2 IntroductionPepper (Capsicum annuum L.) is a high-value crop cultivated in many parts of the world (DeWitt and Bosland, 1993). In the Mediterranean basin, pepper crops are grown in greenhouses and often irrigated in salt-affect...

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“…In addition, leaching and runoff of N from fields is difficult to determine through field experiments; N that can be measured in groundwater and streams originates from different sources and cannot easily be attributed to an experimental field. An alternative approach avoiding these downsides is to use modelling (Chukalla et al, 2015;Ragab, 2015).…”

Section: Introductionmentioning

confidence: 99%

Grey water footprint reduction in irrigated crop production: effect of nitrogen application rate, nitrogen form, tillage practice and irrigation strategy

Chukalla

Krol

Hoekstra

2018

Hydrol. Earth Syst. Sci.

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Abstract. Grey water footprint (WF) reduction is essential given the increasing water pollution associated with food production and the limited assimilation capacity of fresh water. Fertilizer application can contribute significantly to the grey WF as a result of nutrient leaching to groundwater and runoff to streams. The objective of this study is to explore the effect of the nitrogen application rate (from 25 to 300 kg N ha −1 ), nitrogen form (inorganic N or manure N), tillage practice (conventional or no-tillage) and irrigation strategy (full or deficit irrigation) on the nitrogen load to groundwater and surface water, crop yield and the N-related grey water footprint of crop production by a systematic model-based assessment. As a case study, we consider irrigated maize grown in Spain on loam soil in a semi-arid environment, whereby we simulate the 20-year period 1993-2012. The water and nitrogen balances of the soil and plant growth at the field scale were simulated with the Agricultural Policy Environmental eXtender (APEX) model. As a reference management package, we assume the use of inorganic N (nitrate), conventional tillage and full irrigation. For this reference, the grey WF at a usual N application rate of 300 kg N ha −1 (with crop yield of 11.1 t ha −1 ) is 1100 m 3 t −1 , which can be reduced by 91 % towards 95 m 3 t −1 when the N application rate is reduced to 50 kg N ha −1 (with a yield of 3.7 t ha −1 ). The grey WF can be further reduced to 75 m 3 t −1 by shifting the management package to manure N and deficit irrigation (with crop yield of 3.5 t ha −1 ). Although water pollution can thus be reduced dramatically, this comes together with a great yield reduction, and a much lower water productivity (larger green plus blue WF) as well. The overall (green, blue and grey) WF per tonne is found to be minimal at an N application rate of 150 kg N ha −1 , with manure, no-tillage and deficit irrigation (with crop yield of 9.3 t ha −1 ). The paper shows that there is a trade-off between grey WF and crop yield, as well as a trade-off between reducing water pollution (grey WF) and water consumption (green and blue WF). Applying manure instead of inorganic N and deficit instead of full irrigation are measures that reduce both water pollution and water consumption with a 16 % loss in yield.

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Integrated Management Tool for Water, Crop, Soil and N‐Fertilizers: The Saltmed Model

Cited by 54 publications

References 32 publications

SALTMED Model as an Integrated Management Tool for Water, Crop, Soil and N‐Fertilizer Water Management Strategies and Productivity: Field and Simulation Study

SALTMED Model as an Integrated Management Tool for Water, Crop, Soil and N‐Fertilizer Water Management Strategies and Productivity: Field and Simulation Study

Effects of drip-irrigation regimes with saline water on pepper productivity and soil salinity under greenhouse conditions

Grey water footprint reduction in irrigated crop production: effect of nitrogen application rate, nitrogen form, tillage practice and irrigation strategy

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