M"y, L974 - MSpace at the University of Manitoba

alkaloíd exÈraction and was not readily destroyed by heat" He proposed
that the substance thaÈ caused lupinosis r¡¡as noË preformed in lupins,
but was a by product of the growth of a micro-organism. Thís theory
gained the support of Gardiner (1966) and l^Iarmelo eË al. (1970) who found
that lupinosis was not associated wíth alkaloid conterlt buË with the
growÈh of Ëhe fungus Phomops'Ls Leptostrom|foz,m.Ls on the lupin plant an¿
seed" They proposed that lupinosis r¡ras caused by nycotoxicosis caused
by this fungus. This relaËionshíp can explain why lupinosis also occurs
when srnreet lupins are fed to livestock"
1.8 AGRONOMIC CHARACTERISTICS
1"Bl Seed Yield
Seed yields ín most countries tend to be erratic or in some cases
not adequate as compared to other land uses, however, thís is common to
all papilionaceous plants. They are all extremely sensitive to Eempera-
ture' moisture and other environmental factors which results in yield
fluctuaËions. Due to unreliable seed yields, lupins are most cormnonly
used as forage or for green-manuring.
Seed production seems to be favoured in countries such as South
Africa and Australia rather Ëhan in cool temperate climates, as is shown
by the expansíon ín production of lupin seed in the latter whic.h has
doubled annually sínce 1-967 from L222 ha to 56,700 ha in 1972 (Founrain,
L973).
Recent yield data does not seem to be available, therefore
reference r¡í11 be uade to the time when lupín cultivation was at
in many counËries " HackbarËh (1955) sr:mmarized yíe1ds of lupins
límited
a peak
ín
+I