. Carnegie Institution of Washington publication. Reproduction. 71 obvious that in the last station reproduction by seedlings is relatively very good, especially as the counts were made at the close of a long drought. A condition such as this might, in the light of table 25, be expected to lead to a good stand of guayule. From a consideration of the curves based upon table 25, some further points of interest are discovered. There is a large falling off in numbers of plants between the average weight of about 4 and 12 ounces. This, as seen in the curves on pages 87 and 88, is the period, approx
. Carnegie Institution of Washington publication. Reproduction. 71 obvious that in the last station reproduction by seedlings is relatively very good, especially as the counts were made at the close of a long drought. A condition such as this might, in the light of table 25, be expected to lead to a good stand of guayule. From a consideration of the curves based upon table 25, some further points of interest are discovered. There is a large falling off in numbers of plants between the average weight of about 4 and 12 ounces. This, as seen in the curves on pages 87 and 88, is the period, approximately, of maximum rate of growth, viz, between 8 to 10 and 13 to 15 years of age, during which time there is a loss of total weight of about one-fourth to one-third, as nearly as we may calcu- late. From the nature of the conditions, many of which are undetermi- nable, such calculations can be only loosely approximate,but it can hardly be doubted that, if the rate of reproduction by seed from plants, say from 6 to 8 ounces in weight, can be depended upon quantitatively as. Fig. 2-3 POUNDS -The relative numbers of various-sized plants on different quadrats. The at the ends of curves refer to the tables corresponding. 4- numbers indicated in the table under consideration, it is an economic loss to allow plants larger than these to remain. From this point of view alone it may not pay to allow the plants to remain after the age indicated by the weight of 6 to 8 ounces has been attained, as the numbers which die off are great enough to cause a considerable falling off of total weight. The data show also that the initial monetary return from a harvest- ing of guayule may be as great or greater from a stand of a few large individuals, but the areas with large numbers of smaller plants give promise of future returns. An important desideratum is to determine how to improve these conditions. Here, let us say, is a good field of guayule, as regards first returns. The bulk of the we
Size: 1954px × 1279px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1910, bookyear1911
