McWhorter, C.G. and Anderson, J.M. (1981) The technical and economic effects of johnsongrass (Sorghum halepense) control in soybeans (Glycine max). Weed Science, 29 (3). pp. 245-253.
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Abstract
The effect of Sorghum halepense on soybean yields, grades and net returns was determined by regression analysis of data from 252 trial plots between 1971 and 1976. S. halepense control from 0 to 100% was achieved through various combinations of fallow, dalapon at 8.3 kg/ha surface-applied before sowing and trifluralin at 0.8 to 1.7 kg/ha incorporated before sowing. Repeated use of trifluralin at 1.7 kg/ha with or without summer fallow was the most profitable treatment. Foreign material in soybean soil samples was about 0.8% with 100% control of S. halepense and nearly 6% with no control. At least 70% control of S. halepense was required to avoid excessive soybean seed moisture levels. Control of S. halepense above 60% tended to increase soybean test weights. With 100% S. halepense control, about 1.2% of soybean seed was damaged, whereas, without S. halepense control, about 1.7% of seed was damaged. The level of S. halepense control had little effect on the level of split soybean seed at harvest; however, nearly 100% S. halepense control was necessary to provide U.S. No 1 grade soybeans. Soybean yields were increased 4.8 and 6.2% for each 10% increase in S. halepense control when plots were not fallowed or after fallowing, respectively. Net returns in soybean production were nearly twice as great with 100% S. halepense control compared with no control. From summary.ADDITIONAL ABSTRACT:The effect of S. halepense on soyabean yields, grades and net returns were determined by regression analysis of data from 252 field research plots from 1971 to 1976. Repeated usage of 1.7 kg trifluralin/ha with or without use of summer fallow provided the most effective soyabean production. At least 70% S. halepense control was required to avoid deductions from gross harvested wt. caused by seed m.c. exceeding 13%. S. halepense control reduced the percentage of damaged seeds. Yields were increased 4.8 or 6.2% for each 10% increase in S. halepense control when plots were not fallowed or after fallowing, resp.ADDITIONAL ABSTRACT:The effect of Sorghum halepense on soybean yields, grades and net returns was determined by regression analysis of data from 252 trial plots between 1971 and 1976. Net returns in soybean production were nearly twice as great with 100% S. halepense control compared with no control
| Item Type: | Article |
|---|---|
| Author Affiliation: | US Department of Agriculture, Southern Weed Science Laboratory, Stoneville, Mississippi 38776, USA |
| Subjects: | Plant Protection |
| Divisions: | Sorghum Soyabean |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 08 Aug 2012 03:49 |
| Last Modified: | 08 Aug 2012 03:50 |
| Official URL: | http://www.jstor.org/stable/i386175 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/7226 |
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