The following plan is suggested for achieve the mentioned requirements, for table-grapes grapevines, e.g. 'Thompson Seedless', with an activity period of 240 days, and an expected yield of 25 MT/ha, by fertigation via drip irrigation.
Potassium nitrate (predominantly Ultrasol®) 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 sulphate, as per the following phase-specific rates.
This plan presents the mineral nutrition scheme, in terms of the mass proportions between the macro-, and secondary- nutrients.