California Agriculture, August 1978
Volume 32, Number 8
peer-reviewed research articles
A closer look at deficit high-frequency irrigation
by Elias Fereres, Bashir Amry, Jose Faci, Ali Kamgar, Delbert W. Henderson, Morethson Resende
Encouraging results with previous deficit high-frequency irrigation experiments raised hopes that the technique could reduce water use on some California crops. But studies with sorghum, beans, and tomatoes proved the method unsuccesstkl.In experiments with three different crops, DHFI resulted in substantial reductions in economic yields with no increase in water use efficiency.
Vine bleeding delays growth of T-budded grape Vines
by Curtis J. Alley, Albert T. Koyama
Slashing vines promotes early bud growth and results in greater growth of shoots and canes.
New weighing unit revolutionizes field research
by James T. Yeager, James J. Mehlschau
Portable field scale aids in gathering yield data from mechanically harvested crops utilizing bins.
Farm mechanization research: Assessing the consequences
by Refugio I. Rochin
Monies expended on mechanization research can gield significantly high net returns to society, despite evidence of large adjustment costs.Presents a partial response to accurately gauging the worth of mechanization research, offering a better understanding of the kinds of questions that must be answered to assess university research on farm mechanization.
Spider mite predator tested for pesticide resistance on pears
by Marjorie A. Hoy, Richard T. Roush
Under field conditions the spider mite predator M. occidentalis can resist low application rates of organophosphate pesticides; but the spider mite is 40 times more resistant to permethrin than its predator.Under lab conditions the spider mite predator, M. occidentalis, was found to be resistant to recommended concentrations of organophosphate compounds, but suffered high mortality rates when exposed to synthetic pyrethroids.
Tomato pomace scores well as sheep feed
by Norman H. Hinman, William N. Garrett, John R. Dunbar, Arthur K. Swenerton, Nancy E. East
A study with sheep shows tomato pomace has a feeding value for ruminants similar to good quality alfalfa when compared on a dry-matter basis.
Higher plant populations can increase cauliflower yields
by Robert K. Brendler
Cauliflower growers need high gields to justiftl high land costs. New spacing practices can increase gields bg as much as 50 percent.Increasing plant populations by 50 percent or more over the conventional planting of one row per bed calls for extra expense, special equipment, and inconvenience, but spacing experiments show costs are justified.
editorial, news, letters & science briefs
Proposition 13: The Aftermath
by J. B. Kendrick
Research in progress: Finnsheep increase lamb crop
by Gary Beall