Nitrogen remobilized from the tree’s reserves support spur leaves growth until petal fall. Roots take up nitrogen mainly after bloom, to support shoot and root growth. Nitrogen goes into fruit mainly after the stage of fruit's intense cell division.
Recommended N-P-K-Ca-Mg ratios, applied by fertigation via drip irrigation, across main growth stages of Cherry trees, with an expected yield of 15-20 MT/ha.
Potassium nitrate should be used as the primary source of potassium, and a partial source of nitrogen. The balance of nitrogen should be sourced from calcium nitrate, magnesium nitrate and ammonium nitrate, as per the above-mentioned phase-specific rates.