POTASSIUM THIOSULPHATE, UREA AND POTASSIUM NITRATE APPLICATIONS ON VEGETATIVE AND FLORAL GROWTH IN MANGO ‘HADEN’

E. Sergent, F. Leal, M. Anez
The simple effects of potassium thiosulphate, urea and potassium nitrate, the combined effects or urea alternated with potassium nitrate, and thiosulphate alternated with potassium nitrate on vegetative and floral growths were studied in an eight years old mango orchard, planted 4× 4 m. The orchard was located at the Central University of Venezuela, College of Agriculture, Maracay, Aragua State at 450 m. asl, and at 10° 16' N and 67° 36' W., in the Premountain Dry Forest, characterized by a precipitation of about 1000 mm concentrated during May – Oct. The annual mean temperature was about 25°C, and the soils were of the sandy loam types with a neutral pH.

A complete randomized experimental was designed using 32 mango plants, using one plant as the experimental unit with 8 replications. In each plant 12 branches/plant were marked. The treatments were : The check (T1); Urea (0,5%) applied during Jul. and Nov. 1997 alternated with potassium nitrate (60 g/L) during Oct. and Nov. (T2); potassium thiosulphate (4%) during Jul. and Nov., alternated with potassium nitrate (60 g/L) during Oct. and Dec. (T3); and potassium nitrate only (60 g/L) during Jul., Oct. and Dec.(T4)

The largest significant effects on vegetative growth were observed at 130 days after treatments using the T2 treatment; that is, when urea was applied with potassium nitrate, plants grow larger than the checks, and at 210 days the largest vegetative growth was observed with the T3 treatment.

At long range (210 days), significant differences in vegetative and flowering growth were observed in the T3 treatment. The flowering tendency was observed at 130 days in the T4 treatment, and at 210 days, with the T3 treatment.

Sergent, E., Leal, F. and Anez, M. (2000). POTASSIUM THIOSULPHATE, UREA AND POTASSIUM NITRATE APPLICATIONS ON VEGETATIVE AND FLORAL GROWTH IN MANGO ‘HADEN’. Acta Hortic. 509, 653-660
DOI: 10.17660/ActaHortic.2000.509.74
https://doi.org/10.17660/ActaHortic.2000.509.74
flowering time

Acta Horticulturae