scholarly journals A Smart Irrigation Tool to Determine the Effects of ENSO on Water Requirements for Tomato Production in Mozambique

2018 ◽  
Author(s):  
Eduardo Gelcer ◽  
Clyde W. Fraisse ◽  
Lincoln Zotarelli ◽  
Daniel Perondi ◽  
Hipólito A. Malia ◽  
...  
Keyword(s):  
Water Demand ◽  
Crop Production ◽  
Southern Oscillation ◽  
Irrigation Management ◽  
Irrigation Scheduling ◽  
Water Requirements ◽  
Planting Dates ◽  
Tomato Crop ◽  
Tomato Production ◽  
The Right

Irrigation scheduling is used by growers to determine the right amount and timing of water application. In most parts of Mozambique, 90% of the total yearly precipitation occurs from November to March. The El Niño Southern Oscillation (ENSO) phenomenon influences the climate in Mozambique and affects the water demand for crop production. The objectives of this work were to quantify the effects of ENSO phenomenon on tomato crop water requirements, and to create the AgroClimate irrigation tool (http://mz.agroclimate.org/) to assist farmers in improving irrigation management. This study was based on daily grid-based climate information from 1983 to 2016 from the Climate Forecast System Reanalysis. Daily crop evapotranspiration was calculated by Hargreaves equation and crop coefficients. This tool is available online and considers different planting dates, ENSO phases, and crop growing season lengths. Irrigation needs varied from less than 250 mm per growing cycle during winter to 550 mm during spring. Both El Niño and La Niña influenced the irrigation scheduling, especially from November to March. El Niño periods were related with increased water demand due to drier and warmer conditions while the opposite was observed for La Niña. The ENSO information might be used to understand climate variability and improve tomato irrigation scheduling in Mozambique.

scholarly journals A Smart Irrigation Tool to Determine the Effects of ENSO on Water Requirements for Tomato Production in Mozambique

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1820 ◽  
Author(s):  
Eduardo Gelcer ◽  
Clyde Fraisse ◽  
Lincoln Zotarelli ◽  
Daniel Perondi ◽  
Hipólito Malia ◽  
...  
Keyword(s):  
El Niño ◽  
Water Demand ◽  
El Nino ◽  
Southern Oscillation ◽  
Irrigation Management ◽  
Irrigation Scheduling ◽  
La Niña ◽  
Water Requirements ◽  
Tomato Production ◽  
La Nina

Irrigation scheduling is used by growers to determine the right amount and timing of water application. In most parts of Mozambique, 90% of the total yearly precipitation occurs from November to March. The El Niño Southern Oscillation (ENSO) phenomenon influences the climate in Mozambique and affects the water demand for crop production. The objectives of this work were to quantify the effects of ENSO phenomenon on tomato crop water requirements, and to create the AgroClimate irrigation tool (http://mz.agroclimate.org/) to assist farmers in improving irrigation management. This study was based on daily grid-based climate information from 1983 to 2016 from the Climate Forecast System Reanalysis. Daily crop evapotranspiration was calculated by Hargreaves equation and crop coefficients. This tool is available online and considers different planting dates, ENSO phases, and crop growing season lengths. Irrigation needs varied from less than 250 mm per growing cycle during winter to 550 mm during spring. Both El Niño and La Niña influenced the irrigation scheduling, especially from November to March. El Niño periods were related to increased water demand due to drier and warmer conditions, while the opposite was observed for La Niña. The ENSO information might be used to understand climate variability and improve tomato irrigation scheduling in Mozambique.

scholarly journals Semi-Transparent Organic Photovoltaics Applied as Greenhouse Shade for Spring and Summer Tomato Production in Arid Climate

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1152
Author(s):  
Rebekah Waller ◽  
Murat Kacira ◽  
Esther Magadley ◽  
Meir Teitel ◽  
Ibrahim Yehia
Keyword(s):  
Solar Radiation ◽  
Organic Photovoltaics ◽  
Crop Production ◽  
Production Systems ◽  
High Light ◽  
Growth And Yield ◽  
Control Group ◽  
Tomato Crop ◽  
Tomato Production ◽  
Control Section

