Evaluation of Sugarcane Mid-late Clones under Waterlogging conditions
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Date
2017
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Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur)
Abstract
A study was conducted with sixteen genotypes received from Sugarcane Research Institute, D.R.P.C.A.U., Pusa, Samastipur, Bihar. The experiment was conducted in Randomized Block Design with three replications during spring season 2016 in paddy block, to evaluate the midlate sugarcane clones for waterlogging tolerance. Analysis of variance revealed highly significant differences among the genotypes for all the characters under study in waterlogging condition. The numerical values of phenotypic variation were higher than their genotypic counterpart for all the characters. Among quality characters viz. brix, pol, purity and CCS percentage at 10 and 12 months stage respectively had low GCV and PCV values indicating the presence of limited variability for these traits. Moderate to high heritability estimates were noticed for almost all the characters under study suggesting that selection of clones for these characters will be effective. Out of all twenty-five traits, high heritability with moderate GCV and PCV coupled with high genetic advance observed by sugar yield (CCS t/ha), cane yield (t/ha), leaf area index before waterlogging, leaf area index at 30 days after waterlogging and leaf area index at 60 days after waterlogging indicating the suitability of these traits for selection.
Cane yield (t/ha) had significant and positive correlation with germination percentage at 45 DAP, number of shoots at 120 DAP (000/ha), number of shoots at 240 DAP (000/ha), number of millable canes at harvest (000/ha), sugar yield (t/ha), plant height at 240 DAP, plant height at 360 DAP, single cane weight, cane diameter at harvest leaf area index before waterlogging, leaf area index 30 days after waterlogging, leaf area index 60 days after waterlogging, number of fully emerged leaves at 30 days after waterlogging and number of fully emerged leaves at 60 days after waterlogging. Thus, these traits play a greater role as important contributing characters for higher cane yield. Highest positive direct effect on cane yield was exerted by pol percent at 12 months stage, sugar yield, brix percentage at 10 months stage, single cane weight and purity percentage at 10 months stage at phenotypic level, hence these traits can be used for clonal selection programme on sugarcane for sub-tropical regions. Ranking of clones based on selection index and three other criteria revealed that CoP2061 is the most suitable clone among the clones studied for waterlogging condition. Other clones which can withstand waterlogging situation are BO154 (check), CoP15439 and BO155.
From the result and their conclusive interpretation, it can safely concluded that germination percentage at 45 DAP, number of shoots at 120 DAP (000/ha), number of millable cane at harvest (000/ha), sugar yield (CCS t/ha), cane yield, brix percentage at 10 months stage, single cane weight, leaf area index before waterlogging, after 30 and 60 days after waterlogging can be associated together in a positive direction towards an ultimate aim of developing high yielding sugarcane clones combining high sucrose for waterlogging condition.
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