Vol. 11, Issue 11 (2022)

Author(s):
Rashmi CM, Prakash SS, Basavaraj PK, Krishnamurthy R, Yogananda SB, Bhavani P and Giridhar BN

Abstract:
A field experiment was conducted during Kharif 2021 in farmer’s field at Halavarthy village, Davanagere (Dst.), Karnataka, which comes under Central Dry Zone of Karnataka (Zone 4), using RCBD design with eleven treatments which were replicated three times to evaluate the impact of three different nano phosphorus fertilizers on uptake of N, P and K by maize. Treatments included T₁: Absolute control, T₂: 100% recommended package of practice (RPP), T₃ to T₅: 75% RDP (75% recommended dose of P) through SSP + 5% RDP through NP1(hydroxyapatite nano fertilizer), NP2 (nano rock phosphate) and NP3 (hydroxyapatite nanoparticles coated with CMC), T₆ to T₈ : 75% RDP + 1% RDP through foliar spray of NP1,NP2 and NP3, T₉ to T₁₁: 75% RDP + 5% RDP through soil application of NP1, NP2 and NP3, and 1% RDP through foliar spray of NP1, NP2 and NP3, respectively. Results revealed that application of phosphorus in nano form had significant effect on uptake of nutrients in maize. Treatment with 75% RDP through SSP + 5% RDP through soil application of NP1 + 1% RDP through foliar spray of NP1 recorded higher values of total uptake of N (166.34 kg ha^-1), P (32.38 kg ha^-1) and K (183.45 kg ha^-1), by maize compared to rest of the treatments.