Urea–hydroxyapatite nanohybrid as an efficient nutrient source in<i>Camellia sinensis</i>(L.) Kuntze (tea)

Raguraj, Sriharan; Wijayathunga, W. M. S.; Gunaratne, G.P.; Amali, Rathnasekara Kuruppu Arachchige; Priyadarshana, Gayan; Sandaruwan, Chanaka; Karunaratne, Veranja; Hettiarachchi, L.S.K.; Kottegoda, Nilwala

doi:10.1080/01904167.2020.1771576

Cited by 31 publications

(19 citation statements)

References 20 publications

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“…Baobab plants sprayed with nHAP showed a significant increase in several growth traits (plant height, stem diameter, number of leaves per plant, leaf area, root length, total dry weight) compared to conventional P fertilizers. A conceptually similar study was conducted on Camelia sinensis [56]. Different P fertilization strategies were tested, which included comparing conventional fertilizers and nHAP, and a different fractionation of doses.…”

Section: Nano-hydroxyapatite As Source Of Phosphorusmentioning

confidence: 99%

Tools for Nano-Enabled Agriculture: Fertilizers Based on Calcium Phosphate, Silicon, and Chitosan Nanostructures

et al. 2021

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The Green New Deal requires a profound transformation of the agricultural sector, which will have to become more sustainable and ensure universal access to healthy food. Thus, it will be essential to introduce radical technological innovations. Nanotechnologies have the potential to produce a significant boost to the improvement of the food system. Within this context, in the next years, a strong challenge will need to be faced regarding developing new and more efficient uses of nutrients in agriculture, being the nutrient use efficiency (NUE) paramount in sustaining high crop productivity without depleting biodiversity, and altering both the natural and agricultural systems. Nutrients leaching causes environmental pollution and water eutrophication, while nutrient excess favors pest and weed widespread. Therefore, it will be mandatory to improve plant nutrition efficiency without affecting agricultural productivity and economic sustainability. A promising alternative consists of the introduction of the so-called nanomaterial enhanced fertilizers and plant growth stimulators. Such innovation includes nanotechnological solutions that can improve nutrient delivery for a more finely tuned, accurate, and saving-resources distribution of nutrients. This review provides a critical view of the latest advances in nanofertilizer research, mainly referring to nano-hydroxyapatite, silica nanoparticles, and chitosan-derived nanostructures.

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Section: Nano-hydroxyapatite As Source Of Phosphorusmentioning

confidence: 99%

Tools for Nano-Enabled Agriculture: Fertilizers Based on Calcium Phosphate, Silicon, and Chitosan Nanostructures

et al. 2021

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“…In previous research work done by our team, we have reported that hydroxyapatite-urea (HA-Urea) nanohybrid is capable of releasing nitrogen 12 times slower compared to pure urea confirming the applicability of HA-urea nanohybrids as a controlled release fertilizer (Kottegoda et al, 2013, Gunaratne et al, 2016, Kottegoda et al, 2014b. Further, urea-HA nano-systems were developed, incorporated layered materials, and investigated the efficacy of these new formulations using rice and tea as model crops (Kottegoda et al, 2012, Madusanka et al, 2017, Raguraj et al, 2020. Moreover, HA nanoparticles have been coated with citric acid and utilized as a slow-release P plant nutrient composition to improve the growth efficiency of corn (Samavini et al, 2018).…”

Section: Introductionmentioning

confidence: 92%

Urea-Hydroxyapatite-Polymer Nanohybrids as Seed Coatings for Enhanced Germination

