A regular programme incorporating the right type of fertilizer pays rich dividends for Apple trees, even older well established ones. A little effort and time results in larger fruits, better quality and more prolific yields. It also helps the trees to overcome attack from pests and diseases; like all of us, the healthier you are the less likely you are to succumb to bugs!
CHOOSING THE RIGHT FERTILIZER
A well balanced N.P.K fertilizer is always a good choice; but there are subtle differences between dessert and cooking varieties and their requirements. A general purpose N.P.K fertilizer will work well for both but if you really want to tailor your efforts specifically then choose a fertilizer with a higher potassium content [such as a rose fertilizer] since these varieties use more, and for culinary varieties one with more nitrogen.
HOW TO APPLY
The fertilizer should be applied in granular form and spread on the ground at the rate recommended by the manufacturer, at the edge of the branch canopy. Lightly rake in and then apply a mulch, not only to prevent moisture loss but also to aid uptake of the fertilizer and to make sure it stays where you want it.
WHEN TO USE IT
Annually in late winter, just before bud burst is the best time.
If you garden organically use blood fish and bone or organic potassium is available.
Handsome trusses like these depend on regular feeding.