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STUDIES ON PRODUCTIVITY OF COFFEE III‐DIFFERENCES IN PHOTOSYNTHESIS BETWEEN FOUR VARIETIES OF COFFEE
Author(s) -
Nunes M. A.,
Bierhuizen J. F.,
Ploegman C.
Publication year - 1969
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1969.tb00604.x
Subject(s) - coffea arabica , coffea canephora , photosynthesis , coffea , horticulture , dry matter , biology , productivity , botany , agronomy , economics , macroeconomics
SUMMARY Net photosynthesis was measured in plants of four coffee varieties (two of Coffea arabica and two of Coffea canephora(robusta) ) at several temperature and light conditions. It was observed that light saturation occurred at approximately 0.11 cal cm –2 min –1 , whereas net photosynthesis decreased with increasing temperatures above 20 °C (approximately 7% per °C). The arabica selection S288–23 showed the highest net photosynthesis and the lowest percentual decrease with excessive temperatures. The results are in good agreement with field experiments of plants of the same groups. The method used, may be applied for a comparison of potential dry matter production between varieties under different environmental conditions.