Manual control analysis of drug effects on driving performance

The effects of secobarbital, diazepam, alcohol, and marihuana on car-driver transfer functions obtained using a driving simulator were studied. The first three substances, all CNS depressants, reduced gain, crossover frequency, and coherence which resulted in poorer tracking performance. Marihuana also impaired tracking performance but the only effect on the transfer function parameters was to reduce coherence

Householder transformations and optimal linear combinations

Several theorems related to the Householder transformation and separability criteria are proven. Orthogonal transformations, topology, divergence, mathematical matrices, and group theory are discussed

Plant Beds

Due to the occurrence of blue mold and manganese toxicity in some of the plant beds this last spring, it is probably advisable for all growers to select a new site for the 1964 crop. Blue mold is a fungus disease which sometimes causes severe damage to tobacco seedings just prior to setting time. The fungus will produce heavy-walled spores on the dying or dead leaves. These spores are capable of remaining in the soil at least a year and attacking the next crop of plants if the same site is used again for tobacco plants

A New Black Shank Resistant Hybrid

Seed of a new black shank resistant burley hybrid will be available to growers in 1964. This hybrid is especially for farmers who cannot rotate their tobacco land and . thus, are forced to set their crop in a black shank infested field. The hybrid is a cross between two black shank resistant varieties, MS L8 and Burley 37. The female parent , MS L8, carries black shank resistance from a wild relative of tobacco

Determine Liming Needs on Tobacco Land This Fall

There have been far too many reports of manganese toxicity in tobacco this season for a condition which is so easily corrected. Manganese is one of the minor elements necessary for plant growth, but it is needed in very small amounts. When large amounts are taken up by a tobacco plant, light green or yellowish areas appear between the larger veins of the leaf. In severe cases the plant may be stunted or even die

Organic Toxicity

In recent years there has been much discussion on the subject of organic matter toxicity and its relation to the severity of black root rot of tobacco. Organic matter toxicity is due to or at least related to toxins produced during organic matter decomposition

Fall Treatment of Tobacco Beds with Methyl Bromide

Treating tobacco beds with methyl bromide for the purpose of killing weed seed has become very popular in recent years. The gas is effective except on the seed of white clover and when the soil temperature is below 50° F

Sucker Control Chemicals for Use on Burley Tobacco

Maleic hydrazide (MH) formulations containing 3 pounds per gallon of active ingredient can no longer be manufactured for sale in the United States. However, all 3-pound MH formulations that were manufactured before October, 1981 can be sold until the supply of that formulation is exhausted. MH formulations containing 1.5 or 2.25 pounds of active ingredient (Potassium salt of MH) can still be manufactured and sold in the U.S. for controlling suckers on tobacco

Calcium Deficiency Symptoms in Burley Tobacco

Calcium is an element required by all higher plants in relatively large quantities. It appears to be closely related to the formation of buds and flowers. Calcium is usually available in sufficient quantities in Kentucky soils to produce a normal crop of tobacco. However, when certain varieties of burley tobacco commence to bloom and produce suckers, the tips of the calyx lobes of the flowers may turn brown and die and the edges of the small leaves of the suckers may be necrotic, resulting in irregularly shaped sucker leaves. In severe cases the apical bud may be killed. These calcium deficiency symptoms are most often observed during periods of stress such as protracted dry periods. This condition has been found to be heritable and is apparently caused by the improper utilization by the plant rather than the lack of calcium in the soil