Page 113 - Tài liệu cây cảnh Bonsai4me Bonsai Basics

more.

Trees that are dormant or sick should not be fed as they will not consume the
same level of Nitrogen and salt levels in the soil can build up if care is not taken.
It is often recommended that newly repotted trees should not be fed for at
least six weeks to avoid burning new roots.
However, there is now much anecdotal advice and some scientific evidence
that promotes the advantages of feeding straight after rootpruning and repotting.
Immediately after root pruning, a plant will require additional nutrients to grow
and repair roots, particularly phosphorous and potassium. A low nitrogen feed
would be very beneficial to the plant and unlikely to burn the roots.
Do's and Don'ts of Fertilising
Do use fertilisers regularly; they are essential to the health of your bonsai

and produce strong, vigorous growth.
Do use the correct NPK balance; by feeding with an incorrectly balanced
fertiliser you can encourage root or flower growth at the expense of leaf and
shoot growth.
Do check the requirements of individual species; different species can
require different quantities of fertiliser at different times of the year.
Don't feed trees when they are not in active growth as the fertiliser level
builds up unused in the compost, potentially resulting in an excessive build of
salts.
Don't feed trees that are not growing due to poor health for the same reason;
feeding a sick tree is unlikely to encourage it to grow and is likely to do more
harm than good.
A Guide to Common Fertilisers

Before using some of the more commonly found garden fertilisers on your
bonsai, it is worth considering what effect they may have on your trees, here is a
list of the basic NPK ratings of some common garden fertilisers and their
suitability for bonsai.
TOMATO FEEDS 6:5:9 High in potassium to encourage strong flower and
fruit production at the expense of leaf growth.
LAWN FEEDS 40:10:0 Extremely high in Nitrogen to encourage very lush
green top growth at the expense of anything else. Will rapidly burn root system.
BONEMEAL 4:20:0 High in phosphorous to encourage strong root growth,
useful for applying to coniferous bonsai in Autumn.
FISH MEAL 6:6:0 Lacks potassium. Can be used in conjunction with other

fertilisers to create solid slow-release fertiliser.
GROWMORE 7:7:7 A good balanced garden fertiliser that can be used for