Características físicas e químicas de frutos de goiabeira em função de níveis de nitrogênio e lâminas de irrigação.

Abstract

The objective of this study was to characterize the guava fruits, Paluma specime, through the physical, physical-chemistries and chemistries determinations as a function of irrigation depth and Nitrogen manuring. The experiment was carried out in the Veludo's Experimental Station, EMEPA, located in Itaporanga, Paraíba State. It was utilized an experimental design in randomized blocks, in factorial scheme (4 x 4) with four repetitions.The Nitrogen doses of 50, 100, 150, 200 kg ha"1 and irrigation depth L I = 1144 mm, L2 = 1465 mm, L3 = 1785 mm e L4 = 2106 mm were tested. The fruit equatorial diameter was influenced apart by the irrigation depths, with an increase of 27,1%. The doses of Nitrogen (200 kg ha"1) influenced the médium weight of fruits and the longitudinal and equatorial diameter. The largest values of médium weight of fruits (kg) and the commercial productivity (ha"1) were obtained with the combinations of 200 kg ha"1 of nitrogen. The °Brix° of the guava fruit was influenced by the water quantity applied decreasing in proportion the irrigation depth increased, the same it was verified with the Nitrogen doses. The médium weight of fruits over 200 g was obtained when it was applied a dose larger than 100 kg ha"'de N and in each increment of 50 kg ha"1 of Nitrogen, it had an increase of 13.3% in the médium weight of the fruit. Just the nitrogen dose interfered in pH of fruit, which varied from 3.37 to 4.40. In general, in this study, the dose of 150 kg ha"1 of Nitrogen and the irrigation depth of 1785 mm presented the better results.