Abstract
Aim: To determine the optimum level of phosphorus for higher yield and phosphorus uptake by groundnut at different planting densities. Methodology: A field experiment was laid out in randomized block design with factorial concept during Rabi seaon 2019-20 to study the phosphorus uptake by groundnut under high density plantation (22.5 x 10 cm - 4.44 lakh ha-1; 20 x 7.5 cm - 6.66 lakh ha-1; 22.5 x 5 cm - 8.88 lakh ha-1 with graded levels of phosphorus (25, 37.5, 50 and 62.5 kg P2O5 ha-1). Results: The present study revealed that 4.44 lakh ha-1 registered lower phosphorus uptake and application of 62.5 kg P2O5 ha-1 recorded a higher uptake of phosphorus and soil available nitrogen, phosphorus, and potassium. Interaction was significant only in influencing pod yield. Higher pod yield was recorded in the population density of 4.44 lakh ha-1 applied along with 50 kg P2O5 ha-1, followed by 6.66 lakh ha-1 applied with 62.5 kg P2O5 ha-1. Interpretation: The results indicate that for better nutrient uptake and higher pod yield of groundnut, farmers should prefer a planting density of 6.66 lakh ha-1 with an application of 62.5 kg P2O5 ha-1. Key words: Groundnut, Nutrient uptake, Plant density, Phosphorus, Pod yield