Predicting soil moisture distribution, dry matter, water productivity and potato yield under a modified ‎gated pipe irrigation system: SALTMED model application using field experimental data

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This study investigated the suitability and benefits of using drainage water of fish farms (DWFF), instead of canal fresh water (IW), for wheat irrigation. Two water qualities, DWFF and IW, and four levels of N‐fertigation rates [100% N (192 kg N ha−1 season−1), 80% N, 60% N and 40% N] were tested. The results showed a positive impact when increasing N‐fertigation rate on the yield using both DWFF and IW. However, the yield under DWFF was higher than the yield under the IW treatment by between 11 and 51% in 2014 and between 8 and 38% in 2015. This is due to the additional amount of dissolved biological nitrogen and other nutrients inherent in DWFF. The SALTMED model simulated reasonably well the soil moisture and nitrogen content of all soil layers as well as wheat dry matter, yield and water productivity for all treatments, with R2 of 0.99, 0.97 and 0.96, respectively. It was concluded that the use of drainage water of fish farms instead of fresh water for irrigation of wheat could help to achieve higher yields while using less irrigation water and less chemical fertilizers. Additional benefits are less drainage to the drainage network and higher income for farmers. Copyright © 2017 John Wiley & Sons, Ltd.

“…() and El Shafie et al . () and proved its reliability and ability to predict the field‐measured yield, dry matter, soil moisture and salinity.…”

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 96%

The Benefit of Using Drainage Water of Fish Farms for Irrigation: Field and Modelling Study Using the SALTMED Model

Abdelraouf

Ragab

2017

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“…The SALTMED model was also able to simulated yield and biomass production of other crops, tomato (Abdel Gawad , et al , ), sugarcane (Golabi et al , ), chickpea (Silva et al , ), sweet corn (Hirich et al , ), sorghum (Ranjbar et al , ), amaranth (Pulvento et al , ), cucumber (Aly et al , ), sweet pepper (Rameshwaran et al , ) and potato (El‐Shafie et al , ).…”

Section: Discussionmentioning

confidence: 99%

“…Modelling results using the SALTMED model showed the capability of the model to predict yield and dry matter under saline and water stress conditions, with R 2 equal to 0.92 and 0.82 for yield and dry matter respectively. The SALTMED model was also able to simulated yield and biomass production of other crops, tomato (Abdel , sugarcane (Golabi et al, 2009), chickpea (Silva et al, 2012), sweet corn (Hirich et al, 2014b), sorghum (Ranjbar et al, 2015), amaranth (Pulvento et al, 2015), cucumber (Aly et al, 2015), sweet pepper (Rameshwaran et al, 2015) and potato (El-Shafie et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Yield and Dry Matter Simulation Using the Saltmed Model for Five Quinoa (Chenopodium Quinoa) Accessions Under Deficit Irrigation in South Morocco

Filali

Hirich

Benlhabib

et al. 2017

The frequent drought in the Mediterranean region requires better water and crop management. Selection of suitable drought‐tolerant crops and the application of water‐saving strategies are essential. For this reason, a drought‐tolerant crop, quinoa, was selected to test its suitability to be grown under Morocco's conditions. In 2012, five accessions of quinoa (Chenopodium quinoa Willd.) were studied in a field in Agadir, Morocco. Four irrigation levels were applied; the control treatment received 100% of the crop water requirement and three other treatments received 75, 50 and 25% of the crop water requirement. The SALTMED model was calibrated using yield and total dry matter data obtained from the control treatment for each accession. The accessions differed in plant height, growth stage duration, harvest date, harvest index, leaf area index and photosynthesis efficiency. The SALTMED model simulated the total dry matter and grain yield for the five quinoa accessions under the different deficit irrigation regimes with reasonable precision, as confirmed by the values of coefficient of determination, R2 of 0.96 and 0.92, respectively. The results indicate that deficit irrigation at 75% would only reduce the yield of accession L142 by 5%. Therefore, L142 was recommended to the growers in Morocco. Copyright © 2017 John Wiley & Sons, Ltd.

“…The model simulates the evapotranspiration, crop water uptake, soil temperature, soil salinity and soil moisture profiles, dry matter, yield, salinity and N‐leaching, soil N dynamics, groundwater level and its salinity, and drainage flow to open and tile drains. The model has been calibrated and validated with field data of drip irrigation on tomato and potato crops (Ragab et al ., , ), on sugar cane using sprinkler irrigation (Golabi et al ., ), on quinoa, sweetcorn and chickpea using drip irrigation (Hirich et al ., ), on vegetable crops (Montenegro et al ., ), on quinoa using saline water (Pulvento et al ., ), on amaranth using saline water (Pulvento et al ., ), on rainfed and irrigated chickpea (Silva et al ., ), on quinoa under deficit drip irrigation (Fghire et al ., ), on sweet pepper in greenhouses (Rameshwaran et al ., ) and on potato using gated pipes (El‐Shafie et al ., ). In all these studies the model proved its reliability and ability to predict the field measured yield, dry matter, soil moisture and salinity.…”

Section: Introductionmentioning

confidence: 97%

Effect of Fertigation Frequency and Duration on Yield and Water Productivity of Wheat: Field and Modelling Study Using the Saltmed Model

Abdelraouf

Ragab

2018

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This study investigated the impact of fertigation frequency and fertigation time on wheat production. The field experiment included nine treatments over two seasons, 2014/2015 and 2015/2016. The same amount of water and nitrogen fertilizer was given for all treatments, either over 1 day, divided over 2 days or over 3 days. Three fertigation times (FT, period of injecting fertilizers in irrigation water) as a fraction of the irrigation period were also applied. In FT strategies, nitrogen is given either during the same period of the irrigation from the start to the end, at the last three-quarters of the irrigation period or at the second half of the irrigation period, IT [FT = IT, FT = 0.75IT and FT = 0.5IT]. The observed and simulated nitrogen uptake and grain nitrogen content showed an increasing trend when fertigation frequencies increased and fertigation time decreased.The field and modelling results indicated that increasing fertigation frequencies and decreasing fertigation time have benefits particularly for sandy soils, including higher yields and less pollution. In conclusion, the use of the fertigation frequency of 3 days and fertilizer injection in the second half of the irrigation period is a good fertigation strategy for sandy soils. RÉSUMÉCette étude porte sur l'impact de la fréquence de fertigation et du temps de fertigation sur la production de blé. L'expérience de terrain a inclus neuf traitements pendant deux saisons, 2014/2015 et 2015/2016. La même quantité d'eau et d'engrais azoté a été donnée pour tous les traitements, répartis sur un, deux ou trois jours, Trois périodes de fertigation FT (période d'injection d'engrais dans l'eau d'irrigation) en tant que fraction de la période d'irrigation ont également été appliquées. Dans les stratégies FT, l'azote est donné soit pendant toute la période de l'irrigation, du début à la fin, soit au cours des trois derniers quarts de la période d'irrigation ou à la seconde moitié de la période d'irrigation, IT [FT = IT, FT = 0.75 IT et FT = 0.5IT]. L'absorption d'azote observée et simulée et la teneur en azote des grains ont montré une tendance croissante lorsque les fréquences de fertigation ont augmenté et que le temps de fertigation a diminué. Les résultats sur le terrain et la modélisation indiquent que l'augmentation des fréquences de fertigation et la diminution du temps de fertigation présentent des avantages, en particulier pour les sols sableux, avec des rendements plus élevés et moins de pollution. La période d'irrigation de trois jours et une fertigation appliquée pendant la deuxième moitié de la periode d'irrigation est une bonne stratégie de fertigation pour les sols sableux.