Author(s):

Navnit Kumar and SS Pandey

Abstract: A field experiment was conducted during 2015–16, to find out the response of three sugarcane (Saccharum spp. hybrid complex) genotypes to levels of nitrogen at Sugarcane Research Institute, Pusa, Bihar. Among the genotypes, ‘CoP 11437’ showed the highest germination (37.9%), plant population (1, 76,700/ha), dry matter accumulation (38.2 t/ha) and millable canes (1, 22,300/ha) followed by ‘CoP 11438’. Similarly, genotype, ‘CoP 14437’ also recorded significantly higher cane yield (103.7 t/ha) and sugar yield (13.1 t/ha) followed by ‘CoP 11438’ (80.2 t/ha). The maximum pol (18.37%) in juice was obtained with ‘CoP 14438’, which was statistically similar that obtained with ‘CoP 14437’ (18.16%). Genotype ‘CoP 14437’ gave the highest gross returns (2, 64,400/ha), net returns (`1, 69,600/ha), benefit: cost ratio (1.80) and N uptake (284.9 kg/ha). Application of 100% recommended dose of nitrogen significantly increased dry matter accumulation and cane yield; however, plant population and millable canes were significantly increased up to 125% recommended dose of nitrogen. Application of 75% recommended dose of nitrogen being at par with 100% recommended dose of nitrogen resulted in significantly higher pol (18.25%) content in juice over 125% recommended dose of nitrogen. Significantly maximum values of net returns (` 1, 50,100/ha), benefit: cost ratio (1.58) and N uptake (261.4 kg/ha) were recorded at 125% recommended dose of nitrogen. However, significantly higher values of available N (236 kg/ha) was obtained with 100% recommended dose of nitrogen. It was therefore inferred that genotype CoP 14437 along with 125% recommended dose of nitrogen to sugarcane was the most profitable options.

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