Author(s):
W.G. McCully, W.J. Bowmer, J.L. Stubbendieck
Publication Date
December 1970
Abstract
Tests were installed during the period 1968-70 to investigate the modification of roadside soil materials restricted by physical or chemical characteristics limiting plant growth, to determine the utility of plant materials for roadside use, and to develop chemical treatments for controlling unwanted vegetation.|A plasticity index (PI) value greater than 16 signifies a poor tendency toward granulation and other properties desirable in a plant growth medium. This physical condition can be modified in some, but not all, cases by admixing agricultural gypsum, certain cationic polymers and polyurethane.|Sediments contained in materials from the Weches and Queen City formations may show pH as low as 1.8. This extreme acidity can be neutralized by lime applications as high as 50 tons per acre, based on potentiometric titration, to establish a vegetative cover. Maintenance surface lime applications, beginning 3 years after initial treatment, will be required to retain the sod cover.|Seedings in Texas for erosion control can be extended to the 15-inch isohyet provided the soil material is sandy, not extremely saline, and competitive plants are controlled.|Buffalograss at this time should be seeded in a mixture of other materials adapted to northwestern Texas, rather than alone.|Perennial weeds growing in shoulder pavements were controlled by program sprays of fenac/dicamba combined with either prometone or bromanil. Mowing adjacent to median plantings may be facilitated by a combination contact-pre-emergence treatment.
Report Number:
142-1
Link(s):
Document/Product
http://tti.tamu.edu/documents/142-1.pdf
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