A survey was conducted from April to June 2002 in 62 orchards of clementine mandarin grafted on Troyer or Carrizo citrange rootstock in Catalonia (northeastern Spain) to determine the relationship between physicochemical soil properties and Tylenchulus semipenetrans population densities. Soil was analyzed to determine texture, pH, electric conductivity, organic matter content, N, P, K, Mg, calcium carbonate, and calcium oxide. Also, trials were conducted in 2003 and 2004 in three drip-irrigated orchards of clementine mandarin cv. Clemenules (El Pla and Mariclaire) or cv. Hernandina (Martorella) to determine the relationship between citrus nematode densities and yield of mandarin. T. semipenetrans was detected in 77% of the surveyed orchards. The number of second-stage juveniles + males in soil was related to N and K soil content (3.57953 – 0.001305 N + 0.00113 K, R2 = 0.1620, P < 0.0157). The relationship between relative yield of clementine mandarin cv. Clemenules and densities of females per gram of root in spring was described by the Seinhorst damage function model (0.035 + 0.965 (0.9995)(Pi – 287), R2 = 0.4782, P < 0.0001).
Después de una minuciosa puesta a punto y calibración del banco se ha constatado precisiones en la medición y regulación de la presión de 0,1 kPa, manteniendo estables las rampas de subida y bajada de presión, con errores de caudal por debajo de 0,5%.Una novedad que introduce este banco frente a otros bancos automatizados es el diseño de un desviador de flujo que permite la estabilización en la pesada y precisión en la determinación de los caudales arrojados por los emisores.El control en la ejecución y puesta a punto del banco permite mucha versatilidad en los ensayos a realizar, así como flexibilidad y control en modificaciones futuras del mismo.
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