Ottimizzare la coltura in aiuola

Page 5/6 Optimization tips for growing cyclamen in California adapted for outdoor use In the following chart expressed in ppm we propose constant concentrations from 50 up to 75 ppm of Nitrogen and 150 ppm of Potassium for the growing stage. This balance contributes to more compact plants and reduces the water de- mand when the temperatures and the watering frequency are high. In flowering stage (November/December) when the average temperature and the watering frequency are lower, we even propose 150 ppm N and 300 ppm of Potassium. From November onwards and when the daily average temperature is around 15°C (60°F) the Nitrogen is mainly taken up by the flowers and less by the leaves. For early flowering stages during the months of August/September we propose our Tianis ® series, maintaining the feeding growing stage method as for Latinia ® . 4 . Feeding - Slow release fertilizer of which the newest versions are available in different release rates and balances. This option is the easiest and the most practical, even though it is always subject to sudden changes of temperatures and strong rains when the crop is grown under shade cloth. In facilities where ventilation is not optimum it is better not to choose for this option. There are two options of fertilizer throughout the culture time: - Water soluble fertilizer during irrigation with an injector located in the production area and adaptable to the hose. This is a safer and more economic option than the first one. Thanks to the control of the E.C. the grower can either reduce the amount of feeding in case of heat, or increase it in case of strong rains. This option makes additional supply possible when from November to January the irrigation frequencies are lower. It is then important to increase the E.C. , in particular for the flowering stage. When using a soil provided with preplanting fertilizer (SME 2-3 ms/cm and 75/100 ppm N) it is advisable to initiate the feeding four weeks after spacing. Until then, water with clear water. - Slow release fertilizer with moderate release + complementary liquid fertilizer : this alternative combines both options. The hardness of the water, its calcium and magnesium degree, is to be verified by means of a water analysis in order to select a suitable fertilizer. In case of hard water many fertilizers acidify with ammonium (NH 4 ). It is recommended not to exceed more than 5% of Nitrogen in ammoniacal form. This Nitrogen source accelerates the demand of water and consequently unbalances the irrigation guidelines. Nutrients needs in growing and flowering stage NUTRIENTS ppm or mg/l Nitrogen Potassium Phosphorus Calcium Magnesium Iron NO 3 - N K+ K 2 Or H 2 PO 4 - P 2 Or 5 Ca 2+ CaO Mg 2+ MgO Fe 2+ LATINIA® Growing Stage 200-300 50-75 120-130 150 100 70 50 75 12 20 1 LATINIA ® Flowering Stage 650 150 240-260 300 100 70 50 75 12 20 1