. Journal of Agricultural Research. Of the Leaves, which was i to 3 or i to 4 and talora anche 464 Journal of Agricultural Research voi. xxv, no. Più piccolo nelle piante in rapida crescita della Serie IV, era i to 2 o più grande nelle piante in lenta crescita della Serie V, Per illustrare queste differenti caratteristiche delle piante delle serie IV e V ed anche le estreme variazioni che si riscontrano nell'acidità delle piante dello stesso ceppo, alcune curve di titolazione ottenute con le piante di No. 326 sono riportati in figura i. I dati relativi al fusto e alle foglie di una piantumea di acidità inferiore alla media della Serie IV sono riportati in grafico

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. Journal of Agricultural Research. of the leaves, which was i to 3 or i to 4 and sometimes even 464 Journal of Agricultural Research voi. xxv, no. smaller in the rapidly-growing plants of Series IV, was i to 2 or greaterin the slow-growing plants of Series V, To illustrate these differing characteristics of the plants of Series IVand V and also the extreme variations which are found in the acidity ofplants of the same strain, some titration curves obtained with plants ofNo. 326 are given in figure i. The data for stalk and leaves of a plantof less than average acidity from Series IV are plotted alongside those ofa plant of more than average acidity from Series V. The slope of the curve representing the stalks of the vigorous plantsis steeper than that of the slow-growing ones and shows that the titratableacidity of the latter is more than three times that of the former. Thecurves representing the leaf acidities show a similar relation. The curvefor the stalk juice of the poor plant starts below but crosses that of the. ^ ^6 7 S 3 /O // Cc. yho /Vo O/-/ ac/<:/eci /o /Oca. •^u/ae. /£ Fig. I.—Electrometric titration curves of leaf and stalk juices of Reid Yellow Dent corn from vigorousplants (Series IV) from tbe greenhouse and stunted plants (Seiies V) from the field. leaves, a relation shown by the curves for the leaves and stalk of everyplant in Series V, but for none of the plants of the vigorous series. The acidity data for strain No. 150 are not included in Table V because, in both Series IV and V, these plants appeared diseased and not compar-able with the others. The leaves were crinkled, spotted, and dead at thetips, with the lower leaves prematurely dead. In Series IV, both the hy-drogen-ion and titratable-acid concentrations in these leaves were defi-nitely higher than in any others, being Pu 5.26 and 12.5 cc. (NaOH), respective, while the corresponding values for the stalks of the sameplants were lower than the average concentration, being Pa 5.66 and

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• bookcentury1900
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