To maximize and stabilize production, water and nutrient inputs should be provided when needed. The plants need continuous supply of water due to their shallow root system. Drought stress results in a decrease of plant growth, fruit size and productivity. Recommended fertilizer rates per hectare are 170 kg of nitrogen, 45 kg of phosphorus and 130 to 190 kg of potassium for intensive New Zealand production systems. Phosphorus and potassium are applied in the beginning of the season; nitrogen applications are distributed throughout the year.