• Subirrigation
(Continued from Page 1)
even in a wet year, Mitchell
points out.
•Several problems have been
noted, however. In material
presented at the American So
ciety of Agronomy annual meet
ing, Mitchell said roots plug
ging the small holes of the pipe
(is a major concern. The pipe
holes are extremely small and
the water is flowing slowly un
der low pressure; these factors
all encourage plugging, cutting
down irrigation effectiveness
In greenhouse studies under
conditions that encouiaged far
more concentiated loot growth
Kay
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than under field conditions,
plugging took place the first
one or two times the irrigation
system was used. Mitchell found
that briefly increasing pressure
to five pounds unplugged the
system, restoring as much as 95
percent. The brief pressure in
crease could be used in the
field to reduce plugging, Mit
chell believes.
Research also shows that the
crop being irrigated makes a
difference in the amount of
plugging Corn loots, for in
stance, cause less plugging than
alfalfa One reason may be that
small cavities form outside the
pipe holes more leadily with
corn When such spaces are
Good Management
pp
Rohrerstown, Pa.
Lancaster Fanning, Saturday. December 16,1967
present, finer poil particles and Did yQU know _ The purpose
roots may be less likely state Forests, accoidmg
ter tbe holes and cause plug- tQ Uw ISf „ To provide a con .
, . tmuous supply of timber, lum-
Although plugging is a prob- wood and other forest
lem in subirngation, it doesn t products, to protect the vvater
seem to be a great limitation on s heds, conserve the water, and
the effectiveness of the system. re g u j a t e the flow of rivers and
(Research will provide the an- , „,, , . .
swers, Mitchell believes. streams of the State and to fui ‘
Many improvements have msh opportunities for healthful
been made since the subirnga- recreation to the public ” (Dept
tion system was put down in of Forests and Waters)
the Georgetown substation Yet
even that system lesulted in an
average increase of 71 bushels Life’s evening will draw its
per acre of corn over a three character from life’s morning
and afteinoon.
year peilod,
and the
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5