Recognizing the growing interest in the application of organic photovoltaics (OPVs) with greenhouse crop production systems, in this study we used flexible, roll-to-roll printed, semi-transparent OPV arrays as a roof shade for a greenhouse hydroponic tomato production system during a spring and summer production season in the arid southwestern U.S. The wavelength-selective OPV arrays were installed in a contiguous area on a section of the greenhouse roof, decreasing the transmittance of all solar radiation wavelengths and photosynthetically active radiation (PAR) wavelengths (400–700 nm) to the OPV-shaded area by approximately 40% and 37%, respectively. Microclimate conditions and tomato crop growth and yield parameters were measured in both the OPV-shaded (‘OPV’) and non-OPV-shaded (‘Control’) sections of the greenhouse. The OPV shade stabilized the canopy temperature during midday periods with the highest solar radiation intensities, performing the function of a conventional shading method. Although delayed fruit development and ripening in the OPV section resulted in lower total yields compared to the Control section (24.6 kg m−2 and 27.7 kg m−2, respectively), after the fourth (of 10 total) harvests, the average weekly yield, fruit number, and fruit mass were not significantly different between the treatment (OPV-shaded) and control group. Light use efficiency (LUE), defined as the ratio of total fruit yield to accumulated PAR received by the plant canopy, was nearly twice as high as the Control section, with 21.4 g of fruit per mole of PAR for plants in the OPV-covered section compared to 10.1 g in the Control section. Overall, this study demonstrated that the use of semi-transparent OPVs as a seasonal shade element for greenhouse production in a high-light region is feasible. However, a higher transmission of PAR and greater OPV device efficiency and durability could make OPV shades more economically viable, providing a desirable solution for co-located greenhouse crop production and renewable energy generation in hot and high-light intensity regions.

scholarly journals Tomato production in hydroponic system using different agrofilms as greenhouse cover

2020 ◽  
Vol 38 (1) ◽  
pp. 58-64
Author(s):  
Douglas José Marques ◽  
Edmur Matheus Filho ◽  
Hudson C Bianchini ◽  
Valdir Veroneze Junior ◽  
Breno Régis Santos ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Crop Production ◽  
Growth Habit ◽  
Soluble Solids ◽  
Tomato Crop ◽  
Indeterminate Growth ◽  
Tomato Production ◽  
Hydroponic System ◽  
Indeterminate Growth Habit ◽  
Lycopene Content

ABSTRACT Protected cultivation has increased over the years. More studies on the benefits of using photoselective agrofilms are necessary. The choice of material to cover the greenhouse is a decisive factor for crop development and production. The aim of this study was to evaluate the effect of diffuser and blue-colored agrofilms on the production of different tomato cultivars of indeterminate growth habit under NFT hydroponic system. A completely randomized design in a 2x3 factorial scheme (two environments and three cultivars) was used: two agrofilm types (blue and diffuser) and 3 cultivars (Monterrey, Arendell and Totalle). Each plot consisted of 30 plants per treatment, with four replicates. Commercial tomato seedlings of indeterminate growth habit grafted on rootstock cultivar (Shincheonggang) were used. During the experiment, the electrical conductivity, intensity of radiation inside the greenhouse, gas exchange, soluble solids, lycopene content, pH and fruit production were evaluated. We concluded that the amount of radiation transmitted through the diffuser favors an increase of about 18% in gas exchange, 12% in lycopene content and 9.4% in tomato crop production.

scholarly journals A Comparison of Overhead Irrigation Scheduling and Switch Tensiometers

HortScience ◽  
2000 ◽  
Vol 35 (4) ◽  
pp. 554A-554
Author(s):  
Edward Bush ◽  
Ann Gray ◽  
Virginia Thaxton ◽  
Paul Wilson
Keyword(s):  
Irrigation Management ◽  
Irrigation Treatment ◽  
Irrigation Scheduling ◽  
Harvest Date ◽  
Planting Dates ◽  
Woody Ornamentals ◽  
Harvest Dates ◽  
Overhead Irrigation ◽  
Low Tension ◽  
Irrigation Volume

