2002 Volume 1 Issue 3 Pages 199-204
Growth, yield and uptake of nutrients were compared in strawberry (Fragaria × ananassa Duch. cv. Nyoho) grown with peat-based substrate (3 peat-moss: 1 RW granules) under CO2-enriched conditions (700-900 ppm, 16 November to 8 April), and supplied with three nutrient solutions. As the ratio of the absorbed amount of P and K to that of N increased with CO2 enrichment, 1 mM of KH2PO4 was added to the standard solution (N: 8.85, P: 0.85, K: 3.90, Ca: 2.05, Mg: 0.93 mM) containing micro elements. Absorption of P and K, and concentration of P in leaves increased in the plants supplied the solution containing additional KH2PO4, but the concentration of K in leaves was similar to that in those grown with the standard solution. When plants were supplied with a soluble fertilizer containing Ca, Mg and micro elements (N: 8.83, P: 0.94, K: 3.04, Ca: 0.89, Mg: 0.44 mM), absorbed amount of Ca and Mg decreased to ca. 50% of that in those grown with the standard solution. However, no symptom of Ca or Mg deficiency was observed and the concentration in the leaves did not decrease. Plant growth and fruit yield were similar among plants supplied with the three different solutions. It was suggested that a commercial soluble fertilizer, not a balanced solution formulated by nutrient absorption of strawberry, can be applied for strawberry production with peat based-substrate.
