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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/6446

Title: Effect of roundup-salt mixtures on weed control and soil microbial biomass under oil palm plantation
Authors: Nuertey, B.N.
. Tetteh, F.M
Opoku, A
. Afar, A. P.
Asamoah', . T.E.O
Issue Date: 2007
Publisher: Journal of Ghana Science Association,
Citation: Journal of Ghana Science Association, vol. 9 no. 2 , 2007
Abstract: Field experiments were conducted at Oil Palm Research Institute, Kusi from 2002 to 2004 to evalu­ ate the effect of roundup - salt mixtures on the control of weeds and soil microbial biomass. The efficacy of roundup at 0.47 kg a.i./ha mixed with either 0.23 kg/ha of sodium chloride or 0.53 kg/ha of ammonium sulphate or 0.24 kg/ha of urea was compared with roundup at 1.44 kg a.ilha and manual weeding. The treatments were arranged in randomized complete block design and repli­ cated four times. The roundup and its salt mixtures effectively controlled weeds up to 3 months after treatment (MAT) in both 2002 and 2003 trials. In 2002, roundup with sodium chloride, roundup with ammonium sulphate and roundup with urea maintained a substantial weed control of 77%, 79% and 87% respectively at 3 MAT compared to the 80% and 41% weed control by roundup only and manually weeding. By 3 MAT in 2003, the % weed control for roundup with sodium chloride, roundup with ammonium sulphate, roundup with urea, roundup only and manual weeding were 63%, 60%, 63%, 65% and 43% respectively. These weed control measures were however ineffective in the 2004 trial. The addition of ammonium sulphate or urea to roundup increased soil microbial C accumulation significantly by 115% and 650% respectively while the application of roundup with sodium chloride, roundup only and manual weeding stimulated microbial C accumulation slightly by 57%,33% and 30% respectively. Microbial P also increased by 267%,137%,81%, 75% and 45% following the application of roundup with urea, roundup with ammonium sulphate, roundup only, roundup with sodium chloride and manual weeding respectively. The use of roundup - salt mix­ tures reduced the annual cost of manual weeding per hectare by 76% (¢J,735,000) and annual cost of applying roundup at the labeled rate also by 47 % (¢480,000). The addition of salts to reduced rate of roundup is therefore a cost efficient strategy to control weeds in oil palm plantations.
Description: Journal of Ghana Science Association, vol. 9 no. 2,2007
URI: http://hdl.handle.net/123456789/6446
Appears in Collections:College of Agric and Natural Resources

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