California Agriculture, March 1958
Volume 12, Number 3
Nutrient solutions as tools of research
Citrus trees in water cultures: Information derived from studies using nutrient solutions as tools of research is of inestimable value to citrus industry
by H. D. Chapman, E. F. Wallihan, D. S. Rayner, Harrietann Joseph
Abstract Not Available – First paragraph follows: Certain types of basic information about soil-plant relations are indispensable for a sound basis for soil management. However, soils are an extremely complex body—consisting of almost endless numbers of chemical compounds and minerals, aqueous solutions, gas, and microorganisms—and are continuously changing.
Effect of nontillage of navels: Relation of some tillage practices to water infiltration, yield, and quality of oranges part of fertilizer experiment
by W. W. Jones, C. B. Cree, T. W. Embleton
Abstract Not Available – First paragraph follows: In the course of a long-term fertilizer experiment with Washington Navel oranges at Riverside, studies were made—during the period 1953-1957—on the relation of tillage and fertilizer treatments to the rate of water intake by the soil and to yield and fruit quality.
Splitting of Navel oranges: Studies indicate local temperature and humidity more closely related to incidence of injury than is soil moisture content
by O. C. Taylor, G. A. Cahoon, L. H. Stolxy
Abstract Not Available – First paragraph follows: Crop loss—of 20% or more—from the splitting of Navel oranges is no new problem. The trouble has plagued orange growers the world over and the general opinion seems to be that internal pressure develops within the fruit—probably as a result of extreme changes in moisture content associated with certain weather and soil moisture conditions—which ruptures the rind at the weakest point, the navel opening. Once started, the split usually expands rapidly dividing the fruit into two or more segments.
Albinism in citrus seedlings: Nongenetic absence or deficiency of chlorophyll in seedlings prevented by treating freshly extracted seeds with fungicide
by George F. Ryan
Part of the work described in the following progress report was conducted by Enrique Stein, Graduate Student in Subtropical Horticulture, University of California, Los Angeles, under the direction of Professor George F. Ryan.
Iron and zinc foliage sprays: Radioactive tracers being used in basic studies on factors influencing absorption and translocation of micronutrients
by A. Wallace, A. A. Bedri
Abstract Not Available – First paragraph follows: Sprays have been the most effective method—to date—of supplying the micronutrients iron and zinc to many crops. Although considerable research has been done in recent years on the use of metal chelates for soil application of these two nutrients, the use of such materials is recommended only for high-value plantings. Spray application is still indicated for most crops. For this reason basic studies are being conducted on factors influencing the absorption and the subsequent translocation of these two elements.
Chlorine absorption: All portions of citrus trees grown in soil cultures absorbed chlorine in test
by Joseph N. Brusca, A. R. C. Haas
Abstract Not Available – First paragraph follows: Citrus trees utilize very little or no chlorine in their nutrition processes. They do, however, tend to accumulate chlorine in certain tissues. When such accumulations become excessive, they may cause the tissue to burn as in leaf tips and margins. In addition, the leaf size may be reduced and a fading may take place in the chlorophyll or green coloring matter of the leaves.
Red mite on citrus: Timing control treatments important and influenced by climate of growing areas
by L. R. Jeppson
Abstract Not Available – First paragraph follows: Populations of red mite—spider—on citrus are influenced by temperature and humidity, local air movements and weather variations.
Grocery store credit service: Combinations of credit with telephone and delivery services are related to the locations, ownership and sizes of stores
by Marilyn Dunsing, Jessie V. Coles
Continuation of the third article in a series of reports of a survey of characteristics of and services offered by retail grocery stores in five counties in California made cooperatively by the Department of Home Economics, University of California, and the United States Department of Agriculture under the authority of the Research and Marketing Act as part of Western Regional Research Project WM-26.
Woolly and green apple aphids: Field trials with new materials in orchard near Watsonville indicate same timing of spray treatment controls both pests
by Harold F. Madsen, J. Blair Bailey
Abstract Not Available – First paragraph follows: Woolly apple aphid and green apple aphid are two of the more important pests of apple, especially in the coastal districts of northern California. Both are difficult to control because they are able to reinfest trees after spray applications.
Changes in orange marketing: Developing revolution in marketing and distribution of the nation's food products affects fresh and processed oranges
by Sidney Hoos