By Roger P. Humbert (Auth.)
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Evans called attention to the fact that varieties with more or less erect leaves, such as the Barbados varieties, have root concentrations nearer the stools than varieties with recumbent leaves. Roof systems of ratoon crops Evans 243 , Hardy 316 , Yamasaki 698 and Humbert 3 5 6 have reported the root system of ratoon crops to be less well-developed than that of the plant crop. Evans 243 found that the roots of the plant cane remain active for a considerable period after the crop is harvested. His studies, and studies by Humbert and Yamasaki 354 show that the old root system gradually ceases to function and decays while a completely new root system is formed by the developing shoots of the ratoon crop.
The Marchstarted crop made more efficient use of its sunlight as is seen in Table 8. 41 The differences in yield are explained on the basis of differences in areas of active leaf surfaces available to receive sunlight. During its 'boom stage' of growth, the March-started crop had a full canopy of leaves to take advantage of the high light intensity of the summer months. Das 2l6 studied the effect of climate on yield by growing cane in pots at different localities. The pots were filled with the same soil, planted to the same varieties and handled identically.
It was possible to predict at the end of November the average sugar yield and rendement of Java for the harvest 6 to 10 months later. Wadswoth 663 summarized the irrigation investigations in Hawaii prior to 1950 as the basis for the irrigation of cane lands that have less than 60 inches of annual rainfall. Even with this rainfall, extended periods of drought during the summer and fall months often depress growth. The distribution of rainfall is of very great importance, since excesses falling during the rainy seasons are not only ineffective, but may cause reduced rates of growth where drainage is impeded.