Growth and photosynthesis of sugarcane based on biometric and meteorological variables

Revista Brasileira de Engenharia Agrícola e Ambiental

Lyra, Gustavo B.³  Ferreira Junior, Ricardo A.¹  Teodoro, Iêdo¹  Souza, José L. de⁴  Porfirio, Anthony C. S.²  Santos, Marcos A. dos¹ 

[1] CECA/UFAL, Rio Largo;DSA/CPTEC/INPE, Cachoeira Paulista;IF/DCA/UFRRJ, Seropedica;ICAT/UFAL, Maceió

关键词: photosynthetic radiation;    growth models;    Saccharum spp;   

DOI  :  10.1590/S1415-43662012001100012

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

Sugarcane growthcan be obtained by biophysical models in which gross photosynthesis (GP) isobtained as a function of solar radiation. This work aims to evaluate sugarcanevarieties under irrigation in relation to intercepted photosynthetic activeradiation (PARint) and the estimated accumulative GP. To achieve that, a studywas conducted at the Federal University of Alagoas during 2008 and 2009, withRB sugarcane varieties. Biometric measurements, production variables and meteorologicalelements were made. The intercepted photosynthetic irradiance (PAR) was obtainedby the difference between PAR and transmitted PAR (PART), which was determinedby Beer's Law. The daily GP was estimated numerically by the trapezoidal approach.The production variables had correlations with accumulated PARint and accumulatedGP during the crop cycle. The average global solar radiation in the region forrainy season (May-August) was 14.9 MJ m-2. The variety RB92579 had the highestproduction variables as well as higher intercepted PAR and accumulated GP inthe cycle due to its greater capacity for regrowth and energy conversion inphotoassimilate.

【 授权许可】

CC BY-NC