Spacio-Temporal Fertigation Effects on Growth, Yield and Nutrient Use Efficiency of Elephant Foot Yam (Amorphophallus paeoniifolius)
A field experiment was conducted for two consecutive years during 2013-14 and 2014-15 at the Regional Centre of ICAR-Central Tuber Crops Research Institute, Bhubaneswar, Odisha, India. The experiment was laid out in split plot design with fertigation interval (2, 3 and 4 days) in the main plots and in sub plots the recommended fertilizer (Soluble fertilizer N- P O -K O 120-60-120 kg ha 25 2 ) was split into 30, 40 and 50 doses and 1 applied through drip irrigation. A Check [furrow irrigation where P O 60 kg ha was applied as basal and N- 2 5 1 K O 120-120 kg ha 2 were applied at 1 (40%), 2 (30%) and 3 (30%) month after planting (MAP) to soil] and 1 st nd rd control (no fertilizer) treatments were also included. All the treatments had three replications. The results revealed that the plant height, canopy spread and pseudostem girth at 3 and 5 MAP were the maximum in rd th treatments which received maximum fertigation during that period. Corm yield increased with increase in fertigation interval from 3 to 4 days along with fertilizers application in 40 to 50 split doses. However, the crop did not respond to fertigation beyond 180 days after planting (DAP). The corm yield had significant positive correlation with N, P and K uptake. The fertigation at 4 days interval with application of recommended fertilizers split into 40 doses and fertigation at 3 days interval with application of recommended fertilizers into 50 doses resulted in the maximum corm yield, nutrient (N, P and K) uptake and use efficiency (agronomic efficiency, recovery efficiency and partial factor productivity) in elephant foot yam.