| dc.creator |
Melton , Ken David |
|
| dc.date |
2011 -02 -18T23 :02 :05Z |
|
| dc.date |
2012 -06 -01T14 :33 :00Z |
|
| dc.date |
2011 -02 -18T23 :02 :05Z |
|
| dc.date |
2012 -06 -01T14 :33 :00Z |
|
| dc.date |
2011 -02 -18T23 :02 :05Z |
|
| dc.date |
1998 -01 -01 |
|
| dc.date.accessioned |
2012 -11 -29T19 :49 :01Z |
|
| dc.date.available |
2012 -11 -29T19 :49 :01Z |
|
| dc.date.issued |
2012 -11 -29 |
|
| dc.identifier |
http : / /hdl .handle .net /2346 /19295 |
|
| dc.identifier.uri |
http : / /hdl .handle .net /2346 /19295 |
|
| dc.description |
Selected levels of herbicide and non -chemical weed control measures were employed in cotton , corn , and grain sorghum on the Texas High Plains in 1992 and 1993 to examine their efficacy , crop response , and the subsequent economic effects . Weed pressure was heavy in the cotton plots , and moderate in the sorghum and corn plots . Records of all weed control expenses were maintained . Yields were obtained from each plot in order to calculate the gross crop value and return over weed control costs .
Cotton production and returns over weed control costs were greatly improved by herbicide use in both years , and the highest herbicide input gave the highest consistent return of any treatment . In both 1992 and 1993 , sorghum yields were increased when herbicides were added to weed control regime . However , none of the weed control measures in sorghum showed any economic advantage over using no weed management at all . This was related to unnecessary herbicide inputs in some treatments and low weed pressure . Results with corn were very similar to sorghum .
Traditionally , the Texas High Plains , having an average yearly rainfall of approximately only 15 to 17 inches , is considered to have low weed pressure and low weed species diversity as compared to the eastern half of the country .
Most certainly higher rainfall areas with greater weed pressure and diversity would meet with greater costs in controlling weeds , and that must be taken into account when considering the results of this study .
Sorption and mobility of 14C labeled pyrithiobac were evaluated for three Texas High Plains cotton -growing soils by utilizing a batch slurry method and soil thin layer chromatography . Sorption studies showed pyrithiobac was moderately adsorbed to all three soils , regardless of clay or organic matter content . However , the herbicide was easily desorbed from the soil , indicating the herbicide to be moderately mobile . Soil thin layer studies also indicated pyrithiobac to be a mobile herbicide , regardless of soil clay or organic matter content . |
|
| dc.language |
en _US |
|
| dc.publisher |
Texas Tech University |
|
| dc.rights |
unrestricted |
|
| dc.subject |
Weeds - - Control - - Economic aspects |
|
| dc.subject |
Pyrithiobac - - Economic aspects |
|
| dc.subject |
Weeds - - Control - - Environmental aspects |
|
| dc.subject |
Field crops - - Texas - - High Plains |
|
| dc.subject |
Herbicides - - Economic aspects |
|
| dc.subject |
Field crops - - Weed control |
|
| dc.title |
Performance and economics of selected weed management systems in corn , cotton , and grain sorghum and the behavior of pyrithiobac on three Texas High Plains soils |
|
| dc.type |
Electronic Dissertation |
|