Nutrient content and removal by shallots using a commonly available imported Indian variety was determined by destructive sampling. The objective was to establish the nutrient removal at maturity and at various stages of growth. The bulbs were planted on peat soil at the MARDI Research Station, Klang. Fertilizer N:P2O5:K2O:Y:MgO 12:12:17:2 at 1 200 kg/ha was split into four applications at 1, 3, 5, and 7 weeks from planting. Micronutrients were also applied at the recommended rate for peat soils. The pH of the soil at the time of planting was 6.2. A foliar fertilizer was sprayed weekly as a deliberate measure to ensure no nutrient stress and for the potential growth of the variety under local conditions to be achieved. Sampling was done at 2, 4, and 6 weeks and at maturity (9 weeks). The samples at maturity were separated into bulbs and leaves while in the earlier samples the leaves were not separated from the immature bulbs.

With a land-use factor of 0.5 the calculated mean bulb yield was obtained at 6.6 t/ha. The major nutrients removed per hectare at maturity were 29.8 kg N, 4.03 kg P, 28.5 kg K, 9.60 kg Ca, and 4.8 kg Mg. Less than 150 g/ha of micronutrients were removed by the mature plants in the order Fe > Zn > B > Mn > Cu. This paper also presents the nutrient contents and removal at various stages of growth.

Vimala, P. and Yeong, N.H. (1994). NUTRIENT CONTENT AND REMOVAL BY SHALLOTS GROWN ON PEAT IN MALAYSIA. Acta Hortic. 358, 415-418
DOI: 10.17660/ActaHortic.1994.358.68

Acta Horticulturae