Test PB Collection: FTE

Analysis Terminology - 2003 Avocado in a Drought - 2002 Chemigation - 1997 Calcium Carbonate Clogging of Irrigation Emitters - 1997 ET to you - 1996 One hundred thousand - 1999 Predicting Water Requirements - 2002 Portable Soil Moisture Meters - 1993 Saline Waters - A Growing Problem - 2002 Winter I...

The oldest analysis terminology is weight per weight; e.g. 55 weights of calcium per weight of soil, standardized on a million weight of soil, tissue or water or parts per million (ppm).

The talk of drought and water restrictions in the State has created a time for serious decisions.

Low-flow irrigation systems are well suited to the injection of fertilizers and other materials because of the good water control allowed.

A crucial aspect to microsprinkler and dropper performance is maintaining the size of the orifice as it was delivered from the factory. Even small changes in the size of the orifice can have significant effects on the volume of water distributed in the orchard.

The use and misuse of the term ET (evapotranspiration) has become pronounced with the current water shortage and a brief review of the term seems timely. In short, ET is the amount of energy arriving at a site that drives water loss.

This little mnemonic, or memory aid, in the title is helpful in remembering the critical levels of toxic constituents in irrigation water.

Determining the water requirements of plants falls into three broad categories of technology - plant-based, soil-based and weather-based. Many of these technologies are proven and have been in use for years. Others are more experimental and have not been tested fully.

There are many ways of measuring soil moisture status - neutron probe, tensiometers, electrical resistance blocks, etc. - all of which have some limitations.

Despite the rains we have had this year, irrigated agriculture must always contend with salts. All waters, even rain water, have some salts dissolved in them, so all could be called saline. The term saline is restricted to waters with concentrations that could cause harm to plants or people.