Control of Brush Regrowth with Herbicides on Pine Plantations in Northern California PDF Download
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Author: Jay Russell Bentley
Publisher:
ISBN:
Category : Brush
Languages : en
Pages : 22
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Book Description
On large plots cleared in 1961 at three California mountain locations, different herbicide treatments were applied once, twice, or three times in consecutive years, beginning in 1962. Results were evaluated in 1965. A single spray was unsatisfactory; only the initial seedlings and weaker sprouting plants were killed, and many new seedlings became established in 1963 and 1964. Two consecutive sprays greatly reduced brush competition, but many of the vigorous sprouts survived along with numerous new seedlings. Three sprays killed almost all of the most resistant plants; only very thin brush stands of low vigor survived. Broadcast sprays were more effective than hand applications in killing dense stands of seedlings. Either 2,4-D or 2,4,5-T, or a mixture of the two, was effective in repeated applications at 3 to 4 pounds, a.e., per acre. Dosages of 2 pounds generally were ineffective; 8 pounds was excessive. Test results were successfully applied in helicopter sprays in subsequent years.
Author: Jay Russell Bentley
Publisher:
ISBN:
Category : Brush
Languages : en
Pages : 22
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Book Description
On large plots cleared in 1961 at three California mountain locations, different herbicide treatments were applied once, twice, or three times in consecutive years, beginning in 1962. Results were evaluated in 1965. A single spray was unsatisfactory; only the initial seedlings and weaker sprouting plants were killed, and many new seedlings became established in 1963 and 1964. Two consecutive sprays greatly reduced brush competition, but many of the vigorous sprouts survived along with numerous new seedlings. Three sprays killed almost all of the most resistant plants; only very thin brush stands of low vigor survived. Broadcast sprays were more effective than hand applications in killing dense stands of seedlings. Either 2,4-D or 2,4,5-T, or a mixture of the two, was effective in repeated applications at 3 to 4 pounds, a.e., per acre. Dosages of 2 pounds generally were ineffective; 8 pounds was excessive. Test results were successfully applied in helicopter sprays in subsequent years.
Author: Jay R. Bentley
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages :
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Author: J.R. Bentley
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Book Description
Author: Philip M. McDonald
Publisher:
ISBN:
Category : Plant competition
Languages : en
Pages : 32
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Book Description
Planted ponderosa pine (Pinus ponderosa Dougl. ex Laws. var. ponderosa) seedlings in young plantations in California are at a disadvantage compared with competing shrubs, forbs, and grasses. In many instances, roots of competing plants begin expanding and exploiting the soil earlier and in greater numbers, thereby capturing the majority of available resources and lowering pine survival and growth. Competition thresholds or "how much is too much?" are: for treatments where a cleared radius is prescribed, no weeds are acceptable within the space needed for maximum growth of pine seedlings during the establishment period; for treatments involving the entire area, crown cover values of 10 to 30 percent seem to be the level beyond which shrub competition significantly affects pine growth. Methods for preparing the site, which include mechanical and chemical methods, use of fire, and combinations of treatments, show the interaction of site and ensuing vegetation. Techniques for controlling competing vegetation from seed include preventing such plants from getting started by use of preemergent herbicides or mats (collars). To prevent sprouting, hardwood trees and large shrubs can be pushed over, thereby getting the root crown out of the ground, or if still in the soil, grinding it out with a machine. Once present, the effect of weeds from seed can be minimized by grubbing or spraying when young, by grazing plants with cattle or sheep, or by introducing plants of low competitive ability. Once sprouting weeds are present, their effect can be minimized by spraying with chemicals, or if palatable, by grazing with cattle or sheep. Costs range from as low as $10 per acre ($25/ha) for aerially applying herbicides to $711 per acre ($1757/ha) for grinding out tanoak stumps.
Author: Philip M. McDonald
Publisher:
ISBN:
Category : Abies magnifica
Languages : en
Pages : 24
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Author: Jay Russell Bentley
Publisher:
ISBN:
Category : Brush
Languages : en
Pages : 6
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Author: Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 574
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 428
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Author: Lisle R. Green
Publisher:
ISBN:
Category : Fuelbreaks
Languages : en
Pages : 92
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Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 250
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