الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
Two field experiments were conducted at Zarzoora Experiment
Station at EI- Behaira governorate in 1993 and 1994 seasons to study
the effect of some reducing temperature intercropping patterns
(having different geometrical configurations) of maize and potato at
the end of summer season to enable earlier potato planting, checked
with potato cv. Diamant and maize cv. T.W.C. 310 grown in pure
stand.
Intercropping treatments included: two intereropping systems, i.e.,
the straight potato ridge system whieh includes three reducing
temperature patterns: growing potato on one side of the ridge and maize
on the other side at 30, 60 and 90 em apart (maize in the latter two
patterns was thinned at two plants/ hill) and the alternative ridge system
which includes maize: potato ridge ratios (1: 1), (1: 2) and (1: 3).
Rectangularity of maize in the straight potato ridge patterns were 30 x 70,
60 x 70 and 90 x 70 em and in the alternative ridge patterns 60 x 140,
60 x 210, 60 x 280 em and for potato 25 x 70 em in the straight potato
ridge system and 25 x 140, 25 x 210, 25 x 280 em in alternative
ridge patterns .
..,
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. The results obtained could be swnmarized as follows:
1- Effect of intercropping on growth, yield components and yield of
potato:
1- The results revealed that intercropping maize with potato had no any
measurable effect on potato’ height. There was a tendency for potato
height to increase with narrowing distances between maize plants in
the straight potato ridge system, and also with the increase of potato
ridges in the association in the atternative system.. The height of
intercropped potato plants tended to exceed the solid potato plants.
2- Number of branches! plant was statistically influenced by
intercropping. Intercropping diminished the number of branches/
plant. The nwnber of branches/ plant increased in favour of
rectangularity in both the straight potato ridge system or ill the
alternative ridge system. There were gradual increases in the number
of branches! plant when maize spacing widened or when potato ridge
increased in the first and second intercropping system. The number
of branches! plant in the straight potato ridge system was always
lower than that measured in the alternative system.
3- The total fresh weight of potato plant grown in pure stand exceeded
that obtained from any intercropping pattern. The average total fresh
weight values obtained from potato plants grown in the straight
potato ridge system were always appreciably lower than those
obtained from the alternative system. It was also evident that when
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one ridge of maize was alternated with three ridges of potato the
heaviest weight of potato plants (characterized with most
rectangularity) was recorded, whereas, the equal alternative pattern
(I: 1) produced the lowest weight of potato plants (characterized with
least rectangularity). When maize plants were spaced at 30 cm apart
in the straight potato ridge system (characterized with least
rectangularity), potato plants recorded the least weight, whereas, with
maize plants spaced at 90 em apart, the heaviest weight of potato
plants was obtained. The fresh weight of foliage followed the same
trend.
4- Results of the fresh weight of shoot! total weight of plant indicate that
the ratio increased up to the widest spaced maize plants in the
straight potato ridge system and in (1: 3) pattern in the alternative
system. Shoot! total whole plant weight ratio in (1: 3) pattern
exceeded that recorded on pure stand potato.
5- Weight of fresh stems (tubers) followed the general trend, i.e., the
values of the alternative system were much higher than those of the
straight potato ridge system. Within each intercropping system,
widening distances between maize plants in the straight potato system
and increasing the number of potato ridge in the alternative system
resulted in increased fresh weight of tubers. The trait was also under
the rectangularity influence. The weight of fresh tubers of potato
grown in pure stand was higher than those obtained from both
intercropping systems.