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Nano-based soil conditioners eradicate micronutrient deficiency: soil physicochemical properties and plant molecular responses
Environmental Science: Nano  (IF8.131),  Pub Date : 2021-08-06, DOI: 10.1039/d1en00551k
Pallabi Das, Nayanmoni Gogoi, Shuvasree Sarkar, Supriya A. Patil, Nazneen Hussain, Soma Barman, Sanjay Pratihar, Satya Sundar Bhattacharya

Nano-enabled agriculture is a vibrant research area; nonetheless, reports on effective nanofertilizers are rather scant. Hence, we evolved novel, easy, and scalable synthetic routes for environmentally benign Fe-oxalate capped metal oxide (Fe–Mn and Fe–Cu) nanomaterials (OCIMnox and OCICuox) for agricultural use (Patent no. 343590). The materials were systematically characterized through PXRD, FT-IR, HR-SEM, HR-TEM, and XPS analyses, which induced the least toxicity to plants, soil microbes, and earthworms. These materials corrected soil acidity by maintaining the soil pH above 6. Their application increased the surface area by ∼1.5–1.7 fold, water holding capacity by ∼1.4–1.5 fold, and organic C by ∼1.3–1.4 fold in soil as compared to non-nanoscale fertilizers (sulphates and EDTAs of Fe/Mn/Cu). The 10 ppm dose of OCICuox and OCIMnox remarkably enhanced the availability of N (383–385 ppm) and P (75–79 ppm) in soil compared with their non-nanoscale counterparts. Their application in nutrient-fatigued soil could efficiently alleviate Fe, Mn, and Cu deficiency, enhance soil bacterial growth by ∼4–9 fold, and augment siderophore-producing bacteria. Furthermore, oxidative stress factors were minimized in earthworms and plants cultivated in nano-exposed soil. Focused experimentations showed that OCICuox and OCIMnox stabilized soil pH, probably by adjusting the H+ abundance, and optimized nutrient availability by increasing the net-negative charge in soil. Eventually, plant productivity was stimulated through greater N uptake (>6%), 3–10 fold greater up-regulation of expression of vital genes [glutamine synthetase-2 (GS2), glutamate synthase (GOGAT), and nitrate reductase (NR)], and a higher rate of photosynthesis than FeSO4. In conclusion, the innovatively synthesized OCIMnox and OCICuox showed great promise as micronutrient nanofertilizers for future applications.