Preparation of Microcapsules of Slow-Release NPK Compound Fertilizer and the Release Characteristics

Pang, Wancheng; Hou, Dejia; Wang, Huan; Sai, Shu; Wang, Baorui; Ke, Jingwen; Wu, Gaobing; Li, Qing; Holtzapple, Mark T.

doi:10.21577/0103-5053.20180117

Cited by 15 publications

(27 citation statements)

References 17 publications

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“…Because fertilization of agricultural soils with urea increases the risks of environmental pollution due to the distribution of excess nitrogen, creating SRF composites that control the release of nitrogen to plants is necessary [17][18][19]. Based on urea as an SRF component, polymers [20,21], clay minerals such as montmorillonite [22,23], and kaolinite [24,25] were investigated. Clay minerals are environmentally stable and cheap for the synthesis of SRF [10,11,[26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

et al. 2019

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We investigated the mechanochemical synthesis of complex slow release fertilizers (SRF) derived from glauconite. We studied the effectiveness of the mechanical intercalation of urea into glauconite using planetary and ring mills. The potassium-nitric complex SRFs were synthesized via a mechanochemical method mixing glauconite with urea in a 3:1 ratio. The obtained composites were analyzed using X-ray diffraction analysis, scanning electron microscopy, X-ray fluorescence analysis, and infrared spectroscopy. The results show that as duration of mechanochemical activation increases, the mineralogical, chemical, and structural characteristics of composites change. Essential modifications associated with a decrease in absorbed urea and the formation of microcrystallites were observed when the planetary milling time increased from 5 to 10 min and the ring milling from 15 to 30 min. Complete intercalation of urea into glauconite was achieved by 20 min grinding in a planetary mill or 60 min in a ring mill. Urea intercalation in glauconite occurs much faster when using a planetary mill compared to a ring mill.

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Section: Introductionmentioning

confidence: 99%

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

et al. 2019

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“…Also they gave the highest values of residual elements in soil due to their low activity index, compared with the fastrelease mineral fertilizer which gave the lowest values of available elements left in the soil (Mikkelesen et al, 1994). Moreover, the advantages of using slow-release fertilizers instead of conventional fertilizers are various, such as higher efficiency of the fertilizer, the continuous supply of nutrients for a prolonged period, and lower nutrient losses due to volatilization and leaching (Chawakitchareon et al, 2016 andPang et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Thereby, they can minimize the pollution of soil and water associated with fertilizer over dosage and leaching. Slow-release fertilizers have good properties, are cost-saving and environment friendly, and thus can efficiently improve the utilization efficiency of fertilizers in agricultural production (Pang et al, 2018); they found that release amounts of N, P, and K after 5 days were 95.39, 95.28, and 96.75% in water, and 83.35, 96.62, and 90.75% in soil, respectively. However, little is known about the effects of slow-release compound fertilizers especially under new reclaimed lands' conditions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of almond young trees growth and nutritional status under different slow-release compound fertilizer types and doses at Nubaria region

et al. 2019

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Background: Slow-release fertilizers (SRF) are quite numerous, and diverse group of materials are involved in the improvement of the effectiveness of fertilization, mitigation of the negative impact of fertilizers on the environment, and the reduction of labor and energy consumption connected with the application of conventional fertilizers. The objective of the experiment was to measure vegetative growth parameters and nutritional status of Nonpareil almond young trees under two types of slow-release compound fertilizers: Matador at 30, 60, and 120 kg/Feddan and Nitrophoska at (25, 50, and 100 kg/Feddan. The experiment was conducted in the Experimental Research Station of National Research Centre at Nubaria, El Behera governorate, Egypt, during successive growing seasons 2018 and 2019. Results: The results indicated that increasing doses of slow-release fertilizer significantly improved vegetative growth of trees. The highest dose of Nitrophoska had significantly higher stem length, diameter, numbers of branches and leaves/trees, leaf area, leaf chlorophyll content, leaf fresh and dry weight while the highest significant of specific leaf dry weight was obtained by applying the highest dose of Matador compared with control trees that received the fast-release fertilizer NPK 19:19:19 at 200 kg/Feddan. Leaf mineral contents of some macro (N, P, K and Mg) and micro elements (Fe, Mn, Zn, and Cu) were significantly increased as a result of application with slowrelease fertilizers. Nitrophoska at 100 kg/Feddan gave the highest values of nitrogen, potassium, magnesium, and iron while Matador at 120 kg/Feddan gave the highest value of manganese. Matador at all doses resulted in a significant increment in phosphorus concentration in leaves in both seasons. Nitrophoska at 100 kg/Feddan and Matador at 120 kg/Feddan recorded the highest values of zinc and copper without significant differences between them. Conclusions: It could be concluded that application with slow-release fertilizers resulted in a positive and significant influence on most investigated vegetative growth measurements and leaf mineral contents of Nonpareil almond trees, since the application with Nitrophoska at 100 kg/Feddan was the most effective treatment for increasing growth measurements and improving leaf nutritional status of Nonpareil almond trees grown under Nubaria condition.

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“…(46). Dipotassium phosphate and urea were coated by lignin and formaldehyde to prepare microcapsules of NPK, Fast release of the nutrients was observed at lower pH (47). Lignin polyureamicrocapsules (LPMC) were synthesized by interfacial polymerization based on Pickering emulsion templates of lignin particle-stabilized oil in water to encapsulate avermectin (48).…”

Section: Introductionmentioning

confidence: 99%

Release behavior of oxyfluorfen polyurea capsules prepared using PVA and kraft lignin as emulsifying agents and phytotoxicity study on paddy

Rao

Chandrani

Powar

et al. 2021

Green Chemistry Letters and Reviews

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Polyurea microcapsules containing oxyfluorfen herbicide were synthesized by interfacial polymerization reaction between toluene diisocyanate and ethylene diamine at various core to shell ratios using green solvent N-N-dimethyldecanamide as carrier medium and using biodegradable PVA203S and Kraft lignin grade (varying molecular weight) as the emulsifying agent. The study was done to understand the effect of stirring rate on preparing microcapsules and find out how the process conditions changed the attributes of microcapsules such as particle size distribution, encapsulation efficiency and release kinetics. The formation of capsules was confirmed by FT-IR, SEM and TGA. The study indicated that the encapsulation efficiency decreased with increasing core to shell ratio. The change in release kinetics was based on the stirring rate and was dependent on the pH of release medium. Particle size distribution was influenced by the agitation speed during formation of emulsion. Kraft lignins of varying molecular weight were used to synthesize the polyurea capsules. It was found that capsules with high molecular weight lignin showed slow and sustained release. Synthesized polyurea capsules was subjected to safety study on paddy crop and compared with commercially available oxyfluorfen and was found to be safe for use on paddy crop.

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Preparation of Microcapsules of Slow-Release NPK Compound Fertilizer and the Release Characteristics

Cited by 15 publications

References 17 publications

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

Evaluation of almond young trees growth and nutritional status under different slow-release compound fertilizer types and doses at Nubaria region

Release behavior of oxyfluorfen polyurea capsules prepared using PVA and kraft lignin as emulsifying agents and phytotoxicity study on paddy

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