Influence of three sowing dates on the biological productivity of sorghum cultivation (Sorghum bicolor L. Moench)
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Abstract
In order to evaluate the influence of three planting dates on growth and supply demand relationship in the cultivation of sorghum, the work was developed at the National Institute of Agricultural Sciences (INCA). Three planting dates were studied: November 2008, June 2009 and July 2009, using a density of 15 kg ha-1. plants destructive samplings were made every 15 days after emergence to harvest, determining the dry mass of organs, adjusting the data to a polynomial exponential function of the second degree, “x” was the days after the emergency “y” variable in question. from the regression equations the net assimilation rate (NAR) and leaf area ratio (RAF) were calculated. The relationship between the power source and power demand was also calculated and found to greater efficiency in the use of radiation leads to higher maximum in (NAR) and the potential between the supply and demand organs and therefore a greater accumulation of biomass in next time to physiological maturity, standing out in this case the dates of June and July 2009 which expressed more efficient in relation to growth rates assessed behavior, resulting in these higher yields.
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