Gardening Without Irrigation: or without much, anyway
ly Rainle
ut irrigation but is just irregular enough to be worrisome. West of the Cas
ressed vegetables suffer greatly. Because I had not yet noticed how plant spacing affects soil moisture loss
of the Cascades, so I recommended adding 1 1/2 inches of
ll West of the Ca
May June July
.0 2.1 0.7 0
.0 1.4 0.98 0
.3 2.1 1.3 0
2.2 2.1 1.6 0
.6 2.7 2.5 1.
.1 1.9 1.6 0.
.4 1.7 1.6 0.
2.3 1.8 1.9 1
3.3 2.8 2.5
1.2 1.0 0.9 0
en et al., The Water
h.: Lewis Pub
tops and plant survival may be threatened. The earth loses water when wind blows, when sun shines, when air temp
mum Temper
ugust
ka,
ord,
ne,
ria,
pia,
tle,
ngham
uver,
ria,
he Water E
might seem, bare soil may not lose much moisture at all. I now know it is next to impossible to anticipate moisture loss from soil without first specifying the vegetation there.
m Reservoirs (i
May June July
.1 2.7 3.4 3.
5 3.4 4.4 6.
3.6 5.0 7.1 8
he Water E
to use to support conventional agriculture in various parts of the West. Comparing this data for Seattle with the estimates based on reservoir evaporation shows pretty go
rrigation R
Growing Seas
Duratio
ma Valley Apr
Valley May-
nd May-Se
r Umpqua Valley
r Coquille Valle
nia April-
he Water E
thout irrigation west of the Cascades. But there is water already present in the soil when the gardening season begins. By creatively using and conserving
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