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G83-684 Row Crop Planters: Equipment Adjustments And Performance In Conservation Tillage, Elbert C. Dickey, Paul J. Jasa

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide discusses planters used in conservation tillage systems and gives recommendations for improving planter performance.

The planter's primary job is to place seed where it will germinate and grow. Proper seed spacing minimizes competition for the light, nutrients and soil moisture essential for crop growth.

Several factors influence planter performance, including adjustments and correct operation. Field conditions also are important.

Traditionally, producers used tillage equipment that created a well-tilled, residue-free seedbed for planting. Many producers now are adopting conservation tillage methods that have fewer tillage operations and leave a protective residue cover on the soil surface.

Summary Of Experimental Results 1982/83., J. Hamblin

Experimental Summaries - Plant Research

82C22, 82C23 Wheat Production Trials, 82C24 Nitrogen flows from different legume species and varieties, 82C10 Lupins under sown with Harbinger, 82Cl9 The effect of Simazine on Harbinger Medic, 82C21 Pea variety trial, 82C23 The effect of green manuring on wheat yields.

Long Term Minimum Tillage Investigations. Stubble Management Techniques. Deep Ripping., R J. Jarvis

Experimental Summaries - Plant Research

Long term minimum tillage Investigations (i) Continuous cropping (page 4) – 77A16, 77E18, 77M13, 78M25, 77MT15, 77WH17, 78BA42. (ii) Rotational sites (page 15) – 77A43, 77E52, 77M56, 77MT51, 77WH88, 82M35. Stubble management techniques (page 23) – 79M7, 79WH6, 82LG4, 82M34. Deep ripping (page 27) - 77WH17, 80A44, 80NO46, 81LG3, 81M45, 81M53, 81NO3 & 4, 82GE37 & 38, 82GE38, 82M61, 82M25, 82M31, 82M32, 82M46, 82M60, 82N32, 82NO48 & 49, 82NO50 & 51, 82WH49, 83JE26, 83NO69. Direct drilling – continuous cropping – 83NA37 (a), 83NA37 (b), 83NA38. Deep ripping (or “deep loosening”) – 79MO19, 83TS41, 83TS42.

Plant Viruses, G D. Mclean

Experimental Summaries - Plant Research

1. Alfalfa mosaic virus: incidence in white clover. McLean, G.D., Weir, J.A., Russell, W.K., Speijers, E.J. and Price, L.K. - 83HA30, 83HA31, 83HA32, 83HA33, 83HA34, 83HA35, 83HA36, 83HA37, 83HA38, 83HA39. 2. Alfalfa mosaic virus: re-infection in white clover. McLean, G.D., Weir, J.A., Russell, W.K., Price, L.K. and Speijers, E.J. – 83HA43, 43HA44, 43HA45, 43HA46, 83HA47, 83HA48, 83HA49, 83HA50, 83HA51, 83HA52. 3. Lettuce necrotic yellows virus: incidence. McLean, G.D., Phillips, D.R., Speijers, E.J. Sandow, J.S. and Price, L.K. – 83PE21, 83PE22, 83PE23, 83PE24, 83PE25, 83PE26, 83PE27, 83PE28, 83PE29, 83PE30.

Aspen Management Guidelines For The Grand Mesa, Uncompahgre And Gunnison National Forest, Aspen Management Task Force

Aspen Bibliography

A task force was formed in late April 1983 for the purpose of developing guidelines for Aspen Management on the Grand Mesa, Uncompahgre and Gunnison National Forests.

Mensural Discrimination Of The Skulls Of Arkansas Peromyscus, V. Rick Mcdaniel, C. Renn Tumlison, Phil Mclarty

Journal of the Arkansas Academy of Science

Twelve parameters were measured on skulls of four species of Peromyscus from Arkansas. Univariate statistical tests, multivariate analyses of variance, and principal axis factor analyses were performed on the data set and/or subsets in a search for species-level discriminating characters. Total length of skull was found to discriminate between skulls of P. maniculatis, P. leucopus, and a combined group of P. attwateri and P. gossypinus. Furthermore, the ratio of interorbital width and length of nasal bone was found to adequately discriminate between skulls of P. attwateri and P. gossypinus.

