CROP ROTATION
Crop rotation plan for 2019 |
We may be in mid
winter and as it’s a wee bit cold outdoors, and the first snow flakes have
arrived, so better to do some indoor gardening. Now is a good time to look at
the new allotment plan using last years plan as a template and sorting out
where this year’s crops are to be grown. I checked over last years seed list a
few weeks ago, then adjusted the list for 2019 and ordered my seeds online from
a
well known trusted supplier. I always follow a rotation of crops over a four
year cycle to try and keep ahead of diseases such as clubroot and onion white
rot as well as giving plants the best growing conditions as their needs all
vary individually. I also integrate my strawberry beds into the rotation as
these get replanted every three years onto fresh soil.
Peas, leeks and onions |
Crops with similar
needs are grouped together. Thus the brassicas, cabbage, cauliflower, sprouts
and kale are grown in one block. This block gets compost dug in over winter,
then limed in late February. This assists the prevention of clubroot disease
which is
a major problem on my allotment. Unfortunately, some salads, i.e.
rocket, and radish are also prone to clubroot as well as the root crops, Swedes
and turnips. Then care must be taken with use of green manures as mustard, a
great crop for green manuring, can also attract and carry over clubroot
disease. I use clubroot resistant vegetables where ever possible; intercrop
some salads with widely spaced sprouts and cabbage early in the season to catch
a crop before the big leafy plants take up all the room.
Sweet corn radish and mezuna |
The brassica patch
becomes the heavy feeders patch the following year. These are the peas, beans,
onions, leeks, sweet corn, courgettes and pumpkins. These crops are fine on
land limed the
previous year and are given the lion’s share of compost or
manure during the winter digging. I also hold back some extra compost to add to
the courgettes and pumpkin bed to improve fertility and retain moisture. The
pumpkins, courgettes and sweet corn are tender plants so they don’t get planted
till the end of May or early June. This gives us time to sow a fast growing
green manure crop like clover or rye grass to be ready for digging in about
three weeks ahead of planting.
A good year for sprouts |
This area the
following year becomes the root crop patch for parsnips, carrots, beetroot,
Swedes and turnip. This land does not get compost during the winter digging as
there is plenty of well rotted organic matter left over from the heavy feeders,
and anyway the roots are liable to forking if there is fresh compost in the
soil. Salad crops are also fine in this patch as they are short lived and do
not need a lot of space. In my rotation I add some flower crops such as
dahlias, chrysanthemums and gladioli for cut flowers as well as brightening up
the plot.
Digging in the green manure |
My last rotational
crop is the potatoes, which get both plenty compost and usually follow an
autumn green manure crop. They do not like an alkaline soil which makes the
tubers liable to scab, but should be fine on land a few years after liming for
the brassica crop. I also hold back some compost to spread along the bottom of
the furrow taken out when planting the seed potatoes.
Salads in succession |
Strawberries are
another great crop to help with the rotation. I grow an early row of Mae,
Honeoye or Christine, two maincrop rows of Symphony and Florence and the autumn
variety Flamenco and crop for no more than three years before digging in. This
gives me extra land to bring into the rotation. New strawberry beds come from
strong healthy runners from the older beds in autumn after cropping has
finished, then the old plants are dug out and added to the compost heap
together with any straw bedded down between the rows. Be careful with the
autumn fruiting varieties as good runners are only produced on young plants.
Once they are three years old they can be very reluctant to throw out new
runners.
Aconites |
Wee jobs to do this week
Winter may now be
with us as the mild weather could not last forever, but it has allowed the
first spring bulbs to flower. The snowdrops first appeared in December and the
aconites in January and February, but enjoy them while they last as before too
long the crocus will be coming out to let us know winter is coming to an end.
END