Effect of Graded Dose of Potassium on Yield and Juice Quality of Sugarcane Genotypes Grown under Waterlogged Condition in Calcareous Soil
Résumé
A field experiment related was carried out to study the response of graded dose of fertilizers Potassium (K) on different sugarcane genotypes grown under waterlogged condition in calcareous soil during spring season for two consecutive years. The application of graded doses of potassium fertilizer (K 2 O) up to K @120 kg /ha as basal dose was found significantly superior for improving yield attributes and cane yield. The mean cane yield varied significantly and ranged from 54.25-72.49 t/ha among treatments. The highest cane yield was recorded in the treatment receiving K 2 O @ 120 kg/ha which was found at par with treatment receiving K 2 O @ 90 kg/ha and being lowest in control. The mean sugar yield varied (6.35-8.71t/ha) significantly due to application of graded doses of fertilizer K. Among sugarcane genotypes BO153, COP 2061, COLK 94184 and BO 154 were fighting fit under waterlogged condition over BO 91 (Check) in terms of cane yield. The mean value for brix (19.27-20.32%) and pol (16.54-17.67) varied significantly among varieties. However, purity coefficient remains unaffected. The results indicated that the light textured sandy-loam soil rich in free calcium carbonate and low in available K responded well up to application of 200% potassium (120 kg K 2 O /ha) for accelerating productivity of sugarcane, however it was on par with 150% potassium (90 kg K 2 O /ha). The application of K fertilizer @ 90 and 120 kg/ha resulted in the positive balance of available K in post harvest soil. The soil application of basal dose of K 2 O @ 90 kg/ha was found favorable over recommended dose of K 2 O (60 kg/ha) for improving productivity of sugarcane grown under waterlogged condition in calcareous soils of Bihar.
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