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Esta guía esta orientada para personal de extensión que pueda encontrar preguntas de los productores acerca del funcionamiento y precisión de sensores de humedad del suelo (SMSs) para producción de arboles frutales. La información en este documento permitirá a los especialistas de extensión responder algunas preguntas generales acerca de los SMSs. Esta publicación se enfoca en dos tipos de sensores portátiles usados actualmente en Florida para manejo de irrigación en cítricos y otros arboles: El oscilador de línea de transmisión (TLO) y el transmisometro en el dominio del tiempo (TDT) por sus siglas en ingles. Para detalles acerca de SMSs no descritos en esta publicación o alguna marca de SMS en particular, personal de extensión puede consultar los autores o un especialista de irrigación local.

Identification of optimal microphone configurations and instrumentation is underway as a continuous process improvement effort at ATK Space Systems, where large solid rocket motors (SRMs) have been tested for decades. Rocket motor tests provide a unique environment which cannot be fully duplicated in a laboratory. This is especially true for the largest SRM ever to be tested, Demonstration Motor I (DM-I), which is the five-segment first stage of the NASA Constellation program’s Ares I launch vehicle. During the DM-I firing, two separate arrays of pressure transducers with various vent tube configurations, microphones, accelerometers, and temperature sensors were placed at locations near the motor. The objectives were to better determine the vibration levels and temperature to which acoustic gages are subjected and to examine their comparative performance for different vent tube configurations, particularly at low frequencies (10–30 Hz). Results from the DM-I and corroborating laboratory tests reveal very different low-frequency responses for the pressure transducers that depend critically on vent tube configuration. This and other issues are discussed.

This guide is for Extension personnel who may encounter questions from growers about the functioning and accuracy of soil moisture sensors (SMSs) for fruit tree production. The 4-page publication focuses on two types of handheld sensors currently used in Florida for irrigation management of citrus and other trees: the transmission line oscillator (TLO) and time-domain transmissometer (TDT). Written by Eric Herrera, Sandra M. Guzmán, and Eduart Murcia, and published by the UF/IFAS Department of Agricultural and Biological Engineering, February 2021.