. Citrus culture in Porto Rico / by Henry C. Henricksen. Citrus fruits Puerto Rico; Fruit-culture Puerto Rico. CITRUS CULTURE IN PORTO RICO 23 Decay may set m before the scars heal, continue into the trunk, and eventually cause the death of the tree. The root growth of such trees is frequently too slow to permit the sap to reach the leaves rapidly enough to prevent wilting, especially when the air is dry and moving fast. The value of wind protection for young trees is mainly that of maintaining a humid atmosphere. With the checking of excessive air movement the tree may survive under condition
. Citrus culture in Porto Rico / by Henry C. Henricksen. Citrus fruits Puerto Rico; Fruit-culture Puerto Rico. CITRUS CULTURE IN PORTO RICO 23 Decay may set m before the scars heal, continue into the trunk, and eventually cause the death of the tree. The root growth of such trees is frequently too slow to permit the sap to reach the leaves rapidly enough to prevent wilting, especially when the air is dry and moving fast. The value of wind protection for young trees is mainly that of maintaining a humid atmosphere. With the checking of excessive air movement the tree may survive under conditions which would make growth impossible without wind protection. The checking of excessive air movement also promotes the growth of beneficial Figure 14.—Two-year-old tree which was planted on mound. The mound has practically disappeared and the crown roots are exposed This was noted in the groves first planted on the island. Most of the trees in these groves were severely attacked by the purple scale, which was not kept in check by beneficial fungi until after wind pro- tection was established. Nowadays newly planted trees which are similarly exposed do not suffer from scale to such an extent, because the beneficial fungi, especially the red-headed fungus (Sphcerostilbe coccophila), seem to be able to maintain themselves under more ad- verse conditions than formerly. Planting tall-growing plants for cover crops among the young trees has nevertheless proved to be a most economical and time-saving practice in the establishment of citrus plantations. Under this practice cultivation during the first few years consists in plowing under as soon as it matures each crop of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Henricksen, H. C. (Henrick Christian), 1869-. Porto Rico Agricultural Experiment Station
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