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Full-Text Articles in Life Sciences
Diapause In The Boll Weevil, Anthonontus Grandis Boheman, As Related To Fruiting Activity In The Cotton Plant, F. L. Carter, Jacob R. Phillips
Diapause In The Boll Weevil, Anthonontus Grandis Boheman, As Related To Fruiting Activity In The Cotton Plant, F. L. Carter, Jacob R. Phillips
Journal of the Arkansas Academy of Science
Studies in Arkansas show that boll weevil diapause is related to changes in fruiting activity of the cotton plant. Generally, when larval development took place while fruiting levels were increasing or being held at a high level, diapause in resulting adults was low (0-20%). Diapause was approximately 20-50% when larval development coincided with decreasing fruiting levels, and was 50-100% as true cut-out approached. Regrowth cotton generally lowered diapause incidence and as fruiting levels decreased, diapause increased. Therefore, the boll weevil not only responds to short photoperiods that are characteristic during the fall in the temperate zone, but also may respond …
Effects Of Intensive N-K Fertilization On Exchangeable Ca And K In A Soil Profile, R. A. Allured, Lyell F. Thompson
Effects Of Intensive N-K Fertilization On Exchangeable Ca And K In A Soil Profile, R. A. Allured, Lyell F. Thompson
Journal of the Arkansas Academy of Science
Over a 4-yr period fertilizers having three N and five K levels in a factorial arrangement were applied in a replicated, randomized complete block design to coastal bermudagrass (Cynodon dactylon L.) growing on a Pembroke silt loam just north of Fayetteville. In the spring of the fifth year (1972) soil samples were taken from a 3.67-m profile of each plot. Nine depth samples from the profile of each plot were analyzed for exchangeable K and Ca. Potassium fertilizer, especially at the higher rates, and where no N was applied, greatly increased exchangeable K levels only in the top 45 cm …
Dry Matter And Minerals In Loblolly Pine Plantation On Four Arkansas Soils, Timothy T. Ku, James D. Burton
Dry Matter And Minerals In Loblolly Pine Plantation On Four Arkansas Soils, Timothy T. Ku, James D. Burton
Journal of the Arkansas Academy of Science
Average contents of N, P, K, Ca, and Na and total above ground dry matter were determined in 19-year-old unthinned loblolly pine (Pinus taeda L.) plantations in southeastern Arkansas. Three stands were sampled on each of four sites: well and poorly drained coastal plain soils and well and poorly drained loessial soils. Total dry weights, determined from 15 felled trees on each of the 12 plots, ranged from 127,000 kg/ha on poorly drained loessial soil to 173,300 kg/ha on poorly drained coastal plain soil. Ranking of sites, in descending order of production of dry matter, P, K, and Na was: …
Observation On Natural Outcropping In The Tomato (Lycopersicon Esculentum L.) In Northwest Arkansas, Alvin F. Reeves
Observation On Natural Outcropping In The Tomato (Lycopersicon Esculentum L.) In Northwest Arkansas, Alvin F. Reeves
Journal of the Arkansas Academy of Science
A single tomato plant homozygous for the recessive anthocyaninless mutant, ae, was grown in the middle of an experimental tomato plot at the University of Arkansas Agronomy Experimental Station Farm in Fayetteville. Progeny tests of seeds harvested from this plant indicated that only 0.7% of the seeds were the result of outcrossing to other plants
Taxonomic Relationship Of Hybrid Peafowl-Guineafowl: Preliminary Study Of Serum Proteins, Earl L. Hanebrink, Charles Gruver, Richard Van Grouw
Taxonomic Relationship Of Hybrid Peafowl-Guineafowl: Preliminary Study Of Serum Proteins, Earl L. Hanebrink, Charles Gruver, Richard Van Grouw
Journal of the Arkansas Academy of Science
Disc electrophoresis of serum proteins was conducted for the peafowl, guineafowl, peafowl-guineafowl hybrid, and domesticated chicken. The four birds analyzed are of the same order but family status has been questioned. Serum protein patterns for all birds were similar in the anodic regions but different in the cathodic regions. The peafowl-guineafowl hybrid showed a pattern more similar to that of the peafowl than to that of the guineafowl. In morphologic characters the hybrid also was more similar to the peahen than to the guineafowl. In the cathodic region the serum protein pattern of the guineafowl was more unlike the patterns …
Natural Areas And Reference Collections For Environmental Education In Some Arkansas Schools, Jewel E. Moore
Natural Areas And Reference Collections For Environmental Education In Some Arkansas Schools, Jewel E. Moore
Journal of the Arkansas Academy of Science
A survey of 20 school campuses throughout Arkansas showed that most lack natural areas for outdoor environmental education. For most Arkansas schools no checklists of local plants are available, and there are no reference collections at the schools. Projects are underway at State College of Arkansas to establish herberia for the woody plants of Arkansas and the vascular plants of Faulkner County.
