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Synergistic impact of foliar application of nanoparticulate silica on the sustainable productivity of low land rice

D. Gopal,T. Prasad,T. Pradeep,C. Bhargava,Rami Reddy,A. Kumar,R. Naseeruddin,B. P. Girish

Published 2024 in Journal of plant nutrition

ABSTRACT

Abstract Employing nanoscale materials as fertilizers through foliar applications in agriculture has been on the rise and is one of the effective methods for sustainable agriculture. Herein, we investigated the effects of foliar sprays of varied concentrations (@ 100, 200,400, 600, 800, and 1000 ppm) of nanoscale silica on the productivity of rice (field scale) during two rabi seasons (2021–22 and 2022–23). The modified Stober method was used to prepare SiNPs and characterized using particle size analyzer and transmission electron microscopy. The recorded average size of SiNPs was 28.8 nm, with a positive zeta potential (24.6 mV). Pooled results revealed that RDF + foliar spray of SiNPs at 200 ppm increased the culm diameter of rice by 13.6 and 14.3 per cent over silicic acid (@ 4000 ppm) and RDF, respectively. Grain yield (5905 kg ha−1) and straw yield (7517 kg ha−1) were increased by 45.53 and 45.73 per cent over silicic acid (4058 kg ha−1 of grain yield; 5158 kg ha−1 of straw yield) treatments, respectively. Foliar application of SiNPs @ 200 ppm along with RDF significantly increased the protein content of grain (8.82%) and recorded higher net returns of 88506.15 ha−1 with benefit-cost ratio of 2.68 over other treatments tested.

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