et al. 2022

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Modern agriculture practices play a vital role in fulfilling the doubling food demands of the increasing population. In particular, several attempts have been made to enhance the nutrient supply and plant uptake process in different growth stages of plants, but little effort has been made to enhance the nutrient status of the seeds at the seedling stage. At this stage of growth, phosphorus is the most essential nutrient, and the requirement is high, while nitrogen requirement is very low. This study focuses on developing a seed coating containing urea-modified hydroxyapatite nanocomposite to supply N and P to the seedlings in a controlled manner throughout the early growth stage. A nanohybrid based on urea-modified hydroxyapatite was synthesized using an in-situ sol-gel method and further combined with an alginate/cellulose polymer to develop the coating. Seed coating was realized using a dip coating method containing calcium chloride as the cross-linking agent. Seed germination experiments were conducted under laboratory conditions according to a randomized complete block design under constant light conditions, controlled humidity, and temperature. The structural features of the nanocomposite were studied using powder X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopic data was used to analyze the morphology. The formation of HA nanoparticles was confirmed by powder x-ray diffraction patterns that revealed the characteristic peaks for (002), (211), (300), and (202) planes of HA. Furthermore, the successful insertion of urea into the HA lattice was corroborated by both the powder X-ray diffraction and Fourier transform infrared spectroscopic techniques. Nanocomposite coatings of 50 -100 μm demonstrated excellent compatibility with the surfaces of the seeds. Seed coating composed of hydroxyapatite-urea (1:0.3) treatment revealed an increase of 124.6%, 147.6%, 100%, and 166.7% in average biomass, root length, number of roots, and maximum plant width, respectively, compared to the control, after 21 days of planting.Keywords: Urea Modified Hydroxyapatite, Nanocomposite, Alginate, Carboxymethyl Cellulose, Seed Coating, Germination.

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“…CRFs which are sometimes referred to as slow-release fertilisers (SRFs) have been developed as an approach towards solving the issues that arise from the application of conventional fertilisers [85,[88][89][90]. CRFs are designed with the aim to release the active ingredient at a controlled rate and to support by providing adequate nutrients for crop production [91,92]. Comparing three treatments each receiving 105 N ha −1 year −1 from oilcake, Wu et al (2018) found that the plots receiving 120 kg N CRF ha −1 year −1 had 31% higher yields (4.1 t ha −1 year −1 ) than those (3.1 t ha −1 year −1 ) in plots receiving 345 kg N-urea ha −1 year −1 [93].…”

Section: Intercropping With Legumesmentioning

confidence: 99%

“…However, the plots receiving 345 kg N CRF ha −1 year −1 had the lowest yield (2.9 t ha −1 year −1 ), which was associated with an inhibition of photosynthesis. In Sri Lanka, Raguraj et al (2020) noted a 10-17% yield increase from the application of urea-coated "nanohybrid" CRF fertilisers compared with standard fertiliser treatments [92]. In China, Liu et al (2012) [30] reported a 6-13% decrease in yields from CRFs-treated crops when compared with conventional fertilisers in a two-year study, but the difference was not statistically significant.…”

Section: Intercropping With Legumesmentioning

confidence: 99%

Identifying Sustainable Nitrogen Management Practices for Tea Plantations

2022

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Tea (Camellia sinensis L.) is the most widely consumed beverage in the world. It is mostly grown in the tropics with a heavy dependence on mineral nitrogen (N) fertilisers to maintain high yields while minimising the areas under cultivation. However, N is often applied in excess of crop requirements, resulting in substantial adverse environmental impacts. We conducted a systematic literature review, synthesising the findings from 48 studies to assess the impacts of excessive N application on soil health, and identify sustainable, alternative forms of N management. High N applications lead to soil acidification, N leaching to surface and groundwater, and the emission of greenhouse gases including nitrous oxide (N2O). We identified a range of alternative N management practices, the use of organic fertilisers, a mixture of organic and inorganic fertilisers, controlled release fertilisers, nitrification inhibitors and soil amendments including biochar. While many practices result in reduced N loading or mitigate some adverse impacts, major trade-offs include lower yields, and in some instances increased N2O emissions. Practices are also frequently trialled in isolation, meaning there may be a missed opportunity from assessing synergistic effects. Moreover, adoption rates of alternatives are low due to a lack of knowledge amongst farmers, and/or financial barriers. The use of site-specific management practices which incorporate local factors (for example climate, tea variety, irrigation requirements, site slope, and fertiliser type) are therefore recommended to improve sustainable N management practices in the long term.

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Urea–hydroxyapatite nanohybrid as an efficient nutrient source inCamellia sinensis(L.) Kuntze (tea)

Cited by 31 publications

References 20 publications

Tools for Nano-Enabled Agriculture: Fertilizers Based on Calcium Phosphate, Silicon, and Chitosan Nanostructures

Tools for Nano-Enabled Agriculture: Fertilizers Based on Calcium Phosphate, Silicon, and Chitosan Nanostructures

Urea-Hydroxyapatite-Polymer Nanohybrids as Seed Coatings for Enhanced Germination

Identifying Sustainable Nitrogen Management Practices for Tea Plantations

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