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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 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 ...
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...
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