SOIL IMPROVEMENTS
As gardeners we do our best to grow top
quality plants, whether it is trees, shrubs, roses, herbaceous borders, rock
gardens, a beautiful lawn, flowers,
fruit and vegetables. Every plant has its
own requirements for cultural needs, location, shelter and soil. If you want
the perfect lawn, the soil must have excellent drainage, as this benefits the
growth of the fine grasses and discourages diseases and moss. The best golf
courses are often found on sandy coastal links ground.
Kyle and Scarlet double digging |
Tares green manure |
Roses prefer a deep fertile clay soil and
rock garden plants need well drained stony soils. Fruit and vegetables grow
best on well drained fertile soil, though root crops fare best when the land
was well manured for a crop the previous year, otherwise the roots will tend to
split.
Allotment gardens are usually a mixture of
fruit, vegetables, some flowers to brighten up the plot, a compost heap, a wee
shed for tools, storage and shelter, and a greenhouse for the tomatoes, a
grapevine and bringing on the young plants from seed. We all have a competitive
spirit, so crop size, weight or flower power is very important if we are to
keep up with other plot holders. This is where soil fertility comes in as each
crop has its own needs. We resolve this issue with crop rotation and dig,
manure and use green manures according to crop requirements. Some people use a
three year rotation with potatoes and roots followed by brassicas and these to
be followed by the heavy feeders of onions, leeks, peas,
beans, sweet corn,
courgettes and pumpkins. Rotation is important to keep ahead of diseases, but
with so many new crops to try out, a four year rotation may be a better choice.
I also incorporate my strawberries into the rotation as these get dug out every
three years with new runners planted on new soil. Once you get the rotation
organised you will know in advance what crops will receive the most compost
(the heavy feeders) those that get a lesser amount (potatoes and brassicas) and
those that don’t get any (the rootcrops.) You need this information in late
autumn as you start the winter digging incorporating compost as planned. Retain
some compost to add to potato furrows as well as extra at planting time for
courgettes and pumpkins. I plan to complete digging by Christmas though sometimes
weather has a say in matters and some areas may have a winter mix of green
manures which can be left till the end of winter. Always leave the soil surface
as rough as possible as
this will expose a large surface area for weathering by
winter frosts.
Ryegrass green manure |
Compost heap needs turning |
Keeping a good compost heap is essential for
adding organic matter to increase soil fertility. I add anything that is of
plant origin though it gets chopped up first to help it rot down. Rhubarb
leaves, disease free potato haulms, grass clippings, annual weeds, kitchen
waste, autumn leaves and wood shreddings from pruned roses and fruit bushes.
Having access to cow or horse manure is a bonus.
Some plants such as sweet peas will benefit
from taking a foot deep trench out and forking up the bottom adding compost as
you proceed. This double digging is also essential for permanent planting of
roses, raspberry rows, new trees and other fruit bushes likely to be left for
ten or more years.
Liming the brassica patch |
The land allocated for brassicas, (cabbage,
sprouts, cauliflower, kale) is normally given a dusting of lime as all of these
plants prefer a higher pH value than most other crops. However it is better to
buy in a soil testing kit and test the soil to find out what its pH value is
then apply the correct amount of lime. Add the lime towards the end of winter
but well in advance of planting.
Green manures sown in late summer onwards or
in spring for late planted crops will add a huge benefit of organic matter,
added nitrogen and other trace elements and help to break up a stiff soil.
Wee jobs to do this week
Geranium stock plants |
As autumn begins to fade and winter weather arrives it is
time to remove geraniums from tubs, borders and hanging baskets. Although we
have had a few mild winters they seldom survive once the temperatures drop.
They can be cut back and potted up with good compost as stock plants and kept
in a cool but frost free greenhouse or windowsill. Once they put on some growth
the tops can be taken out for cuttings as well as keeping the plants stocky.
Then in spring and early summer as the young cuttings begin to grow upwards
take out the tops to encourage them to branch and use these tops as another
batch of cuttings to increase stock for the summer display.
END
END