Relationship Between Physical Conditioning And Plasma High Density Lipoprotein-Cholesterol Concentration, Leland F. Morgans, Dennis A. Baeyens, Manford D. Morris

Journal of the Arkansas Academy of Science

Five subjects (three females and two males) took part in an exercise regimen in order to determine if aerobic exercise results in an increase in high-density lipoprotein-cholesterol levels (HDL-C) in the plasma. The exercise regimen consisted of running three miles a day, five days per week for six months. Running speed was at such a pace that the subjects attained a minimum of 60% of their maximal heart rate reserve (MHRR). Before the training program began the following parameters were measured in all of the subjects: height, weight, percent body fat, maximal oxygen consumption (Vₒ₂ max), vital capacity, resting heart …

Spiders Collected From Abandoned Mine Tunnels In The Ouachita National Forest, Peggy Rae Dorris, David A. Saugey

Journal of the Arkansas Academy of Science

No abstract provided.

Neutral Sugars In Selected Pit Viper, Elapid, Lizard And Scorpion Venoms, Ahmed El-Sherif, Paul D. Gwinup, Bob D. Johnson, Dewey H. Sifford

Journal of the Arkansas Academy of Science

No abstract provided.

Status Of The Bat Myotis Keenii In The Arkansas Ozarks, Michael J. Harvey, V. Rick Mcdaniel

Journal of the Arkansas Academy of Science

No abstract provided.

Neviusia Alabamensis: A Phytogeographic Analysis, Alice A. Long

Journal of the Arkansas Academy of Science

No abstract provided.

A Nutritional And Morphological Study Of Two Cyanobacteria Free Azolla Ferns, Michael Paul Bonner

Theses and Dissertations

The symbiotic association between the aquatic water fern Azolla and its symbiont, Anabaena azollae Straus. has been extensively studied in the past ten years. The cyanobacteria has received much of the attention due to its ability to fix atmospheric nitrogen while the fern free of the cyanobiont has been somewhat neglected. The purpose of this research was to determine the nutritional requirements of the cyanobacteria free (CBF) ferns and study the morphology of the leaves and branches of these CBF ferns.

Azolla filiculoides and Azolla pinnata were freed of the cyanobiont using the surface sterilization technique adopted from Duckett, et …

Digestibility Of Sunflower Hulls Treated With Sodium, Ammonium, And Potassium Hydroxides, Bal Krishna Sharma

Electronic Theses and Dissertations

In vitro dry matter digestibility (IVDMD) of sunflower hulls (SFH) treated with sodium hydroxide (NaOH), ammonium hydroxide (NH₄OH), and potassium hydroxide (KOH) at increasing levels were studied. Tested concentrations of each alkali as percent dry matter (DM) on SFH were 1.63, 2.45, 3.26, and 4. 08. In vitro dry matter digestibility of sunflower hulls increased with higher concentrations of NaOH and KOH. Percent IVDMD for control (un-treated SFH) was 18.0. Percent IVDMD for SFH treated at 1.63, 2.45, 3.26, and 4.08% of DM were: 18.9, 21.4, 22.2, and 22.9 for NaOH; 18.3, 18.0, 18.3, and 18.5 for NH …

An Examination Of Prostaglandins As Causative Agents In Pine Needle (Pinus Ponderosa) Abortion, Daniel P. Shue

Electronic Theses and Dissertations

Cow and calf losses due to pine needle abortion in cattle grazing foothill ranges of ponderosa pine (Pinus ponderosa) continue to cause managerial and economic problems for ranchers in South Dakota, Colorado, Idaho, California, Montana and many areas throughout Canada. Because of its overall economic significance, investigators have been attempting to isolate and characterize causative agents of pine needle abortion. To date, a large number of pine needle constituents have been shown to possess abortifacient capabilities. In addition to actual pine needles, it appears that several other undefined factors may be associated with, and (or) predispose animals to, pine needle …

Effects And Interactions Of Nitrogen And Soil Moisture Status Under A High Yield Irrigated Corn Environment, Dwayne L. Beck

