Effect of nano-scale boron fertilizer on foliar and rhizosphere soil microflora, tuber yield and quality in potato (Solanum tuberosum L.)
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Date
2022
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Punjab Agricultural University, Ludhiana
Abstract
The present work aimed to study the effect of foliar application of the synthesized boron nanoparticles and bulk precursors on soil and foliar microflora and on yield and quality of potato tubers. Three different types of boron nanoparticles were synthesized i.e., calcium borate, boron nitride and boron tri-oxide nanoparticles. On UV- Vis absorption spectroscopy analysis, the synthesized boron nanoparticles exhibited characteristic absorption peaks at 214 nm (Ca B NPs), 200 nm (BN NPs) and 200-205 nm (B2O3 NPs). The FTIR analysis of these nanoparticles depicted the presence of the borate network and boron-oxygen functional groups. The microbial cell toxicity of the synthesized nanoparticles was evaluated through poison food agar and broth supplementation in vitro studies against plant beneficial soil bacteria and no zones of inhibition were observed. Further, on evaluation of the antioxidant properties of the nano-boron particles significant variations were among the three different types of nanoparticles. In broth supplementation study, the viable cell count varied significantly for these different types of nanoparticles. The total protein content also exhibited
a significant effect for BN NPs and B2O3 NPs except for Ca B NPs. The acid production as determined by TLC analysis showed enhanced formation of indole acetic acid in Azotobacter (Rf value: 0.65). A field experiment was performed with the CaB NPs to ascertain effect of foliar application on cracking and tuber yield in two potato accessions. The nano boron fertilization exhibited non-significant effect on all the soil parameters. The soil dehydrogenase activity showed significant variations however both the varieties, treatment and different concentrations were at par with each other for the urease activity. A significant effect on the shoot fresh weight (variety specific). The variety and various boron source treatments at different concentrations exhibited a non-significant effect on all the photosynthetic parameters except for the anthocyanin content. Non-significant difference was recorded for the yield and yield attributing parameters such as tuber number, diameter and fresh weight. Further, nonsignificant results were obtained for all the tuber quality parameters. Higher N and B content of the shoot was recorded at 50 mg L-1 and higher N and B content in the tuber was recorded at 100 mg L-1 nano boron. The results reflect the equivalence for bulk and nano-sources of boron with a numerical increase in the observed traits by application of nano-boron particles.
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Dhiman, Diksha (2022). Effect of nano-scale boron fertilizer on foliar and rhizosphere soil microflora, tuber yield and quality in potato (Solanum tuberosum L.) (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.