Characteristics and Performance of Novel Water-Absorbent Slow Release Nitrogen Fertilizers

He, Xu-sheng; Zong-wen, Liao; Ping, Huang; Duan, Ji-xian; Ge, Ren-shan; Li, Hongbo; Zhang, Geng

doi:10.1016/s1671-2927(07)60054-6

Cited by 32 publications

(23 citation statements)

References 11 publications

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“…[22] Mixture of urea-kaolinite after 1 h dry grinding with chitosan binder released around 26.28 and 60.82% urea after 1 day and 30 days, respectively, which follows the CEN standard. The results were in line with He et al [27], Lan and Mingzhu [23] and Boli and Mingzhu [2]'s findings who reported the results of urea release according to this standard.…”

Section: Methodssupporting

confidence: 91%

Enhancement of nitrogen release properties of urea–kaolinite fertilizer with chitosan binder

Roshanravan

Soltani

Rashid

et al. 2015

Chemical Speciation & Bioavailability

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The use of controlled release fertilizer (CRF) has become a new trend to minimize environmental pollution. In this study, urea-kaolinite containing 20 wt% urea after one hour dry grinding was mixed with different concentrations of chitosan as a binder to prepare nitrogen-based CRF. Fourier transform infrared spectroscopy confirmed the hydrogen bonding between urea and kaolinite. Covalent interaction between urea-kaolinite and chitosan make the granules stronger. The nitrogen release was measured in 5 days interval using a diacetylmonoxime calorimetric method at a wavelength of 527 nm. The results illustrated that by increasing the chitosan concentration from 3 to 7.5%, nitrogen release decreased from 41.23 to 25.25% after one day and from 77.31 to 59.27% after 30 days incubation in water. Compressive stress at break tests confirmed that granules with chitosan 6% had the highest resistance and were chosen for ammonia volatilization tests. Ammonia volatilization was carried out using the forced-draft technique for a period of 10 weeks. The results showed that the total amount of ammonia loss for conventional urea fertilizer and urea-kaolinite-chitosan granules was 68.63 and 56.75%, respectively. This controlled release product could be applied in agricultural crop production purpose due to its controlled solubility in the soil, high nutrient use efficiency and potential economic benefits.

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Section: Methodssupporting

confidence: 91%

Enhancement of nitrogen release properties of urea–kaolinite fertilizer with chitosan binder

Roshanravan

Soltani

Rashid

et al. 2015

Chemical Speciation & Bioavailability

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“…The pH test and SI was measured according to He et al [15]. For calculation of the SI, one gram of sample and one gram of sodium nitrate were separately added to 200 ml distilled water.…”

Section: Ph and Salt Indexmentioning

confidence: 99%

“…The nutrient release measurement procedure was a modified method of He et al [15]. One gram portions of each sample were placed in dialysis bags and were first immersed in 200 ml distilled water in 250 ml glass bottles and the bottles were closed.…”

Section: Nutrient Release Measurementmentioning

confidence: 99%

Struvite-based fertilizer and its physical and chemical properties

Latifian

Liu²,

Mattiasson³

2012

Environmental Technology

103

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This study describes a method to formulate struvite fine powder into pellets that are easy to spread on agricultural land. To evaluate the quality of produced pellets, some chemical and physical properties commonly measured for fertilizers were tested. The findings indicated that the salt index and heavy metal content ofstruvite pellets were significantly lower than those of commercial NPK fertilizers. In addition, the percentage of nutrient released from struvite pellets after 105 days was in the range of 9.6-23.2, 8.4-26.7 and 11.3-32.6% for nitrogen, phosphorous and magnesium, respectively, which is considerably lower than that of commercial NPK fertilizer. Among different formulations between struvite crystals and binders, starch and bentonite were the most efficient in agglomerating struvite powder, leading to an increase in the crush strength to over the recommended limit of >2.5 kgf for fertilizer hardness.

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“…The literature reports few different methods of controlled release of urea into the soil. The controlled release of urea using naturally occurring biopolymers can offer some advantage to address these issues (He et al, 2007;Wu, Liu, & Rui, 2008). The use of chitosan, a linear random copolymer consisting of 2-amino-2-deoxy-␤-1,4-d-glucopyranose (major) and 2-acetylamino-2-deoxy-␤-1,4-d-glucopyranose (minor), in agriculture, is reported.…”

Section: Introductionmentioning

confidence: 99%