Electronic Theses and Dissertations

A two-part study was conducted during the 1979 and 1980 growing seasons on irrigated lands adjoining the Missouri River in central South Dakota. Empirical [sic] models were developed to describe the response of irrigated corn (Zea mays L.) to soil water status and nitrogen fertilization at a location recently developed for sprinkler irrigation. Nitrogen fertilizer rates of 0, 100, 200, and 400 kg of N/ha were used under water treatments consisting of a 2.5 cm irrigation when soil water matric potential at a depth of 40 cm decreased to -35, -50, and -75 kPa. Yield differences due to soil water …

Spawning The Grass Carp Female X Bighead Carp Male, Mike Freeze, Scott Henderson

Journal of the Arkansas Academy of Science

Methods and procedures for artificially spawning the female grass carp (Ctenopharyngodon idella) X male bighead carp (Aristichthys nobilis) are presented. Broodstock selection and treatment, hormone injections, ovulation, fertilization, hatching techniques and stocking rates are discussed. This paper outlines the procedures necessary to successfully produce hybrid grass carp

The Relationship Between Whole Brain Catecholamine Depletion In Carassius Auratus And The Exposure To Inescapable Shock In A Learned Helplessness Paradigm, Roderick J. Misunis

Masters Theses

Learned helplessness is a psychological concept that describes the subsequent escape-avoidance behavior of experimental subjects who are exposed to uncontrollable stressors. Subjects after treatment are unable to respond in situations where escape is possible. Two major theorists, Seligman and Weiss, have proposed explanations concerning the phenomena. Seligman feels that the subject is unable to respond due to the fact that the exposure to an uncontrollable stressor has caused him to learn to be "helpless". Weiss feels that the inability to respond can best be described by alterations in the subject's brain neurochemistry, specifically the neurotransmitter norepinephrine. This paper is an …

The Effect Of Repeated Spermiation On Sperm Density In The American Toad (Bufo Americanus), Michael A. Kriz

Masters Theses

Bufo americanus (American toad) responds to LH-RF injections by releasing sperm into the cloaca. An ANOVA test (repeated measures) was used to determine that spermiation number and body size but not frequency of injection affected sperm density. The affects of body size on sperm density were that large toads produced the highest sperm densities, followed by the medium and then the small toads. Sperm density decreased with repeated spermiations which could correlate with the explosive breeding pattern of the American toad.

Factors Influencing Reforestation Of Surface Mined Lands In Southern Illinois, Jill R. Medland

Masters Theses

Studies of surface coal mined lands have focused primarily on older lands mined prior to the enactment of reclamation legislation. Current laws will require extensive grading, soil replacement and revegetation. In order to more effectively reforest these lands, I have evaluated sites planted to woody species during the past decade.

The vegetational characteristics, as well as both avaian and small mammal populations of several reclaimed surface mined areas, differing in age and reclamation procedures, were compared. Success of planted trees ranged from 50 to 91% and survival varied with the species planted. There was no relationship between tree survival and …

Some Effects Of Simulated Acid Rain On Cool Season Turfgrasses, Robert C. Morrow

Masters Theses

Six varieties of cool season turfgrasses were exposed to simulated acid rainfall with treatments consisting of a sulfuric acid solution, a nitric acid solution, and a 50-50 mixture of both. Each solution was used to make "acid rain" of pHs 3.0, 2.5, 2.0, and 1.5.

Height measurements showed decreases in growth throughout the experiment for all treatments except the nitric and 50-50 acid treatments at pHs of 2.0 and 1.5, which maintain fairly constant growth. Analysis of nitrate, phosphorous, and potassium levels in the soil indicated heavy leaching of the nitrates and potassium from most soil samples, which probably account …

Autumn Olive Reproduction In Three Illinois State Parks, James Daniel Nestleroad

Masters Theses

No abstract provided.

