California Agriculture Online
California Agriculture Home  >  Volume 31  >  Number 1

California Agriculture, January 1977

Volume 31, Number 1

research articles

Sorghum seeding rates for best yields
by George F. Worker
pp4, doi#10.3733/ca.v031n01p4
Abstract
Abstract Not Available – First paragraph follows: Maximum grain yields are attained only by uniform sorghum stands that allow uniform flowering and ripening. Inadequate stands resulting from low seeding or other causes produce secondary tillers from buds near the base of the plant; secondary tillers mature later than the main head, delaying harvest. Stands that are too heavy can result in lower yields, small kernels, and increased lodging.
Expanded Abstract | PDF

Asian pears in California
by William H. Griggs, Ben T. Iwakiri
pp8-12, doi#10.3733/ca.v031n01p8
Abstract
California now has only a few hundred acres of Asian pears in commercial orchards. Demand for these crisp, juicy pears has increased in recent years, and planting the best commercial varieties should result in further increases.
Expanded Abstract | PDF

Measuring nitrogen loss from denitrification
by Dennis E. Rolston
pp12-13, doi#10.3733/ca.v031n01p12
Abstract
Abstract Not Available – First paragraph follows: Denitrification is the biological reduction of nitrate and nitrite to volatile gases, usually nitrous oxide or molecular nitrogen, or both. Denitrification is accomplished by bacteria capable of using nitrate in place of oxygen. Under aerobic conditions the bacteria oxidize carbohydrates to carbon dioxide and water. In the absence of oxygen these bacteria oxidize carbohydrates in nitrate respiration, yielding carbon dioxide, water, and the volatile gases, nitrous oxide and molecular nitrogen.
Expanded Abstract | PDF

Protein to feed a hungry world
by Benjamin H. Beard, Milton D. Miller
pp14-16, doi#10.3733/ca.v031n01p14
Abstract
The basic cause of famines has been social mores and economically induced, unequal food distribution, according to speakers at a seminar series on protein.
Expanded Abstract | PDF

Search continues for control of almond hull rot
by L. Todd Browne, Joseph M. Ogawa, Bashier Gashaira
pp16-17, doi#10.3733/ca.v031n01p16
Abstract
Almond hull rot, caused by two genera of fungi, can result in severe dieback on vigorous, productive trees. Research is under way to find effective measures for controlling the disease.
Expanded Abstract | PDF

Laundering methods affect fabric wear
by Mary Ann Morris, Harriet H. Prato
pp18-19, doi#10.3733/ca.v031n01p18
Abstract
Abstract Not Available – First paragraph follows: As much as half of the wear on fabrics during use may occur in laundering. Consequently, it is important to control the laundry process so that good appearance and adequate soil removal are balanced with minimum abrasive damage. Abrasion may occur both in washing and in drying, and studies have shown that water quality, detergent type, and drying conditions are important variables affecting the amount of damage. Figure 1 shows varying amounts of abrasion that can occur along a fabric crease after repeated Iaunderings.
Expanded Abstract | PDF

Editorial, News, Letters and Science briefs

EDITORIAL: Let's open agriculture's black box
by J. B. Kendrick
pp2, doi#10.3733/ca.v031n01p2
PDF

Seed-coat color genes in six commercial varieties of beans
by Francis L. Smith
pp1-14, doi#10.3733/hilg.v31n01p001
Abstract
Colored beans have a dominant pigmentation gene, P, which acts with a number of seed-coat color genes to give a vast array of seed-coat colors. If p is present in the homozygous state, the beans are white regardless of the color genes. Lamprecht, a Swedish worker, had a white-seeded line which had P. This P-white, he assumed, was colorless because it had none of the dominant color genes. Seed of a P-white, Line 214, was obtained from Lamprecht and was used in crosses with mottled, self-colored, and white-seeded commercial varieties. The genotypes of the F2 color segregants in these crosses were determined by studying the F3 progenies from each color type from each cross. To account for the results obtained, it must be assumed that some of the P-white F3 segregants must have had Br and Rk (buff). Br has been found to be a brown modifier of Rk. Furthermore, the genetic effects of Rk were not shown unless the dominant color gene, G, was present. In a sense, then, both Rk and Br are modifier genes of G. The hypothesis that P-white beans carry no dominant color genes will have to be expanded to allow the presence of the dominant seed-coat modifier genes, Rk and Br. This study clarifies the genetic status of Rk, the existence of which was denied by Lamprecht.
PDF

Seed-coat color genes in six commercial varieties of beans
by Francis L. Smith
pp1-14, doi#10.3733/hilg.v31n01p001
Abstract
Colored beans have a dominant pigmentation gene, P, which acts with a number of seed-coat color genes to give a vast array of seed-coat colors. If p is present in the homozygous state, the beans are white regardless of the color genes. Lamprecht, a Swedish worker, had a white-seeded line which had P. This P-white, he assumed, was colorless because it had none of the dominant color genes. Seed of a P-white, Line 214, was obtained from Lamprecht and was used in crosses with mottled, self-colored, and white-seeded commercial varieties. The genotypes of the F2 color segregants in these crosses were determined by studying the F3 progenies from each color type from each cross. To account for the results obtained, it must be assumed that some of the P-white F3 segregants must have had Br and Rk (buff). Br has been found to be a brown modifier of Rk. Furthermore, the genetic effects of Rk were not shown unless the dominant color gene, G, was present. In a sense, then, both Rk and Br are modifier genes of G. The hypothesis that P-white beans carry no dominant color genes will have to be expanded to allow the presence of the dominant seed-coat modifier genes, Rk and Br. This study clarifies the genetic status of Rk, the existence of which was denied by Lamprecht.
PDF

General Information

The new look of 4-H
by Little Val, Thayer Horn
pp5, doi#10.3733/ca.v031n01p5
PDF