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The Effects Of Pre-Emergence Applications Of Simazine And Post-Emergence Applications Of Dalapon On Physio-Chemical Changes In Apple, Sour Cherry, Sweet Cherry, And Prunus Mahaleb, Jawad Thanoon Agha

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Simazine and dalapon have been used to control weeds in many crops during the last few years, but in 1963, when this study was begun, their uses in fruit orchards were limited. To study the effects of simazine and dalapon both on the control of weeds and on various metabolic changes in apple (Malis pumila), Montmorency sour cherry (Prunus cerasus), sweet cherry (Prunus avium), and Prunus mahaleb root stock, experiments were conducted from 1964 through 1966 in both the field and in the greenhouse.

The application of a low dosage of simazine (4 lb/A) to soil around twelve-year-old Montmorency sour …

Morphological Development In Relation To Cold Hardiness Of Dormant Peach Fruit Buds, Schuyler Dranna Seeley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The morphological development of Elberta peach fruit buds was studied in relation to their cold hardiness.

Morphological development of peach fruit buds was observed beginning with bud differentiation in mid-summer. Flower initiation was essentially complete by September. Growth was slow in the winter months but increased rapidly as anthesis approached. Photomicrographs were taken to substantiate the discussion .

Cold hardiness determinations were made from December until anthesis in April. The hardiness level was greatest during December and remained at a relatively high level until rest ended. Hardiness decreased thereafter. Major losses of hardiness occurred just prior to anthesis.

The Morphological And Anatomical Effects Of Pyrazon On Beans And Pigweed, James E. Rodebush

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Morphological and anatomical effects of pyrazon, 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone, on Phaseolus vulgaris L. and Amaranthus retroflexus L. were studied after treatment of seeds or seedlings at various pyrazon concentration, exposure times and environmental regimes.

Beans treated with pyrazon developed various chlorotic and necrotic symptoms on the unifoliate leaves. Chlorosis and necrosis were observed first on the leaf margins. Beans treated with pyrazon under a complete dark regime developed symptoms much later than those under an alternating light and dark regime. Pyrazon treated pigweed displayed symptoms similar to those on beans.

Pyrazon induced abnormal chloroplasts and graded cellular collapse in the unifoliate leaves …

A Study Of The Influence Of Petroleum Mulches On Several Herbicides With Selected Vegetable Crops, C. Linnis Mills

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The effects of petroleum mulches on plant response to herbicides were studied at the Farmington Field Station. The herbicides were applied to the soil preemergent and by incorporation at one-half, normal and double the recommended rates with asphalt overlay. The herbicides and crops used were: Atrazine and Ramrod on sweet corn, PEBC and Diphenamid on tomatoes and EPTC and Trifluralin on snap beans.

Germination, overall crop rating, grass and broad leafed weed control and yields were measured. Data recorded from these trials showed that herbicides are as effective under the asphalt when compared to plots with herbicide but no asphalt. …

Effect Of Gibberellic Acid And Chilling On Nucleic Acids During Germination Of Dormant Peach Seed, Yuh-Nan Lin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A study of nucleic acid changes influenced by gibberellic acid and chilling treatments in peach seed was performed in an attempt to reach a better understanding of the mechanism involved in breaking seed dormancy.

Gibberellic acid and the chilling treatment increased the RNA content. These two treatments which break dormancy also increased RNA, suggesting a similar mechanism involving RNA. Chilled seeds contained more RNA than did the gibberellic acid treated seeds.

DNA content remained unchanged regardless of treatment.

Dry seed had a greater ribonuclease activity than with soaked seeds. Enzyme changes did not correlate well with the RNA content in …

Effect Of Stage Of Seedling Development On Absorption Of Selected Pre-Emergent Herbicides, Pairoj Suchinda

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Using radioautography ¹⁴C simazine, ¹⁴C EPTC, ¹⁴C 2,4-D, ¹⁴14 DCPA and ¹⁴C pyrazon absorption by seeds of bean (Phaseolus vulgaris L.), squash (Cucurbita maxima), corn (Zea mays), onion (Allium cepa) and oat (Avena sativa) was studied. Simazine, EPTC, 2,4-D and pyrazon were absorbed through the seed coat of bean, squash, corn and onion, the amount increasing with time. Little DCPA was absorbed by seeds of bean, squash, onion and oat. Distribution and translocation of ¹⁴C simazine, ¹⁴C EPTC and ¹⁴C pyrazon occurred in …

An Experimental Study Of Variation Within And Between Populations Of Petrophytum Caespitosum (Nutt.) Rydb. With Emphasis On Numerical Techniques, Frank R. Drysdale

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nine populations of sixty-eight individuals representing the distribution of Petrophytum caespitosum (Nutt.) Rydb. (Rosaceae) in the Intermountain Region were investigated for taxonomically significant variation using numerical techniques. On the basis of 19 morphological characters 3 subspecific taxa are recognized. Two taxa are existing subspecies: P. caespitosum (Nutt.) Rydb. var. caespitosum and P. caespitosum (Nutt.) Rydb. var. elatius (S. Wats.) Tides. One new subspecies is described: P. caespitosum (Nutt.) Rydb. var. latifolium. The ecology of the species is discussed. The floral and vegetative anatomy are described. Chromosome counts of 3 populations have given n = 9. A list of herbarium …

The Influence Of Petroleum Mulch On The Germination And Yield Of Tomatoes, Clarence Frank Williams

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The effects of petroleum mulches on the emergence and yield of tomatoes were studied at the Farmington Field Station, Greenville Field Station, North Logan, and the greenhouse. The mulches were applied as surface overlays above the seed or incorporating before planting.

Seedling emergence and yields were measured. Data recorded from trials conducted under cool weather conditions indicated that petroleum mulch overlays can be effective in increasing seedling emergence.

The increased seedling emergence with petroleum mulch is due to increased soil temperature, less moisture loss from the surface, and a minimum of soil crust formation.