Proper irrigation management is essential for producing quality container-grown woody ornamentals and reducing off-site runoff. Research has shown that tensiometers can be used as an effective tool to schedule irrigation for woody ornamentals. The objective of this experiment was to compare the effect of cyclic and tensiometric irrigation methods on growth of lantana. Lantana camara `New Gold' liners were established in a 3 pine bark: 1 peat:1 mason sand (by volume) medium. Low-tension switch tensiometers were compared to scheduled overhead [one time a day (1×) at 0600 and cyclic irrigation three times a day (3×) at 0600, 1200, and 1800] for the production of 1-gallon lantana plants. Three low-tension tensiometers (1/block) were set at 7 cb and allowed to irrigate over a 12-hour period. Three separate planting dates occurred and then terminated after ≈7 weeks. Tensiometric irrigation increased root and shoot growth compared to scheduled irrigation for the 24 May 1999 harvest date. Cyclic irrigation produced plants with shoot and total root weights >1× and tensiometer treatments for the September harvest date. Tensiometers sharply reduced irrigation requirements compared to scheduled irrigation volume by at least 50% of the 1× and 3× treatments weekly. Analysis of nutrients in leachate for June indicated increased B and Fe concentrations in the 3× irrigation treatment. Lower concentrations of Ca, Mg, and Na were measured in August. Lantana growth was acceptable for all irrigation treatments and harvest dates.

Environment impact of nitrogen losses from agriculture under different management practices

2020 ◽  
pp. 138-149
Author(s):  
Pooja LR ◽  
Renu Singh ◽  
Manoj Shrivastava ◽  
Ruma Das ◽  
Seema Sangwan ◽  
...  
Keyword(s):  
Crop Production ◽  
Management Practices ◽  
Negative Impact ◽  
Nutrient Use Efficiency ◽  
Irrigation Management ◽  
Nitrous Oxide Emissions ◽  
Environment Impact ◽  
Management Options ◽  
Human Welfare ◽  
The Right

Nitrogen (N) fertilization is playing a vital role in increasing crop production and ensuring food security. The global population which is growing exponentially has reached nearly 7.5 billion in 2015 (from 1.65 billion in 1900).The sole reason behind this is synthetic nitrogen fertilizer, it alone supported 3.5 billion people otherwise it would be somewhere around 3.5-4 billion. Imbalanced use of N fertilizer leads to N deficient condition which affects plants growth and development also in N surplus condition it has a huge negative impact on environment and human welfare. It includes negative effects on biodiversity, eutrophication, nitrate accumulation in waters, acidification of soil and water bodies, nitrous oxide emissions and risks to human health due to exposure to ozone and particulate matter. In agricultural systems, when fertilizer is applied to crop is mainly prone to losses through ammonia (NH3) volatilisation, nitrate (NO3-) leaching and denitrification. Loss of N in the form of NH3 and NO3- mainly depends on various factors like temperature, soil pH, soil moisture, soil properties, plant characteristics, seasonal fluctuations. An integrated approach is must to minimize N losses and increase crop yield. In broader sense, options to minimize NH3 volatilization and NO3 leaching are fertilizer, soil and irrigation based management strategies. Fertilizer management options like 4R nutrient stewardship concept applying the Right Source of nutrients, at the Right Rate, at the Right Time and in the Right Place. Managing soil by practicing conservational tillage with crop based scheduled irrigation. This small change in nutrient, soil and irrigation management find way to make improvements in the nutrient use efficiency, profitability in farming, environmental safety and sustainable ecosystem with fertilizers in the developing world.

scholarly journals Modelling water requirements of greenhouse spinach for irrigation management purposes

2016 ◽  
Vol 48 (3) ◽  
pp. 776-788 ◽  
Author(s):  
Andrea Bianchi ◽  
Daniele Masseroni ◽  
Arianna Facchi
Keyword(s):  
Irrigation Management ◽  
Model Performance ◽  
Crop Coefficient ◽  
Field Capacity ◽  
Irrigation Scheduling ◽  
Balance Model ◽  
Water Requirements ◽  
Greenhouse Crops ◽  
Using Data ◽  
Nitrogen Treatments

