Efficacy of herbicides on controlling Conyza stricta in sugarcane planteddifferent geometries
2003
Khan, E.A. | Khan, M.A. | Ahmad, H.K. | Himayatullah, H.,Gomal Univ., D.I.Khan (Pakistan). Dept. of Agronomy
Different herbicides were evaluated for the control of Conyza stricta insugarcane planted at different planting geometries under agro- ecologicalconditions of D.I. Khan, Pakistan during 2000-2001 and 2001- 2002. Theexperiments were conducted in randomized complete block design with splitplot arrangement with each treatment replicated thrice. Main plots comprisedof planting geometries whereas the sub plots comprised of herbicides. Datawere recorded on weed population, weed dry weight, sugarcane stalks/stool,stem girth, cane yield in tons per hectare and Benefit cost ratio (BCR).Planting geometries significantly differed for weed and sugarcane parameters.The highest decrease in the weed population and dry matter was accounted inthe planting geometries of triple rows at 120 cm. It significantly increasedsugarcane parameters and produced the highest yield of 58.2 t ha-1 whenaveraged across herbicides and year. All the herbicides significantly decreasedweed population and dry weight and increased sugarcane stalks per meter andyield. The herbicide 2,4-D alone procured the maximum yield of 48.22 t ha-1when averaged across geometries. The control gave significantly lowest yieldof 33.38 t ha-1. The herbicide 2,4-D registered the highest benefit cost ratio(BCR) of 2.19 and the highest gross income of Rs. 51913 at planting geometryof triple row at 120 cm. The lowest BCR ration of 1.72 with the lowest grossincome of Rs. 36164 was depicted in the control. It is suggested that forobtaining economic yield from sugarcane at D.I. Khan, it may be planted intriple rows 120 cm apart with application of 2,4-D for control of Conyzastricta.
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