Portal de Periódicos da CAPES

Mineral composition and visual symptoms of nutrients deficiencies in Curaua plants ('Ananas comosus' var. 'erectifolius')

2014; Southern Cross Publishing; Volume: 8; Issue: 5 Linguagem: Inglês

1835-2693

Ismael de Jesus Matos Viégas, Rosa de Nazare Paes da Silva, Diocléa Almeida Seabra Silva, Cândido Ferreira de Oliveira Neto, Heráclito Eugênio Oliveira da Conceição, Gleciane da Silva Mascarenhas, Ricardo Shigueru Okumura, Lucila Elizabeth Fragoso Monfort, Raimundo Thiago Lima da Silva,

Pineapple and bromelain studies

Curaua plant (Ananas comosus var. erectifolius) is a producer of high strength fibers and because of this quality, it is used by textile, automotive and pulp factories. However, despite the promising scenario, researches have been incipient, particularly in the area of mineral nutrition, in relation to their nutritional requirements. The aim of this study was to evaluate nutritional and biochemical responses in curaua plants exposed to the - macronutrients deficiency. The experimental design was a randomized block design with seven treatments (complete and individual omissions N, P, K, Ca, Mg and S) and four replications. The omission of individual macronutrient showed deficiency symptoms well defined and promoted reduction in plant growth, wherein the omission of potassium was the most limiting factor to the development of the plant. The foliar contents with complete treatment and control (omission of macronutrients) were: N: 11.8 - 25.2 g kg-1; P: 0.3 - 5.8 g kg-1; K: 8.2 - 22.2 g kg-1; Ca: 1.9 - 3.4 g kg-1; Mg: 0.5 - 2.9 g kg-1; S: 0.6 - 2.8 g kg-1. The omission of N resulted in decreased amounts of amino acids (34.6 - 54.1 umol g-1), proteins (3.4 - 22.5 mg g-1), carbohydrates (0.5 - 0.6 mmol g-1), nitrate (0.5 - 65.3 umol g-1) and ammonia (25.6 - 75.2 mmol kg-1). Meanwhile, the omissions of other macronutrients promoted increases in the percentages of carbohydrates (lack of P), ammonia, amino acids (lack of K), starch (lack of Ca) and nitrate (lack of of S).