1297,98 WL 1357,88 WL 2137,92 WL 1029, NCO 310 and 57 NG 136 showed lesser resistance to inversion of sucrose as compared to other clones. Hence inversion of sucrose is a limiting factor for high sucrose accumulation under waterlogging. ' P
Efforts were on for more than a decade t o develop waterlogging tolerant clones at SBI RC, Kannur by using waterlogging resistant parents. Co 99006 is one of the recent varieties developed for waterlogging condition. The clones identified from this study are: 99 WL 629,91 WL 552,92 WL 1029, 98 WL 1357,97 WL 633 and 99 WL 379.
7
10th '
n Months
., D .,
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,
Fig. 2. Changes in juice quality under waterlogging stress
Impact of waterlogging st yield and yield components Waterlogging caused 22.4O0/0, reduction in number of millable canes, 45.60 9b reduction in single canes weight, 30.00째/o reduction in cane length, 15.90% reduction in internodal length, 17.80% reduction in cane t h i h e s s and 50.1% reduction in cane yield (Fig. 3). The yield and yield components was comparatively better in 91 WL 552, 91 WL 629,92 WL 1029,93 WL 1297,97 WL 633 and 98 WL 1357 showing their resistance to waterlogging stress.
Varieties for waterlogging mistance
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Variety Co 62175 is highly adapted to excess moisture stress condition. Some of the recent varieties, which can be grown under waterlogging conditions are Co 8231, Co 8232, Co 8145, CoSi 86071 and CoSi 776, Co 8371, 93A4, 93Al1, 93A 145, 93A21, BO 91, Co 87263, Co 87268, CoTl8201and CoTl 88322.
Fig.3. NMC & Yield of sugarcane clones in response to .waterlogging stress - r_ . ..': . J r p
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)i16nig&=nfbkactiCeS planting ~
~
~
Crop planted in first week of February gave higher yield than the crop planted in March or April. Autumn planting is more beneficial than spring planting as by the time flooding starts, autumn crop would have attained sufficient vigour and height. It is suggested that setts should be
planted deep and earthing up should be done as the crop grows.
Deep drench system of planting could be adopted for early drought and late waterlogged condition to improve yield of both plant and ratoon crops.
Use of ~ o l ~ b a single g bud settlings or single bud settlings raised in nursery may be planted after water
h