Status Of The Mountain Lion In Arkansas, John A. Sealander, Philip S. Gipson
Status Of The Mountain Lion In Arkansas, John A. Sealander, Philip S. Gipson
Journal of the Arkansas Academy of Science
Two authenticated kill records of the mountain lion, Felis concolor, in Arkansas are reported as well as numerous reliable sight records spanning an approximately 30-year period. Distribution of sightings in the state is discussed in relation to an expanding deer population. The cougar probably never was exterminated in Arkansas but it still may be considered endangered.
Extractable Nutrients And Ph Values From Nine Soil Associations Of Arkansas, A. W. Tennille
Extractable Nutrients And Ph Values From Nine Soil Associations Of Arkansas, A. W. Tennille
Journal of the Arkansas Academy of Science
Soil samples from the 0-10-cm and 10-20-cm depths were obtained from nine of the 11 soli associations of Arkansas. Sites sampled had a heavy forest cover and showed no evidence of cultivation. Routine soil tests showed that pH values ranged from a low of 4.38 for the Loessial Hills to 5.83 in the Ozark Highlands. Potassium ranged from 69 to 206 kg/ha. Phosphorus was very low in nearly all sites; the extremes were 9 and 83 kg/ha, but most values were less than 30 kg/ha. Calcium ranged from 122 to 1,523 kg/ha. The data indicate that when woodland areas are …
Checklist Of Arkansas Fishes, Thomas M. Buchanan
Checklist Of Arkansas Fishes, Thomas M. Buchanan
Journal of the Arkansas Academy of Science
Arkansas has a large, diverse fish fauna consisting of 193 species known to have been collected from the state's waters. The checklist is an up-to-date listing of both native and introduced species, and is intended to correct some of the longstanding and more recent erroneous Arkansas records.
Respiration Rates Of Two Midge Species At Different Temperatures, George L. Harp, Robert S. Campbell
Respiration Rates Of Two Midge Species At Different Temperatures, George L. Harp, Robert S. Campbell
Journal of the Arkansas Academy of Science
Respiration values for Chironomus n. sp. ranged from 0.11 mm³ O₂ /mg/hr at 5C to 0.44 mm³ O₂. /gm/hr at 25C. The range for Chaoborus punctipennis was from 0.15 mm³ O₂ /mg/hr at 5C to 0.56 mm³ O₂ /mg/hr at 25C. These low respiratory rates allow the two species to withstand low oxygen tensions for extended periods of time. Reflecting this ability, both species attained their greatest numerical and biomass values in the profundal regions of three strip-mine lakes whose lower waters become oxygen depleted during thermal stratification.
Ichthyofaunal Diversification And Distribution In The Ozark Stream In Northcentral Arkansas, William Dale Jackson, George L. Harp
Ichthyofaunal Diversification And Distribution In The Ozark Stream In Northcentral Arkansas, William Dale Jackson, George L. Harp
Journal of the Arkansas Academy of Science
The distribution and diversity of the ichthyofauna of Arkansas are poorly known. This study is part of a continuing effort to elucidate the natural history of Arkansas. Big Creek is a relatively small, clear, cool-water stream in the Ozark Plateau of northcentral Arkansas. Big Creek and its tributaries drain into Lake Norfork, an impoundment on North Fork River. A total of 6,779 fish of 30 species was collected. Dominant pool species included Notropis boops, Fundulus catenatus, F. olivaceus, Labidesthes sicculus, and Campostoma anomalum; dominant riffle species included Etheostoma spectabile, E. caeruleum, Notropis boops, Fundulus catenatus, and Campostoma anomalum. The numerical …