Utilization of growth regulators on strawberry (Fragaria spp.) plant: influence on cycle and on yeld

Abstract

An experiment was conducted in the Experimental Area of Horticulture Section of Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba (SP), Brazil, in order to study the influence of some growth regulators on cycle and final production of strawberry, cv. Campinas and Monte Alegre. The following products were applied: indoleacetic acid (IAA), 30 ppm; 2-(3-chlorophenoxy) propionamid acid (CPA), 75 ppm; giberellic acid (GA3), 30 ppm; (2 - chloroethyl) trimethylammonium chloride (CCC), 1500 ppm; 1,2-dihydro-3,6-pyridazinedione (MH), 900 ppm; and succinic acid-2,2- dimethylhidrazide (SADH), 900 ppm. Dosages were sub-divided and applied in three times, one week interval starding three weeks after strawberry transplanting to field. Of was concluded that: a) the highest productions were reached with GA3, CPA and IAA; CCC induced smaller and more compact plants, but with medium to large fruits; and the lowest production was obtained with MH. b) Plants treated with GA3, CPA and IAA showed earlier fruit production, hoving GA3 and CPA induced the highest number of fruits, but in lower weight and medium volume; CCC, SADH and MH delayed iniciation of production. All products induced plants to produce for longer periods. 'Monte Alegre' produced higher number of fruits than 'Campinas', but there was no difference between total production, having 'Campinas' produced larger and heavier fruits.