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Progressive Development And Seasonal Variations Of The Corn Crop, T. A. Kiesselbach

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

The chief purpose of these studies has been to determine the normal growth changes that occur in the corn plant at successive intervals when growing in the field, and to observe annual yield variations in relation to prevailing weather conditions. Aside from supplying information regarding the physiology of this crop, the data are of interest to the corn grower because they indicate comparative yields, shelling percentages, moisture contents, and feed constituents at various stages of development. Some data also are presented concerning the effects of frost, drouth, day length, and the economic value of tillers and seminal roots.

Aircraft In Agriculture, N. E. Shafer, J. D. Furrer, J. W. Lomax

Nebraska Agricultural Experiment Station: Historical Circulars

Airplanes were first used in agriculture shortly after the close of World War I. They proved valuable for locating mosquito breeding areas, for forest fire patrol work, as an aid in locating outlaw cotton fields in the campaign against pink bollworm, and for surveying damage caused in large forested areas by the spruce budworm.

The Growth-Promoting Properties Of Quinic Acid, Malcom Gordon, Francis A. Haskins, Herschel Mitchell

Department of Agronomy and Horticulture: Faculty Publications

Evidence is accumulating that there is a common metabolic precursor to many of the benzene ring derivatives found in living organisms. Recent work by Davis and Tatum indicates that one such precursor is the naturally occurring shikimic acid (Fig. 1) since this compound serves as a growth factor for certain mutants of Escherichia coli and Neurospora which otherwise require a combination of tyrosine, phenylalanine, tryptophan and p-aminobenzoic acid for growth. These mutants cannot utilize the closely related, naturally occurring quinic acid (Fig. 1) as a substitute for any of their requirements.

Stabilization Of Midwestern Grassland, J. E. Weaver

Department of Agronomy and Horticulture: Faculty Publications

Table of Contents:
Introduction
Introduction
Upland Communities Preceding And Following The Drought
Persistence And Effect Of Western Wheat Grass
Development Of Understory
Chief Invaders
Competition In Drought
Relative Penetration Of Water
Rate Of Infiltration
Relative Amounts Of Soil Moisture
7 Effects On Vegetation
Severity Of Competition In Drought
Persistence Of Effects After Drought
Effects On Forbs And Seedlings
Competition With Big Bluestem
Needle Grass Consociation
Prairie Dropseed Consociation
Indicators Of Delay In Recovery
Role Of Big Bluestem
Little Bluestem And The Return Of Its Type
Spreading Of Kentucky Bluegrass
Establishment Of Seedlings
New Soil Mulch And Return Of Understory
Return …

Effects Of Different Intensities Of Grazing On Depth And Quantity Of Roots Of Grasses, J. E. Weaver

Department of Agronomy and Horticulture: Faculty Publications

The writer has been interested in prairies, pastures, and root depth and distribution over a period of many years. He had the privilege of examining these relationships in the Palouse prairie of Washington long ago while numerous representative areas still remained in a virgin condition (5, 6). Extensive studies have been made in the hardlands of Colorado, Kansas, and Nebraska many years before, during, and following the great drought of 1933-40 (7, 8, 1, 11). Vegetation and root habits have been studied in sand hills (7, 8, 4), in bluffs of wind-blown loess (12), and wet soils of lowland. The …

Monolith Method Of Root-Sampling In Studies On Succession And Degeneration, J. E. Weaver, John Voigt

Department of Agronomy and Horticulture: Faculty Publications

A new method has been devised by which a complete sample of an entire root system may be taken from soil surface to maximum depth of penetration. The roots are separated from the soil without injury to them or displacement of individual roots from their natural position. They are examined in the laboratory in relation to the various horizons of the soil profile. Monoliths 12 inches wide, 3 inches thick, and 3-5 feet in depth are taken from the walls of trenches made in selected pure stands of each species. Roots are obtained from the monolith by a system of …

Microorganisms And Soil Structure, T. M. Mccalla

Department of Agronomy and Horticulture: Faculty Publications

SUMMARY

Laboratory tests were made to determine the effectiveness of different compounds and microbial groups in increasing the stability of Peorian loess lumps against the action of falling water drops. The influence of these on percolation tests in the laboratory was also determined.

Many organic substances-dextrose, sucrose, starch, peptone, cullulose, and gum arabic-did not themselves contribute directly to soil-structure stability, though these substances do furnish energy material for soil microorganisms, which can convert them readily into either microbial tissue or decomposition products that increase soil-structure stability. Lignin, proteins, oils, fats, waxes, resin, and paraffin increased the stability of lumps of …

How To Make It: Rabbit Trap Is Easy To Build

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The rabbit trap described in this leaflet has proved satisfactory and is easy to build. It consists of a box with a drop door, held up by a projecting wire, one end of which is attached to a false floor or treadle. The weight of the rabbit on the treadle beyond the fulcrum pulls back the wire and releases the door.

Manual Of The Grasses Of The United States, Second Edition, A. S. Hitchcock, Agnes Chase

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

By the late A. S. HITCHCOCK (died December 16, 1935), principal botanist, Division of Plant Exploration and Introduction; second edition revised by AGNES CHASE, formerly senior botanist and later collaborator, Division of Plant Exploration and Introduction, Bureau of Plant Industry, Soils, and Agnculturat Engineering, Agricultural Research Administration, and research associate, United States National Museum, Smithsonian Institution.

Of all the plants of the earth the grasses are of the greatest use to the human race. To the grasses belong the cereals, sugarcane, sorghum, and the bamboos; and, since they furnish the bulk of the forage for domestic animals, the grasses are …

Safflower Production In The Western Part Of The Northern Great Plains, C. E. Classen

Nebraska Agricultural Experiment Station: Historical Circulars

Recent development of new varieties with seeds averaging more than 30 per cent oil give safflower a good chance of becoming an important oil seed crop in the United States. It is the purpose of this circular to acquaint farmers with the crop and to outline the most promising production practices for those who undertake its production in the western part of the northern Great Plains.