TOLERANCE OF SOYABEAN (Glycine max (L.)Merr.), COWPEA (Vigna unreuiculata (L.) Walp.), GROUNDNUT (Arachis hypogaea L.) AND BAMBARANUT (Voandzeia subterranea (L.) Thou.) TO IMAZETHAPYR
TOLERANCE OF SOYABEAN (Glycine max (L.)Merr.), COWPEA (Vigna unreuiculata (L.) Walp.), GROUNDNUT (Arachis hypogaea L.) AND BAMBARANUT (Voandzeia subterranea (L.) Thou.) TO IMAZETHAPYR
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Date
1994-06
Authors
DZOMEKU, ISRAEL KWAME
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Abstract
The tolerance of selected leguminous crops namely:
SJoyabean (Glycine max (L.) Merr., Var, Samsoy-2)f cowpea
(Vigna unguiculatq. (L. ) Walp., Var. Sampea-7), groundnut
(Arachis hypogaea L., Var. Samnut-8) and bambaranut
(Voandzeia subterranea (L.) Thou., Var. "Gurjiya" )to
pre-emergence application of imaze thapyr ( ( + )-5-ethyl-2-
(4~isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl) nicotinic
acid) was studied in the screenhouse and field at Samaru
(11o , 11o N; 7o, 38'E) in the northern Guinea savanna
zone of Nigeria, during the 1992 wet season. The soil
was of sandy loam texture, having a pH of 4.7 and 0 . 5 4%
organic carbon.
Imazethapyr at 0.15 - 1.00kg a.i/ha in the screenhouse
and 0.05 - 0.60kg a.i/ha in the field did not affect
crop emergence and establishment. Rates of 0.05 -
0.23kg a.i/ha were the most tolerated treatments and
resulted in greater yields than higher rates. While
the herbicide was moderately tolerated at 0.30 -
0.45 kg a.i/ha, 0.50 - 1.0kg a.i/ha caused severe
injury in the legumes.
The crops exhibited differential response to
imazethapyr. Soyabean and groundnut were more
sensitive to lower rates of imazethapyr than cowpea
and bambaranut. While the performance of the ollcropssoyabean
and groundnut-became significantly depressed
by imazethapyr at 0.35kg a.i/ha and above. Significant
depression in the performance of the non-oilcrops-cowpea
and bambaranut- occurred at 0.45kg a.i/ha and above
However, the maximum tolerance level of imazethapyr
for groundnut, soyabean, cowpea and bambaranut were
obtained at 0.18, 0.19, 0.19 and 0.24 kg a.i/ha,
respectively. The most sensitive parameter in
soyabean and cowpea was days to 50% flowering, while
those of groundnut and bambaranut were grain yield and
crop vigour score at 20 DAS, respectively.
Grain yield of soyabean, groundnut and bambaranut
were negatively correlated with herbicide injury score
and number of days to 50°/o flowering and positively
correlated with crop vigour score, shoot dry weight,
pod yield and 100-grain/seed weight.
Description
A Thesis submitted to the Postgraduate School,
Ahmadu Bello University, in partial fulfillment of
the requirements for the degree of Master of Science
in Agronomy,
DEPARTMENT OF AGRONOMY
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA
22ND JUNE, 1994
Keywords
TOLERANCE,, SOYABEAN,, (Glycine max (L.)Merr.),, COWPEA,, (Vigna unreuiculata (L.) Walp.),, GROUNDNUT,, (Arachis hypogaea L.), BAMBARANUT, (Voandzeia subterranea (L.) Thou.), IMAZETHAPYR.