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LEAF RESISTANCE IN A GLASSHOUSE TOMATO CROP IN RELATION TO LEAF POSITION AND SOLAR RADIATION
Author(s) -
HURD R. G.
Publication year - 1969
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1969.tb06439.x
Subject(s) - greenhouse , biology , crop , insolation , horticulture , resistance (ecology) , agronomy , climatology , geology
S ummary Leaf resistances were measured in a glasshouse tomato crop, using a mass flow porometer. With plants of different age the sixth to eleventh leaf from the top of the plant had the lowest leaf resistance, both within the stand and at its perimeter. Full leaf expansion occurred at the twelfth to fourteenth leaf. Older leaves had high leaf resistances, especially within the crop. Raising the CO 2 concentration of the glasshouse to approximately 1000 vpm tended to increase leaf resistance but this increase was seldom significant and was sometimes not observed at all. On sunny days, leaf resistances were higher for much of the day than resistances on dull days. This was believed to be due to a form of the midday stomatal closure observed in some plants under high insolation.