. Annals of applied biology. Biology, Economic; Biochemistry. G. E. Briggs, F. Kidd, and 0. West 121 annual plant maize has been selected since data are given by Kreusler for this plant grown in four successive years. The first noteworthy result of this analysis is the demonstration of the fact that the growth-rate varies greatly in magnitude at different periods in the life-cycle of a plant such as maize in a perfectly definite manner. Fig. 9 gives the generalised form of the growth-rate curve for maize throughout its life-cycle. Although the broad form is that of a Sach's grand period curve,
. Annals of applied biology. Biology, Economic; Biochemistry. G. E. Briggs, F. Kidd, and 0. West 121 annual plant maize has been selected since data are given by Kreusler for this plant grown in four successive years. The first noteworthy result of this analysis is the demonstration of the fact that the growth-rate varies greatly in magnitude at different periods in the life-cycle of a plant such as maize in a perfectly definite manner. Fig. 9 gives the generalised form of the growth-rate curve for maize throughout its life-cycle. Although the broad form is that of a Sach's grand period curve, it must be noted that it is not a grand period curve, since the grand period curve as defined by Sachs is the curve of the actual increment per unit of time plotted against time and not of relative increment, that is, increment per unit of matter per unit of time plotted against time. On the broad form of the relative growth-rate curve. Fig. 9. Generalised form of the growth-rate curve for maize. for maize are superposed three secondary features, an initial fall, and two subsidiary maxima on the descending limb. In this generalised curve the initial period A-B is the period before the assimilatory organs are able to counterbalance the loss in dry-weight due to respiration, and the rate of growth is consequently negative or nil. The phase B-C corresponds to a phase in morphological develop- ment during which the leaf-area per unit dry-weight increases to a maximum. The phase C-F covers the remainder of the life-cycle of the plant during which the leaf-area per unit dry-weight is continuously decreasing. The subsidiary maxima D and E coincide with the time of the record of the appearance of the male and female flowers respectively. The minima X, Y which precede these maxima, correspond with the earliest stages of flower development, and are possibly due to increased respiration during that Please note that these images are extracted from scanned page images that may hav
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