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Wen P.,Shihezi University | Wu Z.,Shihezi University | He Y.,Shihezi University | Ye B.-C.,Shihezi University | And 3 more authors.
RSC Advances | Year: 2016

A slow-release fertilizer (SRF) was synthesized in one step based on urea incorporated in a polymer matrix composed of sodium alginate (NaAlg), acrylic acid (AA), acrylamide (AM) and bentonite (Bent) via microwave irradiation. The proposed microwave-assisted method yielded high reaction rates with less reaction time of 5 minutes at 300 W. The raw materials and final products were characterized in terms of the structure and properties through Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and uniaxial compression measurements. The application potential was verified on the basis of swelling in different environments, largest water-holding ratio and water-retention capacity of soil, release study in soil, and the effect of the proposed SRF product on the germination rate of cotton seed. Results indicated that the addition of Bent not only contributed to the increase in water absorbency, largest water-holding ratio and water-retention capacity of soil, but also caused the system to liberate the nutrient in a more prolonged manner based on a Case II release mechanism with skeleton erosion. Thus, microwave irradiation would be a possible method to produce SRFs for potential agricultural and horticultural applications. © The Royal Society of Chemistry 2016.


He Y.,Shihezi University | Wu Z.,Shihezi University | Ye B.-C.,Shihezi University | Wang J.,Xinjiang Agricultural Reclamation Academy of science | And 2 more authors.
European Journal of Soil Biology | Year: 2016

This study was analyzed the survival and colonization efficiency of encapsulated Pseudomonas putida Rs-198 prepared with alginate sodium, bentonite, and starch on cotton root under saline conditions. The FTIR and XRD findings in this study showed that absence of chemical reactions and good mixing performance were detected with alginate, starch, and bentonite. The survival rates of P. putida Rs-198 were 81.07%, 89.67% in free and encapsulated bacteria, respectively, after 50 days of storage. The amount of colonization by encapsulated P. putida Rs-198 was less than that of free P. putida Rs-198 at days 7-21 and was significantly higher than that of free P. putida Rs-198 after day 35. This level was sustained for up to day 63. At day 49, the population size of the encapsulated P. putida Rs-198 significantly increased by 2.48% and 2.44% compared with free P. putida Rs-198 at day 49 under 0% and 2% salt stress, respectively. The cotton biomass was significantly increased by the encapsulated P. putida Rs-198 strain under salt stress. This finding may be attributed to the increase in the number of bacteria and the high level of indole-3-acetic acid and gibberellin production. Thus, microcapsule bio-inoculants are potential alternatives for sustainable agriculture. © 2016 Elsevier Masson SAS.

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