Paclobutrazol and ammonium and potassium thiosulphates in mango 'Haden' production.
Aņez Q. M.
Author Affiliation: Agricultural and Sea Sciences Program, University Ezequiel Zamora (UNELLEZ), Guanare 3350, Portuguesa, Venezuela.
: 419-423
Abstract : Field studies were conducted in Venezuela, to analyse the effect of paclobutrazol (PBZ), alone or combined with ammonium thiosulfate (ATS) or potassium thiosulfate (PTS), on mango cv. Haden production. A total of 14 treatments comprised: control; PBZ alone (10 ml/tree); PBZ + ATS at 0.5, 1.0 and 2.0%; and PBZ + PTS at 1.0, 2.0 and 4.0%. To complete the other 12 treatments, the last 6 were applied at 60 and 90 days after PBZ was applied. The treatments were applied in both years. The variables evaluated were: fruit number per plant; fructification index; and yield per plant, per canopy lateral surface and per stem cross section. The treatments showed no statistical differences for any of the variables studied. However, mean values of ATS treatments were higher than PTS treatments for all variables. There was a reduction of mean values in almost all variables for the second year, except in fruit number per plant and fructification index for mean values of PTS treatments. The results suggested a positive effect of nitrogen on the yield of mango cv. Haden. It was not recommendable to use PTS at 4.0%, because of burning of the young leaves and the margin of old leaves.