EVALUATION OF SOME PRE-AND POSTEMERGENCE HERBICIDES FOR WEED CONTROL IN IRRIGATED WHEAT ( Triticum aestivum L.) AT KADAWA
EVALUATION OF SOME PRE-AND POSTEMERGENCE HERBICIDES FOR WEED CONTROL IN IRRIGATED WHEAT ( Triticum aestivum L.) AT KADAWA
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Date
2006-05
Authors
EMEGHARA, URSULLA UKAMAKA
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Abstract
Three post-emergence herbicides (Propanil plus 2,4-D, propanil plus bentazon and 2,4-D) and five
pre-emergence herbicides (Oxadiazon, Metolachlor plus atrazine, metolachlor plus terbutryne,
atrazine and metolachlor plus prometryne) at various rates were evaluated during the two dry seasons
of 2002/03 and 2003/04, at Kadawa in the Sudan Savannah of Nigeria. Oxadiazon at 1.0 kg a.i/ha,
propanil plus bentazon at 2.0 + 1.0 kg a.i/ha and metolachlor plus prometryne at 1.25 + 1.25 kg a.i/ha
gave consistent low weed cover score and weed dry weight and enhanced crop growth parameters
(crop vigour score, number of tillers, crop establishment score, plant height and total dry matter)
yield and yield components (1000 grain weight, grain weight per spike, spike length, as well as grain
yield). Sole rates of atrazine at 1.5 and 2.0 kg a.i/ha and its mixtures with metolachlor at 1.0 + 0.5,
1.33 + 0.66 and 1.66 +0.83 kg a.i/ha gave effective weed control up to 6WAS but significantly
reduced wheat grain yield. Sole atrazine treatments particularly at 2.0 kg a.i/ha proved phytotoxic to
wheat with noticeable symptoms of growth depression as reflected in crop vigour score, crop
establishment score, plant height, total dry matter and grain yield comparable to the weedy check.
Uncontrolled weed growth throughout the crop's life cycle resulted in 43.72 percent mean yield loss
compared to the best treatment (metolachlor plus prometryne at 1.25 + 1.25 kg a.i/ha) in the trial.
Description
A thesis submitted to the postgraduate school,
Ahmadu Bello University in partial fulfillment of
the requirement for the degree of master of
science in Agronomy.
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA.
MAY, 2006
Keywords
EVALUATION,, PRE-AND POSTEMERGENCE, HERBICIDES,, WEED,, CONTROL,, IRRIGATED,, WHEAT,, ( Triticum aestivum L.), KADAWA.