ÍNDICE DE ÁREA FOLIAR EM CANA-DE-AÇÚCAR SOB DIFERENTES NÍVEIS DE IRRIGAÇÃO E ZINCO NA PARAÍBA

Abstract

the research was installed in an experimental area (latitude 6º54'59,88"S, longitude 35º09'17,86"O and altitude of 121,00 m) of Capim II Farm, located in the Municipal of Capim/PB, with objective of evaluating the behavior of the culture of the sugarcane (Saccharum spp.), variety SP 79 1011, as for Leaf Area Index submitted to two factors: sheets of irrigation water and manuring levels with zinc. The experimental design consisted of randomizered blocks (DRB), with three repetitions in factorial outline 5 x 5 analyzed jointly. The irrigation sheets were: without irrigation, 25, 50, 75 and 100% of the Etc considering the respective effective precipitations. The levels of zinc were 0, 1, 2, 3 and 4 kg ha-1. The irrigation equipment used in the research was of the type central pivot fasten. The irrigation sheets influenced the area index significantly to foliate along the cultivation period. The maximum leaf area index of sugarcane it happens to the five months of age; at the end of the year of cultivation the variety SP 79 1011 of sugarcane answered, in a significant way, to the sheets of irrigation water. The differences in relation to the cane irrigated with 100% of the ETc they are respectively: 41,12; 23,37; 22,07 and 24,67%.