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- Title
PHYTO-AVAILABILITY OF PHOSPHORUS TO Lactuca sativa IN RESPONSE TO SOIL APPLIED TiO<sub>2</sub> NANOPARTICLES.
- Authors
Hanif, Hina Umber; Arshad, Muhammad; Ali, Muhammad Arif; Ahmed, Niaz; Qazi, Ishtiaq Ahmed
- Abstract
Phytoavailability of phosphorus (P) in soil remains a major issue for crop production particularly in developing world. The objective of present work was to study the effects of engineered TiO2 nanoparticles (nano-TiO2) on phytoavailability of P and growth response of Lactuca sativa (Lettuce). Suspensions of 0, 25, 50, 75 and 100 mg kg-1 of nano-TiO2 having size less than 65 nm were applied to a sandy loam soil. The concentration of phytoavailable P in soil increased up to 56% after 72 h incubation at room temperature (25°C) in Petri dishes when 100 mg nano-TiO2 kg-1 soil was applied. Similar trends were also observed for phytoavailable P in the soil after culturing L. sativa plants onto it for 14 days. Shoot and root lengths were increased up to 49% and 62% respectively at 100 mg kg-1 of soil applied nano-TiO2, as compared to the control treatment. Shoot and root P concentrations were increased up to 36 and 175% respectively at 100 mg kg-1 of nano-TiO2, as compared to the control. P uptake per plant was five-folds with reference to the control. L. sativa significantly acidified its rhizosphere. This innovative study provides an important base line to further investigate the detailed mechanisms involved in improved P uptake and plant growth in response to application of engineered nanoparticles in the field.
- Subjects
PHOSPHORUS in soils; COMPOSITION of lettuce; TITANIUM dioxide nanoparticles; SANDY loam soils; NUTRIENT uptake; PLANT growth
- Publication
Pakistan Journal of Agricultural Sciences, 2015, Vol 52, Issue 1, p177
- ISSN
0552-9034
- Publication type
Article