Estimating water requirements of plants cultivated in greenhouse environments is crucial, both for the design of greenhouse irrigation systems and the improvement of irrigation scheduling. Spinach is one of the main vegetables sold as ‘ready-to-eat’ bagged produce; it is very sensitive to water stress and thus requires accurate irrigation. In this work, a water balance model simulating the daily irrigation need for greenhouse crops based on the FAO-56 ‘single crop coefficient’ method was designed and applied (FAO-56-GH). Two experiments were conducted on two spinach varieties grown in pots in different periods. For each experiment, four nitrogen treatments were considered. Irrigation was managed weighing the pots every day, and restoring soil water to field capacity. Crop coefficient (Kc) values were calibrated using data of the first experiment, the model was successively validated using the second dataset. Results showed a good model performance both in the validation and calibration periods (R2 = 0.80 and 0.84, root mean square error (RMSE) = 0.41 and 0.21 mm day−1, Nash–Sutcliffe efficiency (NSE) = 0.78 and 0.83). Analysis of variance (ANOVA) test revealed a scarce dependence of irrigation needs to nitrogen treatments. This study suggests the possibility of adopting the FAO-56-GH model with site-specific Kc to improve irrigation management and planning in greenhouse environments.

scholarly journals Irrigation Scheduling As a Means of Applying the Right Water Amount and Monitoring Soil Moisture for Vegetable Crops Grown in Florida in the BMP Era

EDIS ◽  
1969 ◽  
Vol 2003 (4) ◽  
Author(s):  
Eric Simonne ◽  
George Hochmuth
Keyword(s):  
Production Management ◽  
Irrigation Management ◽  
Irrigation Scheduling ◽  
Cooperative Extension Service ◽  
Publication Date ◽  
Vegetable Production ◽  
Vegetable Crops ◽  
Irrigation Amount ◽  
University Of Florida ◽  
The Right

This publication is one of a series entitled Fertilizer and Irrigation Management in the BMP Era. This series is divided into nine principles described in the Introduction Chapter (HOS-897). This publication is part of Principle 5, "Irrigation Amount Must Reflect Crop Water Use ... No More, No Less." BMP implementation requires a global approach to production management. However, for presentation purposes, each aspect of vegetable production is described in a separate publication. This document is HS909, one of a series of the Horticultural Sciences Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Publication date: January 2003. https://edis.ifas.ufl.edu/hs166

scholarly journals Evaluation of crop water demand for sustainable crop production using geospatial tools in a canal command of West Bengal

2021 ◽  
Vol 21 (4) ◽  
pp. 427-433
Author(s):  
Laishram Kanta Singh ◽  
Madan K. Jha ◽  
V.M. Chowdary ◽  
Srikanta Sannigrahi
Keyword(s):  
Water Resources ◽  
Water Demand ◽  
Crop Production ◽  
Vegetation Index ◽  
Agricultural Sector ◽  
Reference Evapotranspiration ◽  
Irrigation Management ◽  
Crop Water ◽  
Crop Water Demand ◽  
Canal Command

The agricultural sector is the primary consumer of water resources around the world, and the need for additional food production for growing population further exerts more pressure on water resources. In this study, crop water demand was assessed spatially and temporally for a case study area, Damodar Canal Command (DCC) using geospatial techniques. Crop evapotranspiration was estimated for all the crop seasons using reference evapotranspiration and Fraction of Vegetation cover (FV) that was used as a surrogate for crop coefficient. The reference evapotranspiration (ET ) was calculated using the FAO o Penman-Monteith method. FV was computed based on Normalized Difference Vegetation Index (NDVI) derived from MODIS satellite imagery and its value ranges from 0 to 1. The maximum and minimum reference evapotranspiration values were estimated as 8.44 and 1.88 mmday-1 in May and September, respectively during the normal year 2004. The average monthly crop water demand was maximum in May i.e. 8.08 mmday-1. Among all crop seasons, Boro season has the maximum crop water demand followed by Aus and Aman seasons with maximum ET as 496, 438 and 328 mm, respectively. Total annual crop c water demand for normal year, 2004 was estimated at 1237 mmyr-1 in the study area. Spatially and temporally distributed crop water demand estimates help the irrigation planners to devise the strategies for effective irrigation management.