Natural Variation And Regulation Of Floral Ultraviolet Absorption In Coreopsis And Bidens, Ron Scogin

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Use Of Hydroelectric Dams To Control Evaporation And Salinity In The Colorado River System, Larry J. Paulson

Publications (WR)

The main stem reservoirs on the Colorado River comprise one of the largest and most heavily used freshwater bodies in the nation. These reservoirs (Lake Powell, Lake Mead, Lake Mohave and Lake Havasu) can store up to 53,590,400 acre-feet of water at their maximum capacities. Nonetheless, local water shortages still exist in some areas of the Colorado River Basin. There is also concern that salt concentrations are approaching levels that could severely affect municipal and agricultural uses. Water shortages will become even more acute as demands for water increase with continued urban and agricultural development in the basin. Water conservation …

Historical Patterns Of Phytoplankton Productivity In Lake Mead, Richard T. Prentki, Larry J. Paulson

Publications (WR)

Lake Mead was impounded in 1935 by the construction of Hoover Dam. The Colorado River was unregulated prior to then and therefore was subjected to extreme variations in flows and suspended sediment loads. Hoover Dam stabilized flows and reduced suspended sediment loads downstream, but Lake Mead still received silt-laden inflows from the upper Colorado River Basin. The Colorado River contributed 97% of the suspended sediment inputs to Lake Mead, and up to 140 x 1O⁶ metric tons (t) entered the reservoir in years of high runoff. Most of the sediments were deposited in the river channel and formed an …

The Influence Of Lake Powell On The Suspended Sediment-Phosphorus Dynamics Of The Colorado River Inflow To Lake Mead, T. D. Evans, Larry J. Paulson

Publications (WR)

The Colorado River has been successively modified by the construction of several reservoirs, beginning in 1935 with the formation of Lake Mead by Hoover Dam. These reservoirs are located in a chain, and each one has an influence on the nutrient dynamics and productivity of the river and downstream reservoir. Lake Mead derives 98% of its annual inflow from the Colorado River. Historically, the Colorado River inflow was unregulated into Lake Mead. Regulation occurred in 1963, when Lake Powell was impounded by the construction of Glen Canyon Dam, approximately 450 km upstream. The formation of Lake Powell drastically altered the …

Enteric Infections In Stockton, California : With Special Reference To The Genus Campylobacter, Tom Edward Hathorn

University of the Pacific Theses and Dissertations

During the last two or three years, the three largest hospitals in Stockton (St. Joseph’s, Dameron and San Joaquin General Hospitals) have modified their procedures to include the search for Campylobacter. On the other hand, the incidence of Yersinia in California is unknown, as most clinical laboratories do not specifically culture for it. There have been only a few reports of Yersinia in this state (personal communication of Dennis Ferrero, Director of the San Joaquin County Public Health Laboratory). This study has a threefold purpose: to investigate the incidences of Campylobacter and Yersinia, especially in relation to the incidence of …

Ultrafiltration Of Skim Milk Prior To Cottage Cheese Making, Izhar H. Athar

Electronic Theses and Dissertations

Cottage cheese has the largest sales volume potential of all cultured dairy products in the United States today. Moreover, it can be a highly profitable product if proper control is exercised during its manufacturing (46). Commercial production of cottage cheese utilizes a significant portion of the total fluid milk produced in the U. S.A. After the 1955's, yearly per capita consumption of cottage cheese increased from 1. 7 7 kg (3.9 lb) to a high of 2. 45 kg (5.4 lb) in 1972 (67) . Consumer demand for lower fat dairy products gradually increased, which put more pricing emphasis on …

Some Effects Of Naturally Occurring Amygdalin On Female C3h/Hej Mice, Gareth Eli Shemesh

Master's Theses

No abstract provided.

Eucalypts: Energy Tree Of The Future?, Richard B. Pearce

Richard B. Pearce Archival Documents

This article by Richard B. Pearce was published in the January 1983 issue of American Forest. It examines the potential of eucalyptus species as a renewable energy resource. Discusses research on the rapid growth and cultivation of eucalyptus trees and their increasing interest to American foresters for energy production.

The Cousteau Log Centering On Marine Animals For Elementary School Children, Annie Suffron

All Graduate Projects

"Centering on Marine Animals for Elementary School Children" was a multi-curricular learning center design in four parts. It consisted of an introduction on Bubbles the Whale, including a picture, a puppet, a song, a Sea Script, and task cards. Following the introduction were three units on Sea Monsters of the World, the Migration of the Grey Whale, and the Ecology of the Southern Sea Otter. Each unit contained a picture of the sea animal, a puppet, a song, a Sea Script, a Quiz, map(s), and task cards.