EFFECTS OF APPLICATION OF PLANT GROWTH REGULATORS ON CULTURE OF THE CURLY LETTUCE (Lactuca sativa var. Veronica) AND AMERICAN LETTUCE (Lactuca sativa var. Lucy Brow)

Abstract

The lettuce is a vegetable leafy of larger commercial value cultivated in Brazil, for about 75 commercial varieties. Plant of tranquilizing properties is considered, with high vitamin tenor A, B and C, besides calcium, match, potassium and others mine. The Present work had as objective evaluates the agronomic efficiency of the plant growth regultors on the physiologic and productive aspects of the culture of the lettuce curly variety “Veronica” and lettuce American variety “Lucy Brow”. The rehearsal was developed in commercial property of vegetables leafy, located in the municipal district of Fernão, state of São Paulo, in a completely randomized, with four replication and sixteen plants for plot, totaling six treatments, T1 - control, T2 - 75ml.100L-1, T3 - 100ml.100L-1, T4 - 125ml.100L-1, T5 - 150ml.100L-1, T6 - 175ml.100L-1 of plant growth regulator stimulate. The evaluation parameters were accomplished during the crop about the following determinations: Chlorophyll rates, diameter of the heads of lettuce, medium weight of the feet, number of leaves and incidence of it burns of boards. In a “Veronica”, significant increase was observed in a vegetative development and medium weight of the plants specifically in dosage of 150ml.100L-1, regarding elevation of the chlorophyll rates the American variety “Lucy Brow” presented larger rates in a concentration of 100ml.L-1 of Stimulate.