The circulatory system of the sugar-cane plant

Translocation of 14C in the Sugarcane Plant During the Day and Night

“…Experiments upon translocation of 'IC during the day and the night have been conducted since 1950 (5,6,13), long before any effect of intensity or color of illuimination was detected. The results are reported now to show that translocation in the sugarcane plant is more rapid by day than by night; and to examine the possible causes of this difference in view of the findings with detached blades on the effects of intensitv and quality of light.…”

“…The methods by which the CO., respired by roots was collected, prepared and couintecl have already beeni described (6 Figure 1 (curve A) shows that the percentage rate of loss was greater during the day than the night, even during the second day. Similar differences were obtained in several other experiments and were partictularly conspictuouis when the roots were cold (13).…”

Foliar application of phosphorus compounds

“…Burr et al (1958) found that the lower leaf surface of sugar cane absorbs phosphorus more efficiently than the upper. Ursulenko (1958) noted that the uptake of by the lower surface of apple leaves from a solution was more intense and lasted longer than the uptake by the upper surface of the leaves.…”

“…Van den Hende et al (i960) and Van Cleemput and Van den Hende (I965) developed a technique to apply known quantities of phosphorus so to study its absorption by means of wetting pieces of tissue paper on the leaf surface. 32 Burr et al (1956Burr et al ( , 1958 at the rate of 800 liters per hectare. Yakushkina (i960) reported that spraying two or three times with NH^NO^ or superphosphate during the vegetative period accelerated growth but did not always increase root yield.…”

Foliar fertilization of corn during the grain-filling period

“…Burr et al (1958) have shown that the entire phosphate requirement of sugar cane may be administered by foliar ap plication, and 95^ of the urea applied as a spray to sugar cane was interrupted by the foliage Takahashi, 1955)» McCall andDavis (1953) concluded that foliar applications were more efficient than soil applications based on pounds of increase and yield per pound of urea-N applied to celery, onions, potatoes and sugar beets. There seems little doubt that where problems of soil fixation exist, foliar applica tions of nutrients constitute the most efficient method of fertilizer "placement", and with plants of sufficient leaf area, foliar feeding with all the essential elements can make a significant contribution toward the total nutrient require ment of such plants.…”