Open AccessEconomic exploitation of the photosynthetic process: the basis of agricultural production
Author(s) -
P. S. Hammes
Publication year - 1987
Publication title -
suid-afrikaanse tydskrif vir natuurwetenskap en tegnologie/die suid-afrikaanse tydskrif vir natuurwetenskap en tegnologie
Language(s) - English
Resource type - Journals
eISSN - 2222-4173
pISSN - 0254-3486
DOI - 10.4102/satnt.v6i4.963
Subject(s) - photosynthesis , agriculture , cropping , hectare , production (economics) , crop , canopy , environmental science , process (computing) , scale (ratio) , agronomy , agricultural engineering , biology , ecology , botany , computer science , geography , engineering , economics , cartography , macroeconomics , operating system
Crop production is based on the photosynthetic process. Effective cropping systems are only attainable by optimising the size, active duration and effectivity of the photosynthesizing leaf canopy in the field. The extent of photosynthesis on a farm scale is impressive. A typical maize crop on one hectare of land utilises approximately 20 t. carbon dioxide, which is recovered from as much as 60 000 t. of air. Even highly productive cropping systems convert available radiation from the sun into chemical energy with an efficiency of less than 5%. Dramatic increases in crop yields may be attained in future, as has been the case in the past, as the process of photosynthesis is exploited with increasing skill