10 documents found, page 1 of 1
Fertigation with nitrogen and other nutrients in northern highbush blueberry
Bryla, David; Machado, Rui; Leon-Chang, D.P.; Orr, S:T.Abstract Most highbush blueberry (Vaccinium sp.) fields are irrigated by drip. A major advantage of drip is the ability to fertigate and apply fertilizers directly through the irrigation water. A series of studies were conducted in western Oregon, USA to identify the best practices for applying N and other nutrients by fertigation. Fertigation with various fluid NH4-N sources, including ammonium sulphate, urea,...
Strategies to reduce supraoptimal temperatures in the root zone during field an...
Machado, Rui; Bryla, David; Correia, ManuelAbstract The roots of highbush blueberry (Vaccinium sp.) are sensitive to high temperatures and tend to grow poorly in warm soils or warm soilless media. Three experiments were conducted to evaluate strategies for reducing temperatures in the root zone in Évora, Portugal, where soil can reach temperatures >45°C. The first experiment was conducted in a small planting of ‘Ozarkblue’ blueberry. Treatments included...
Strategies to reduce supra-optimal temperatures during field and containerized ...
Machado, Rui; Bryla, David; Correia, ManuelaThe roots of highbush blueberry are sensitive to high temperatures and tend to grow poorly in warm soils or warm soilless media. Three experiments were conducted to evaluate strategies for reducing temperatures in the root zone in Évora, Portugal, where soil can reach temperatures > 45 °C. The first experiment was conducted in a small planting of ‘Ozarkblue’ blueberry. Treatments included bare soil, a 10-cm-dee...
Chemigation with Micronized Sulfur Rapidly Reduces Soil pH in a New Planting of...
Almutairi, Khalid; Machado, Rui; Bryla, David; Strik, BernadineNorthern highbush blueberry (Vaccinium corymbosum L.) is adapted to acidic soil conditions and often grows poorly when soil pH is greater than 5.5. When soil pH is high, growers will usually mix prilled elemental sulfur (So) into the soil before planting (converted to sulfuric acid by soil bacteria) and, if needed, inject acid into the irrigation water after planting. These practices are effective but often exp...
Effects of substrate type on plant growth and nitrogen and nitrate concentratio...
Barcelos, Carina; Machado, Rui; Ferreira, Isabel Alves; Ferreia, Rui; Bryla, DavidAbstract The effects of three commercial substrates (a mixture of forest residues, composted grape husks, and white peat, black peat and coir) on plant growth and nitrogen (N) and nitrate (NO3) concentration and content were evaluated in spinach (Spinacia oleracea L. cv. Tapir). Spinach seedlings were transplanted at 45 days after emergence into Styrofoam boxes filled with the substrates and were grown during w...
Nitrogen requirements at bulb initiation for production of intermediate-day onions
Machado, Rui; Bryla, DavidNitrogen requirements at bulb initiation for production of intermediate-day onions Article in Acta horticulturae · October 2016 DOI: 10.17660/ActaHortic.2016.1142.11 1st Rui Machado 16.44 · Universidade de Évora 2nd David R. Bryla 30.16 · United States Department of Agriculture Abstract Nitrogen requirements at bulb initiation for production of intermediate-day onions Authors: R.M.A. Machado, D.R. Bryla Keyword...
Effects of Salinity Induced by Ammonium Sulfate Fertilizer on Root and Shoot Gr...
Machado, Rui; Bryla, David; Vargas, OscarAbstract Ammonium sulfate fertilizer is commonly used in highbush blueberry (Vaccinium corymbosum L.) but often causes salt damage, particularly in young plants, when high rates are applied. Three experiments were done to determine the sensitivity of ‘Bluecrop’ blueberry to ammonium sulfate and identify the salinity threshold at which plant growth was affected. In the first experiment, plants were grown in pots...
Fertigation with micronized Sulfur rapidly reduces soil pH
Almutairi, Khalid; Bryla, David; Machado, RuiBlueberry is adapted to low soil pH in the range of 4-5.5. At higher pH, soil is often modified with elemental sulfur (S) prior to planting. A 2-year study was conducted to determine the potential of applying micronized wettable S by fertigation through the drip system to reduce soil pH in highbush blueberry. The field was planted in October 2010. The S was mixed with water and injected weekly for 2 months prio...
Nitrogen Fertigation is Less Efficient but Safer than Granular Fertilizer Appli...
Bryla, David; Machado, ruiNitrogen fertilizer methods and rates were evaluated in a new field of highbush blueberry (Vaccinium corymbosum L. `Bluecrop"). Treatments included four application methods (split fertigation, continuous fertigation, and two non-fertigated controls) and four rates of N application (0, 50, 100, and 150 kg/ha of N). Fertigation treatments were irrigated by drip and injected with dissolved ammonium sulfate fertili...
Nitrogen requirements for growth and early fruit development of drip-irrigated ...
Machado, Rui; Bryla, David; Oliveira, MariaNitrogen requirements for growth and early fruit development of drip-irrigated processing tomato (Lycopersicon esculentum Mill.) in Portugal Rui M.A. Machado 1*, David R. Bryla 2, M.L. Veríssimo 1, A.M. Sena 1 and M.R.G. Oliveira 1 1Universidade de Évora, Instituto de Ciências Agrárias Mediterrânicas (ICAM), Apartado 94, 7002-554, Évora, Portugal. 2United States Department of Agriculture, Agricultural Research ...