Abstract
Obtaining nutrient accumulation curves is very important in knowing the plant nutritional requirement dynamics and to direct the strategies for its supply. The aim of this work was to study the uptake, compartmentalization and exportation of macronutrients of a snap bean genotype with determinate growth habit. An experiment at field conditions at Londrina State University – UEL, Londrina-PR, Br azil, was performed in a randomized block design with five replications, using UEL-1 genotype. It was observed that dry matter production, as nutrients accumulation, were slow until 20 days after emergence (DAE), V4 stage, and became more pronounced after that period. The macronutrients were more accumulated in the pods, except for Ca, which had the leaves as preferred organ. The maximum amounts of N, P, K, Ca, Mg and S uptaken were 91.0; 35.2; 131.1; 35.2; 9.1 and 4.7 kg ha-1, respectively, while exportation to produce each ton of pod’s fresh matter were 7.01 kg of N; 3.30 kg of P; 7.91 kg of K; 0.6 kg of Ca; 0.48 kg of Mg and 0.31 kg of S. One must pay attention to the proper management of quantity and epoch of N and K supply, because of the high demand and exportation of these nutrients. Key words: Phaseolus vulgaris L., plant nutrition, accumulation, demand.
Highlights
The snap bean (Phaseolus vulgaris L.) is a Fabaceae plant, the same species of the common bean, but differing from it by the consumption of the immature fruits, which are succulent with reduced fiber (Myers and Baggett, 1999)
The dry matter (DM) accumulation was low until the beginning of V4 stage, near 20 days after emergence (DAE), when the plant had only 13% in comparison with the maximum value
The fresh pod yield was 6 921.6 2 219.61 kg ha-1, similar to that obtained by Moreira et al (2009) for different snap bean genotypes with determinate growth habit at the same location in summer season
Summary
The snap bean (Phaseolus vulgaris L.) is a Fabaceae plant, the same species of the common bean, but differing from it by the consumption of the immature fruits (pods), which are succulent with reduced fiber (Myers and Baggett, 1999). In Brazil, the commercial production of snap bean occurs with the usage, mainly, of indeterminate growth habit genotypes. The reduced cycle, exemption from staking, concentrated harvest and the possibility of total mechanization are some of the advantages that make the determinate genotypes attractive to producers (Vidal et al, 2007; Moreira et al, 2009)
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