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Citrus trees are very hungry feeders with high requirements for trace elements. A regular spray with a seaweed fertiliser such as Natrakelp will supply trace elements. Fertilise citrus trees in April/May; always water the tree well after fertilising. Never place fertiliser close to the trunk or in heaps, spread it as evenly as possible to just past the drip-line of the tree. Compost or animal manures can be used starting with about 4 kg for a 1-year-old tree to 20 kg for a mature 8-year-old tree. In November/December apply lime or dolomite if necessary to correct the pH.
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Blood and bone contains mainly nitrogen and phosphorus, boost it into a more ‘complete’ fertiliser by adding a ¼ cup of sulphate of potash to every kilo of blood and bone."
And this
" A tree that is one to two years old will need from one quarter to one half pound of fertilizer, spread throughout the year.
For trees two to three years old, you can expect to use from one half pound to three quarters of a pound.
Three- to four-year-old trees need from three quarters of a pound to a pound and a half.
Trees four to five years old use from one to two pounds of fertilizer.
Five- to six-year-old trees need one pound and a quarter to two and a half pounds a year.
Adult trees may use anywhere from one and a half pounds to three pounds.
All amounts are spread out over the year. Divide each amount by three and space fertilizer applications evenly throughout the season."
And this
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Supply a good source of nitrogen because it is the biggest requirement of citrus trees. Nitrogen is not hard to find as a soil amendment, and keeping it organic is as simple as applying grass clippings from a lawn grown without chemical fertilizers or pesticides or herbicides. If you keep animals, the composted manure is an excellent nitrogen source.
Step 2
Apply a good source of phosphorus for good
flower and fruit production. Bone meal tends to be the best source, but because you cannot guarantee that it is organic, another recommended source is phosphate rock. It will also add calcium to the soil, and you don't have to worry about it burning the roots of your citrus tree.
Step 3
Add a good all-purpose composted humus to make sure all the other nutrients are present for the citrus tree's growth. If you make your own humus, you can guarantee that it is organic. Use your own ground leaves and lawn clippings, and give them enough time to turn into rich dark humus.
Step 4
Work all of the above fertilizers into the soil around the tree. Citrus trees do not like mulch, as it encourages mold growth, and do like to have good drainage to keep their roots dry. Do not dig so deep as to disturb the roots.
Step 5
Apply a compost tea to the leaves of the tree by spraying it during your fertilizing routine. This will supply all the nutrients necessary for quick absorption through the leaves. You might have to use a pressurized system to spray the foliar fertilizer to the top of larger trees."
I have not been able to find a specific recipe using your ingredients.