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• W184958208 abstract "In the vet tropical areas of Queensland Acacia flavescens regenerates from seed following the destruction of simple sclerophyll-mesophyll vine forests, layered sclerophyll forests, eucalypt grassy woodlands, and sclerophyll shrub woodlands.Because extensive areas in the Tully district are being sown to tropical pastures for cattle finishing, it became desirable to study the A. flavescens seedling regeneration problem after land clearing, and if possible, find a practical means of control. Absence of a suitable crop necessitates that A. flavescens be controlled during the pasture establishment phase.A. flavescens flowers regularly but seed set is apparently sporadic. A hard seed coat does however help ensure the survival of the species. Pire and mechanical damage encourage root shoots (suckers). The results of seven field experiments and six pot and laboratory investigations carried out during the period June 1963 to October 1966 are reported. Acacia seedling numbers in new pasture were reduced where Panioum maximum had established satisfactory through the use of superphosphate. There was however, no evidence to suggest that shading by pasture plants would prevent A. flavescens germination. Nevertheless, where seeds were germinated in darkness the hypocotyl became abnormally swollen. When grown in light these seedlings either died, or were stunted, because they had difficulty in shedding the testa. Even so, it is improbable that this was the cause of seedling mortality on phosphate fertilized plots. Acacia seedlings responded markedly to phosphate when grown in 35% of full daylight but at I5% the response was negligible. Therefore it was concluded, that in the field, shading by sown species may have been one of the factors preventing the response of Acacia to superphosphate. Only in the absence of phosphate fertilizing did 2, 4, 5-T pr&-plant spraying for Acacia seedling control show advantage over conventional cultivation. This was because pasture seedlings had difficulty in establishing on the compacted surface of sprayed plots. For successful establishment of Panicum maximum it was essential to first destroy the existing grass cover with cultivation. 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) and 4-amino-3,5,6-trichloropicolinic acid (picloram) were equally effective in controlling Acacia seedlings, but 2,4-dichlorophenoxyacetic acid (2, 4-D) had no effect once phyllodes had formed. Picloram was however considerably more damaging to the pasture legume Stylosanthes guyanensis (stylo) than was 2, 4, 5-T and also more persistent in the soil. It had however, virtually disappeared in the field from the top 38 in. of soil 15 months after applying 1 Ib/ac. It is likely that leaching accounted for some of this loss, as the soil was sandy and 148 in. of rain had fallen. Diesel distillate was superior to water as a 2, 4, 5-T carrier for the control of A. flavescens seedlings, but this was not so with suckers. Contact injury to sucker foliage from the high volume rate of distillate tested may have been the reason for its failure. Dibutyl phthalate, when mixed at high concentrations with diesel distillate, reduced the effectiveness of foliar applications of 2, 4, 5-T on Acacia seedlings. Satisfactory control of both A. flavescens suckers and seedlings was achieved by applying 2, 4, 5-T at 1 to 2 Ib/ac. in water. 2, 4, 5-T at 3/4 Ib/ac. in diesel distillate also controlled seedlings. It was concluded that permanent damage to stylo from 2, 4, 5-T is probably best minimized by allowing seed to set before spraying. Where Acacia infestations are sparse control by spot treatments are effective." @default.
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• W184958208 date "1969-01-01" @default.
• W184958208 modified "2023-09-27" @default.
• W184958208 title "The control of Acacia flavescens A. Cunn. ex. Benth. : in relation to the establishment of improved pastures in the wet tropical areas of Queensland." @default.
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