Yield and Value of Burley 21 Tobacco as Influenced by Nitrogen Nutrition, Suckering Practice, and Harvest Date

An experiment was conducted in the field during 1966 on Maury silt loam soil to obtain information of the effects of agronomic factors on yield and value of Burley 21 tobacco . Ammonium nitrate fertilizer at varying rates, and concentrated super-phosphate and potassium sulfate at constant rates , were broadcast and disked in after plowing and before transplanting. All plots received irrigation water (sprinkler system) to supplement rainfall when soil moisture dropped below 60% of available moisture-holding capacity. Sucker control practices utilized were (a) no topping - no suckering, (b) topping - no suckering, (c) topping - hand suckering, and (d) topping - MH-30. Half of the tobacco was harvested early (about 1 week prior to maturity) and half late (1 week past maturity) . However, N fertilizer at the 400 lb/ acre N rate delayed maturity about 2 weeks beyond that for tobacco treated at the 100 and 200 N rates . Thus all the early harvests were made 1 week prior to maturity, the 100- and 200-lb N treated plots 2 weeks later, and the 400-lb N plots 4 weeks after the early harvest

The Effect of Nitrogen Rate and Method of Sucker Control on Dry Matter Accumulation in Different Plant Parts of Burley 21 Tobacco

Earlier research has shown that higher leaf yields of burley tobacco result from topping and controlling sucker (axillary bud) growth. Suckering practices which provide the greatest degree of sucker control generally result in highest leaf yields . Chemically suckering with maleic hydrazide (MH-30) and other chemicals provides for a higher degree of control than most hand sucker ing practices although hand sucker ing at frequent intervals may produce leaf yields comparable to those from use of maleic hydrazide. High leaf yields resulting from a high degree of sucker control has been attributed to the elimination of the use of photosynthate to produce suckers

Uptake and Distribution of Mineral Elements by Burley 21 Tobacco as Influenced by Nitrogen Nutrition and Suckering Practice

Knowledge of nutrient content of tobacco and of removal of nutrients from soil is essential to developing sound fertilization practices for tobacco. Quantities of nutrient elements taken·up by tobacco vary widely. This is because of variations in variety, soil fertility level, fertilizer application, soil moisture, plant population, and other environmental and cultural factors . We conducted the present study to determine the effects of applied N and suckering practice on the content of mineral elements in certain plant parts of burley tobacco

Senior Exhibition Show Card

Show card for Senior Exhibition featuring Karen E. O\u27Connor and Shawn Irvin Sims.https://digitalcommons.udallas.edu/senior_87-88/1000/thumbnail.jp

Dispersive Estimates for Harmonic Oscillator Systems

We consider a large class of harmonic systems, each defined as a quasi-free dynamics on the Weyl algebra over $\ell^2(\mathbb{Z}^d)$. In contrast to recently obtained, short-time locality estimates, known as Lieb-Robinson bounds, we prove a number of long-time dispersive estimates for these models

Intro to Ground Water Law in Colorado and Surface-Groundwater Conflicts in the South Platte

25 pages. Contains footnotes

Intro to Ground Water Law in Colorado and Surface-Groundwater Conflicts in the South Platte

25 pages. Contains footnotes

Effect of Lime and Source of Nitrogen Fertilizer on Yield and Chemical Composition of Burley Tobacco

Current trends in the fertilizer industry indicate a shift to greater production of ammonium forms of nitrogen fertilizer in comparison to nitrate forms. Reasons for these trends are many, but both economic and energy conservation are major factors. Generally, ammonium forms are produced with less, total energy and have higher nitrogen contents that permits lower production and transportation costs per unit of N. Agronomically, ammonium forms are less readily leached from soils, but produce acid as they are converted to nitrates by soil microorganisms. Thus, ammonium sources of nitrogen have both advantages and disadvantages as fertilizers for crops

Relationship between Soil pH and Yield of Burley Tobacco

Historically, use of soil with a pH of 5.6 to 5.8 has been recommended for producing best quality burley tobacco. This recommendation for a relatively low pH resulted from the reported increases in the incidence of certain diseases, notably black root rot (Thielaviopsis basicola) and black shank (Phytophthora parasitica), in soils with pH greater than 5.8. Additionally, some researchers have reported undesirable chemical properties of cured leaf grown on soils that had been limed. However, workers at the Kentucky Agricultural Experiment Station generally have reported favorable effects from use of lime on both yield and quality of tobacco grown in soil that initially was acid. These apparent conflicting views may be attributed to differences in soil Properties, lack of disease resistant varieties, incidence of disease organisms, and other conditions associated with the production of different tobacco types. The low rates of commercial fertilizer, especially nitrogen, applied to tobacco prior to about 1950 may have resulted in the successful production of burley in soils of low pH due to the relatively low acid-forming potential of such rates