02083naa a2200193 a 450000100080000000500110000800800410001910000190006024501520007926000090023152014870024065000120172765000170173965300180175665300250177465300290179970000160182877300450184416470322023-04-18       1983    bl uuuu     u00u1 u    #d1 aJOSE, J. J. S.  aTransfer of Mass and Energy in a Cassava Communit (Manihot esculenta Crantz cv. Cubana) 2. CO Enchange in a Savanna Climate.h[electronic resource]  c1983  aThe energy balance aproach was applied to calculate the CO2 flux aboveand within a cassava community, growing during a savanna wet season. Data of the response of CO2 exchange to diurnal changes in the savana evironment were integrated to a grwth analysis of the cassava crop. Thecarbon budget of the entire communit was entire community was calculated at different development stages. Results indicate that CO2 uptake in cassava appears to follow a linear net radiation response curve, dependent on crop age. The maximum net CO2 uptake decreased from 0.195 MJm-2 day-1 at maximum leaf area development (August) to 0.028 MJ m-2 day-1 2 months later. These rates represent 41 and 19 per cent gross assimilation. Data of energy conversion efficiency show that at a maximu m leaf area development, the crop fixed 2.2 and 0.9 per cent R as gross (eg) and net photosynthesis (eg) respectively. As the season proceeded, en decreased to 0.1, whereas eg decreased to 0.7, which indicates that dry matter lost by respiration is one of the determining factors in the seasonal trend of efficiency changes. The comparison of growth characteristics caculated for cv. grwing consecutive years in the sameexperimental site, indicate that yearly variability in dry matter accumulation is due to the wide range of eviromental conditions present during the savana wet season. Operational factors acting depressively on the cassava carbon budget and affecting dry matter production were also analysed.  acassava  amicroclimate  aCarbon budget  aCarbondioxide fluxes  aManihot esculenta Crantz1 aBERRADE, F.  tAnnals of Botanygv.52, p.521-533, 1983.