Acidity and gas interchange in cacti by Herbert M. Richards PDF

By Herbert M. Richards

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Graph showing acidity of Mammittaria grahami in comparison with diurnal temperature curve. c. of decinormal alkali per gram fresh weight. = temperature. = acidity. Attention has already been called in the chapter on experimental methods to the differences of acidity in shoots of unequal ages. The young growing joints are distinctly more acid, on the average, than the mature ones, both as to the Shoots of the total amount present and as to the concentration of the juice. age of 1 or 2 years are hardly separable on the basis of their acidity, but at 3 years there is some decline in total acidity (table 22).

It is not at all impossible, is also probably due to the more active oxidation. also, that the acid destruction may be favored by the more delicate nature of the young epidermis, which would allow of greater penetration of the sun's rays and thus bring about more rapid deacidification. The elongation of the young joints after the bud begins to develop is exceedingly rapid if the conditions be suitable, but after the first season those of Opuntia versicolor at least do not grow greatly in length.

The results of these two series (table 37) are consistent both with the previously described respiration effect and with after injury there is oscillations, rises to its the acidity determinations (table 21). Averaging the results in this case the maximum is at 24 hours after injury, at which time the acidity is lowest. As the healing processes set in and the carbon dioxide decreases in amount there is evidence of a rise in acidity.

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Acidity and gas interchange in cacti by Herbert M. Richards


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