Automatic Irrigation Control System for Soilless Culture Based on Feedback from Drainage Hydrograph

2017 ◽  
Vol 33 (4) ◽  
pp. 531-542 ◽  
Author(s):  
Daniel Rodríguez ◽  
Juan Reca ◽  
Juan Martínez ◽  
Miguel Urrestarazu
Keyword(s):  
Control System ◽  
Low Cost ◽  
Irrigation Management ◽  
Irrigation Scheduling ◽  
Soilless Culture ◽  
Proportional Integral Derivative ◽  
Tomato Crop ◽  
Proportional Integral ◽  
Irrigation Application ◽  
Irrigation Control

Abstract. In a soilless culture, water and nutrients must be frequently and precisely applied due to the reduced volume and low water holding capacity of the substrate. We describe a low-cost and efficient control system for the irrigation management of soilless culture based on an irrigation tray. Both irrigation and drainage volumes from the irrigation control tray are measured automatically. The proposed irrigation scheduling options were based on applying both variable timing and amounts. A Proportional Integral Derivative (PID) algorithm was used to establish the irrigation timing option while two different irrigation application options, based on measurements from the drainage hydrograph, were developed and tested. A field test performed on a tomato crop was carried out to assess the performance of the two irrigation application options. Both irrigation algorithms performed well as they fitted the leaching fraction for every irrigation event to the target value. The fruit yield and quality were comparable to results obtained from the control treatment of the tomato crop. The designed low-cost irrigation control system, if implemented on commercial farms, could prove to be economically very beneficial. Keywords: Automation, Drainage hydrograph, Irrigation control tray, Irrigation scheduling, Proportional-Integral-Derivative (PID) controller, Substrate culture.

scholarly journals Using High-Spatiotemporal Thermal Satellite ET Retrievals for Operational Water Use and Stress Monitoring in a California Vineyard

2019 ◽  
Vol 11 (18) ◽  
pp. 2124 ◽  
Author(s):  
Knipper ◽  
Kustas ◽  
Anderson ◽  
Alsina ◽  
Hain ◽  
...  
Keyword(s):  
Data Fusion ◽  
Water Use ◽  
Deficit Irrigation ◽  
Irrigation Management ◽  
Growing Season ◽  
Irrigation Scheduling ◽  
Data Availability ◽  
Sensor Data ◽  
Water Requirements ◽  
Fusion Approach

In viticulture, deficit irrigation strategies are often implemented to control vine canopy growth and to impose stress at critical stages of vine growth to improve wine grape quality. To support deficit irrigation scheduling, remote sensing technologies can be employed in the mapping of evapotranspiration (ET) at the field to sub-field scales, quantifying time-varying vineyard water requirements and actual water use. In the current study, we investigate the utility of ET maps derived from thermal infrared satellite imagery over a vineyard in the Central Valley of California equipped with a variable rate drip irrigation (VRDI) system which enables differential water applications at the 30 × 30 m scale. To support irrigation management at that scale, we utilized a thermal-based multi-sensor data fusion approach to generate weekly total actual ET (ETa) estimates at 30 m spatial resolution, coinciding with the resolution of the Landsat reflectance bands. Crop water requirements (ETc) were defined with a vegetative index (VI)-based approach. To test capacity to capture stress signals, the vineyard was sub-divided into four blocks with different irrigation management strategies and goals, inducing varying degrees of stress during the growing season. Results indicate derived weekly total ET from the thermal-based data fusion approach match well with observations. The thermal-based method was also able to capture the spatial heterogeneity in ET over the vineyard due to a water stress event imposed on two of the four vineyard blocks. This transient stress event was not reflected in the VI-based ETc estimate, highlighting the value of thermal band imaging. While the data fusion system provided valuable information, latency in current satellite data availability, particularly from Landsat, impacts operational applications over the course of a growing season.

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