SYNTHESIS AND CHARACTERIZATION OF NANO PHOSPHORUS FERTILIZERS AND EVALUATING ITS EFFICACY ON MAIZE PRODUCTIVITY AND PHOSPHORUS USE EFFICIENCY IN ALFISOL
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Date
2023-03-30
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University of Agricultural Sciences, Bangalore
Abstract
Nano phosphorus fertilizers namely hydroxyapatite (NP1), nano rockphosphate (NP2) and carboxy methyl cellulose coated hydroxyapatite (NP3) were synthesized and characterized using PXRD, SEM, FTIR and DLS techniques which confirmed all the synthesized materials having nano material characteristics. Incubation study was conducted for 120 days using the synthesized nano phosphorus materials. The results revealed that saloid bound P, aluminium bound P, iron bound P, calcium bound P and reductant soluble P content decreased while occluded P, organic P and total P content (142.7 to 144.06 mg kg-1) increased with incubation time. To evaluate the efficacy of nano P fertilizer in maize, a field experiment was conducted with eleven treatments replicated t hrice. The results revealed that T9 treatment recorded significantly higher growth parameters, yield attributes and yield (73.59 q ha-1) of maize. The nutrients (macro and micronutrient) content in maize kernel and stover were significantly higher with the application of 75% RDP through SSP along with nano P fertilizers (Either 5% RDP through soil application or 1% RDP through foliar spray or both). Available N, P, K, Ca, Mg and S content in postharvest soil were increased in 100% RPP treatment. Higher PUE (38.20 %) was found in T9 treatment. Higher B:C ratio of 3.03 was recorded in T10 treatment. The content of saloid bound P, aluminium bound P, iron bound P, reductant soluble P and Ca bound P content in soil decreased while content of organic P, occluded P and total P in soil increased with crop growth period in all the treatments which received 75 % RDP through SSP along with nano P fertilizers. From this investigation, it is confirmed that soil application of nano-P @ 5% RDP or foliar application @ 1% RDP or combined application can reduce 25 per cent application of conventional P fertilizers