Preparation and properties of hydrogel based on sawdust cellulose for environmentally friendly slow release fertilizers

AbstractA novel hydrogel slow-release nitrogen fertilizer based on sawdust with water absorbency was prepared using grafting copolymerization. Urea was incorporated as nitrogen source in a hydrogel fertilizer. Potassium persulfate (KPS) and N,N᾽-methylenebis acrylamide (MBA) were used as the initiator and cross-linker, respectively. The structure and properties of the samples were characterized by XPS, EDS, SEM, XRD and FTIR. The effects of various salt solutions, ionic strength and pH on swelling behavior were discussed. The results showed that the largest water absorbency of the sample reached 210 g/g in distilled water. In addition, the sample had the good nitrogen release property. Thus, the novel environmentally friendly hydrogel fertilizer may be widely applied to agricultural and horticultural fields.

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DEVELOPMENT OF A NITROGEN-RELEASE ALGORITHM FOR SLOW-RELEASE FERTILIZERS

Transactions of the ASAE ◽

10.13031/2013.2747 ◽

2000 ◽

Vol 43 (3) ◽

pp. 661-664 ◽

Cited By ~ 4

Author(s):

K. W. King ◽

J. C. Balogh

Keyword(s):

Slow Release ◽

Nitrogen Release ◽

Slow Release Fertilizers

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Preparation of an Environmental Friendly Slow Release Nitrogen Fertilizer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1015.346 ◽

2014 ◽

Vol 1015 ◽

pp. 346-349 ◽

Cited By ~ 1

Author(s):

Jing Li ◽

Yu Sen Hu ◽

Lu Mei Pu ◽

Guang Sheng Guo ◽

Hong Yan Niu

Keyword(s):

Slow Release ◽

Nitrogen Release ◽

Dialdehyde Starch ◽

Element Analysis ◽

Modern Agriculture ◽

Environmental Friendly ◽

Release Property ◽

Potential Applications ◽

Early Farming ◽

Slow Release Urea

An environmental friendly slow-release urea fertilizer with double films (SUFDF) was prepared by using dialdehyde starch urea resin (DASU) as inner coating and polylactic acid (PLA) as outer materials. The structural, chemical characteristics and morphology of the SUFDF were characterized by FTIR, element analysis and SEM. Its efficiency in slowing the nitrogen release was examined via soil leaching and pot experiments. The experimental results indicated that the introduction of hydrophobic PLA and DASU reduced the swell ability of the fertilizer, which made it can provide nitrogen persistently at the early farming. After the urea dissolved, the DASU in the fertilizer would continue to release nitrogen due to its good slow-release property. So this fertilizer would have potential applications in modern agriculture and horticulture.

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Nitrogen Release Characteristics of a Bag Controlled Release Fertilizer

Research in Ecology ◽

10.30564/re.v2i1.1205 ◽

2019 ◽

Vol 2 (1) ◽

Author(s):

Yi Zhong ◽

Renyi Gui ◽

Zhuangzhuang Qian ◽

Shunyao Zhuang

Keyword(s):

Controlled Release ◽

Evaluation Method ◽

Ammonia Volatilization ◽

Slow Release ◽

Ammonia Emission ◽

N Leaching ◽

Nitrogen Release ◽

N Release ◽

Slow Release Fertilizers ◽

Controlled Release Fertilizers

Slow release fertilizers are designed to enhance crop yield and minimizing the loss of nitrogen (N) to environment. However, N release in leaching and loss in ammonia emission from bag controlled release fertilizers have not been previously evaluated under the standardized conditions in soil. Accordingly, a laboratory study was conducted to evaluate the characteristics of N release from a bag controlled fertilizer with 1, 3, 5 and 7 rows of hole (B-1, B-3, B-5, B-7) and a kraft bag without hole (B-W). The results showed that the amount of N leaching of B-1, B-3, B-5, B-7 and B-W were significantly lower than urea fertilizer without bag (U). The maximum N release from the fertilizers followed the order: U (83.16%) > B-7 (54.61%) > B-5 (54.02%) > B-W (51.51%) > B-3 (48.87%) > B-1 (38.60%) during the experimentation. Compared with U treatment, ammonia volatilization losses were significantly decreased by B-1, B-3, B-5, B-7 and B-W treatments. Based on N release and loss, a suitable bag with holes should be considered in practice when using the bag controlled fertilizer to meet an environment good objective. The evaluation method merits further study combined with field experiment.

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