Effect of nitrogen application on juice quality and sugar yield in sugarcane varieties

A field experiment was conducted at Lakhaoti during 1993-94 and 1994-95 to assess the impact of nitrogen levels (0,60, 120, and 180 kg/ha) on juice qu ality and sugar yield of some promising sugarcane genotypes ('Co 1148', 'Co S 767', 'CoS 687' and 'CoJ 64') planted in spring season. Genotypes differe d significantly in terms of per cent extraction brix, sucrose, purity, avai lable sugars, reducing sugars, millable canes, cane yield, and commercial c ane sugar (CCS) yield. 'CoJ 64' had the best quality, followed by 'CoJ 687' , 'Co 1148' and 'CoS 767'. However, the highest sugar yield was recorded wi th 'Co 1148'. Nitrogen had an adverse effect on juice-quality attributes. T he highest commercial cane sugar yield was obtained with 120 kg N/ha and it declined by 8.2% with further higher dose of 180 kg/ha.