Combating Mn & Fe deficiencies in Gerbera
Source: FlowerTech 1999, vol. 2/ no. 2, p.30.
A deficiency of nutrients such as manganese and iron can affect the size and other floral characteristic of the Gerbera.
Manganese deficiency leads to the younger leaves displaying interveinel chlorosis with small chlorotic patches.
With a severe deficiency, the patches spread and coalesce, resulting in chlorotic mottling. Subsequently the foliage turns yellow leaving the veins green.
Iron deficiency initially appears as chlorosis at the basal portion of the leaves and spreads towards the anterior leaf margin, showing yellow-green chlorotic mottling. The chlorotic areas turn brown and show necrosis.
To correct these deficiencies, a combined foliar spray of manganese sulphate and ferrous sulphate each at 200 mg/litre of water twice at an interval of 15 days over the foliage, during April-May will help to increase the size and number of flowers.