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THE CROP RESPIRATION RATE OF TULIPS
Author(s) -
REES A. R.
Publication year - 1967
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.1469-8137.1967.tb06003.x
Subject(s) - shading , crop , respiration , linear regression , mathematics , phenology , assimilation (phonology) , environmental science , horticulture , biology , agronomy , statistics , botany , computer science , linguistics , computer graphics (images) , philosophy
S ummary The shading methods developed by Watson and Hayashi (1965) for differentiating the photo‐synthetic and respiratory components of net assimilation rate were used on a field scale for estimating the respiratory losses in a tulip crop. By selecting a period in the plant's life which may be described by a linear regression, variation due to weather in growth rate under different sfiading treatments may be averaged. The mean growth rates under each shading treatment may in turn be fitted by a regression line whose intercept with zero light estimates respiration rate, A value of 20% of gross crop growth rate was arrived at; this agrees closely with previous estimates of dry weight losses in bulb crops before emergence.