Resumo

GIL C., ARLETTE IVONNE; MARROQUIN M., MIGUEL  e  MARTINEZ C., LUCILA. Effect of zinc on the induction of productive branches in the purple passion fruit (Passiflora edulis Sims). rev.colomb.cienc.hortic. [online]. 2012, vol.6, n.2, pp.152-160. ISSN 2011-2173.

In the region of Sumapaz (Cundinamarca), the culture of the purple passion fruit (Passiflora edulis Sims) presents diminution in flowering and fructification after the first harvest cycle, affecting production. An alternative consists of implementing agronomical practices to increase the effectiveness in each of the cycles. We evaluated the method of application and doses of two fertilizers that contain zinc (Zn) with productive branches, due to its intervention in the formation of auxins by enzymatic activation in the synthesis of tryptophan, the precursor of indoleacetic acid (IAA). The experiment was carried out in the municipality of Granada (Cundinamarca), with 18-month-old plants, with a design of randomized complete blocks with three repetitions and five treatments: chelated zinc (10%) at doses of 3, 6 and 9 kg ha^-1 of Zn applied in a foliar form every 15 days with a total of eight applications; zinc sulfate (28%) in an edaphic form with a dose of 6 kg ha^-1 of Zn with two applications every month; and one control treatment. Every 15 days, data for the length of the productive branches and number of productive buds were taken. For length of branches, statistical differences from 45 days were obtained, with the foliar applications having the better results. For number of buds, statistical differences between treatments were not obtained due to the fact that increases in productive branches were reflected in elongation and increase in the internode distance. The best results were obtained by applying chelated zinc in a foliar form, at a dose of 3 kg ha^-1 of Zn.

Palavras-chave : chelates; auxins; tryptophan; foliar fertilization.

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