Abstract
SUMMARY. In this chapter we have continued our analysis of the results of the experiments on the growth of maize carried out by Kreusler and his co‐workers. The rate of growth has been expressed per unit leaf‐area instead of per unit dry‐weight as in the last chapter. The term “Unit Leaf Rate” is used for the weekly rate of increase of dry‐weight in mgs. per sq. cm. The Unit Leaf Rate, instead of undergoing a perfectly definite type of variation, as does the Relative Growth Rate, fluctuates about a mean value. The larger fluctuations which occur in the values for Unit Leaf Rate calculated for the later phases of the life‐cycle have been attributed mainly to sampling errors. Correlations between Unit Leaf Rate and various environmental factors have been determined. The general evidence is that the Unit Leaf Rate is correlated more closely with temperature than with any of the other environmental factors. By allowing for respiration on the basis of our own experimental results values for the real assimilation were arrived at. These also show a closer correlation with temperature than with light. The values for assimilation determined from the Unit Leaf Rate are of a lower order than those determined by the “half‐leaf” method, but much higher than those determined by the “gasometric” method. Finally, the authors wish to express their indebtedness to Dr F. F. Blackmail for his stimulating criticism and help in this and in the previous chapter.
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Claims 6
Claim · model-written summary
Maize unit leaf rate fluctuated around a mean.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“experiments on the growth of maize”
e1“The Unit Leaf Rate, instead of undergoing a perfectly definite type of variation, as does the Relative Growth Rate, fluctuates about a mean value”
Claim · model-written summary
Larger late-life-cycle fluctuations in maize unit leaf rate were attributed mainly to sampling errors.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“experiments on the growth of maize”
e1“The larger fluctuations which occur in the values for Unit Leaf Rate calculated for the later phases of the life‐cycle have been attributed mainly to sampling errors”
Claim · model-written summary
Maize unit leaf rate correlated more closely with temperature than with other environmental factors.
- Outcome
- Unit Leaf Ratee1
- Direction
- more closelye1
- Comparator
- other environmental factorse1
- Setting
- temperaturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“experiments on the growth of maize”
e1“the Unit Leaf Rate is correlated more closely with temperature than with any of the other environmental factors”
Claim · model-written summary
Estimated real assimilation correlated more closely with temperature than with light.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“experiments on the growth of maize”
e1“values for the real assimilation were arrived at. These also show a closer correlation with temperature than with light”
Claim · model-written summary
Assimilation estimated from unit leaf rate was lower than by the half-leaf method.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“experiments on the growth of maize”
e1“The values for assimilation determined from the Unit Leaf Rate are of a lower order than those determined by the “half‐leaf” method”
Claim · model-written summary
Assimilation estimated from unit leaf rate was higher than by the gasometric method.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“experiments on the growth of maize”
e1“much higher than those determined by the “gasometric” method”
e2“The values for assimilation determined from the Unit Leaf Rate”