Crescimento e acúmulo de nutrientes em sete cultivares de cana-de-açúcar, AM cana-soca, na região de Coruripe, Alagoas

Abstract

Measures of growth rate and allocation of nutrients during phenological development of the culture of sugarcane allow more accurate analysis of the allocation of nutrients between the parts of cane sugar, contributed to the understanding of the productive capacity of the new cultivars released in different environments from sugarcane plants. In this sense, the objective of this study was to evaluate the growth and accumulation of nutrients in seven cultivars of sugarcane, SP79-1011, RB72454, RB855113, RB867515, RB92579, RB93509 and Co997 in ratoon cane. Determining tillering, stem diameter, plant height, growth rate, leaf area index, mass accumulation green, agricultural productivity, efficiency and accumulation of nutrients. The experiment was conducted at the Farm Progress, owned by Coruripe Plant in the city of Coruripe-AL, from December 2006 to December 2007. The used experimental delineamento was it of blocks casualizados, in outline of subdivided portions, involving cultivate, that they constituted the portions, and evaluation times, as subparcelas. Four repetitions were used with portions presenting 10 m of length for 6,0 m of width, with spacing among arrays of 1,0 m. The collected data were submitted to the variance analysis and the test F, and the averages were compared by the test Scott - Knott to 5% of probability. There was no statistical difference in tillering to the end of the cycle, as evidenced by increased tillering 60 DAC. For height, the cultivars RB92579, RB867515, RB72454 RB93509, and had higher average. The highest growth rates were observed between 90 and 120 DAC, IAF was increased to 180 DAC, no significant difference between the cultivars until the end of the cycle. The cultivar RB867515 highest average green mass in the stem green mass total, and production of sugar. The cultivars showed different behavior with respect to accumulation and nutrient efficiency, in general the highest concentrations were detected at 240 DAC.