LEAF SHEATH PHOSPHORUS- SODIUM RATIO AT GRAND GROWTH PERIOD IN SUGARCANE GENETIC STOCKS AND ITS ASSOCIATIONS WITH NUTRIENTS RATIOS, YIELD COMPONENTS, SUCROSE AND YIELD OF CANE AND SUGAR

摘要

Leaf sheath P/Na ratio was determined in 30 sugarcane genetic stocks at grand growth period of 4 to 7 months at monthly intervals. Leaf sheath P/Na ratio between clones, between stages and their interactions were observed significantly at 0.1% level.Leaf sheath P/Na ratio ranged from 1.53 in Co 62399 to 2.80 in Co 740 with the mean of 1.96. Clones Co62399, Co 62101, Co7201, Co 678, Co 1148, Co 853, CoC 671, Co 997, POJ 2878, B 37172 and CoA 7601 recorded low P/Na ratio in leaf sheath, while high leaf sheath P/Na ratio was observed in Co740, Co 7712, CoJ 64, Co 975, h 50-7209, Co 775, Co 617, Co 7704, NCo 310, CP 44101, Co 7717, Co 6304, Co 62175 and Co 419. Leafsheath p/Na ratio decreased with age of the crop from 4.16 at 4 months to 1.43 at 5 months; 1.14 at 6 months to 1.11 at 7 months.