Calag Archive

Not available – first paragraph follows: Following a year of preliminary experiments, a long-term, field-scale foothill range fertilization study began in 1982 with a series of precise applications to 385 acres of foothill rangeland comprising 12 fields on Forbes Hill at the University of California Sierra Foothill Range Field Station, Browns Valley. Because deficiencies of three major elements — nitrogen, phosphorus, and sulfur — limit production on soils of the region, we established the study to compare nitrogen alone, phosphorus plus sulfur, and combinations of the three elements. Since results from these treatments could be expected to differ from each other over time (irrespective of level of nutrient applied) it was essential to initiate treatments simultaneously, so that comparisons could be made within the same weather years.

Not available – first paragraph follows: Drip irrigation is frequently cited as a technique that can drastically reduce the irrigation water requirements of the principal crops in California. Compared with sprinkler or furrow irrigation, the drip method can result in great water saving during the years trees or vines are becoming established (see article on drip irrigation of almond trees, California Agriculture, September-October 1982). However, the potential water saving brought about by drip-irrigating row crops is uncertain.

Not available – first paragraph follows: Six species of spider mites are associated with almond trees in California's Central Valley. The lack of economical and reliable sampling techniques has hampered not only research on these mites but also the grower's ability to estimate control status or population density in a minimum amount of time. Three of the six spider mite (tetrany-chid) species — the European red mite, brown almond mite, and citrus red mite — are occasionally abundant enough to require chemical treatment. European red mite and brown almond mite are most often found in the northern and central Valley, and the citrus red mite, in citrus-producing areas of the southeastern Valley.