Abstract
Summary Nutritional and physiological relationships in germinating cuttings of sugar cane have been studied under conditions where all nutritional requirements of the growing regions were obtained from the cutting. The changes in moisture content, fresh weight, and dry weight which occurred in various morphological regions are discussed, and details are also given of changes in the carbohydrate content, in the nitrogenous fractions, and the phosphorus fractions. The dry weight of the new shoot increased in an approximately linear manner over a 4-week period, indicating that growth was not limited by a diminishing supply of metabolites moving from the cutting. Extrapolation of the curves for sugar contents showed that the concentrations in the shoot and the cutting would have been the same at about 40 days from planting. The results indicated that the transport of sugars from the cutting was limited by a first-order chemical reaction, and not by simple diffusion. Water move- . ment and hormonal relationships during germination and growth have been discussed.
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