Symptoms of nutritional deficiency in cupuacu plants (Theobroma grandiflorum) grown in nutrient solution

Salvador, J.O.; Muraoka, T.; Rossetto, R.; Ribeiro, G. de A.

Scientia Agricola 51(3): 407-414

1994


Accession: 002974139

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Abstract
In greenhouse trials, seedlings of T. grandiflorum were transferred to pots and given Hoagland & Arnon (1950) nutrient solution deficient in either N, P, K, Ca, Mg, S, B, Cu, Fe, Mn or Zn or none of these and grown to a height of ~30 cm. During this time all visual symptoms of each nutrient deficiency were described; the results are tabulated and illustrated with colour photographs. Nutrient contents were analysed in leaves showing symptoms 8 and 10 months after commencement of treatment, thus confirming the nutritional cause of these symptoms. The site of first deficiency symptoms varied between nutrients, according to individual mobility. The standard reference leaf for analysis of nutrient status in coca, the 3rd leaf from the apex, was considered suitable in T. grandiflorum for all nutrients except Cu.