Vol. 10, Issue 7 (2021)

Author(s):
B Vajantha, NV Sarala, M Hemanth Kumar, KR Tagore and TM Hemalatha

Abstract:
Response of three sugarcane varieties to five levels of nitrogen fertilizer was studied in a split plot experiment during 2016-17 at Agricultural Research Station, Perumallapalle, ANGRAU, Andhra Pradesh. Sugarcane varieties viz. 2009 T 5, 2009 T 10 and 2003 V 46 were studied for uptake, nutrient use efficiency with 0%, 75%, 100%, 125% and 150% recommended dose of nitrogen at 90 days after planting (DAP), 180 DAP and harvest. Cane yield and yield parameters were recorded at harvest. Results revealed that a significant increase in N uptake by sugarcane with addition of N fertilizers was recorded at all stages of crop growth. The highest mean N uptake was observed in sugarcane fertilized with 150% RDN and the lowest mean N uptake was noticed in plants that did not received N fertilizers. Regarding interaction, application of 150% RDN to 2003 V 46 recorded higher nitrogen uptake at all stages of crop growth and it was at par with 2009 T 10 with 150% RDN and 100% RDN. Higher agronomic efficiency (AE) and physiological efficiency (PE) were observed in 2009 T 10 with 100% RDN. Among sugarcane varieties 2009 T 10 showed higher mean cane yield which is comparable with 2009 T 5. Application of 125% RDN recorded higher mean cane yield and was on par with cane yield obtained from 100% RDN and 150% RDN.