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

2000 ◽  
Vol 43 (3) ◽  
pp. 661-664 ◽  
Author(s):  
K. W. King ◽  
J. C. Balogh
Keyword(s):  
Slow Release ◽  
Nitrogen Release ◽  
Slow Release Fertilizers

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

2020 ◽  
Vol 9 (1) ◽  
pp. 139-152 ◽  
Author(s):  
Xiao Zhang ◽  
Yanlu Liu ◽  
Panfang Lu ◽  
Min Zhang
Keyword(s):  
Slow Release ◽  
Environmentally Friendly ◽  
Water Absorbency ◽  
The Novel ◽  
Structure And Properties ◽  
Nitrogen Release ◽  
Release Property ◽  
Slow Release Fertilizers ◽  
Grafting Copolymerization ◽  
Cross Linker

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.

scholarly journals Nitrogen Release Characteristics of a Bag Controlled Release Fertilizer

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.

Nitrogen Release from Slow-Release Fertilizers in Soils with Different Microbial Activities

Pedosphere ◽  
2018 ◽  
Vol 28 (2) ◽  
pp. 332-340 ◽  
Author(s):  
Pierfrancesco NARDI ◽  
Ulderico NERI ◽  
Giovanni DI MATTEO ◽  
Alessandra TRINCHERA ◽  
Rosario NAPOLI ◽  
...  
Keyword(s):  
Slow Release ◽  
Nitrogen Release ◽  
Microbial Activities ◽  
Slow Release Fertilizers

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

Minerals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 507 ◽  
Author(s):  
Maxim Rudmin ◽  
Elshan Abdullayev ◽  
Alexey Ruban ◽  
Ales Buyakov ◽  
Bulat Soktoev
Keyword(s):  
Milling Time ◽  
Slow Release ◽  
Mechanochemical Activation ◽  
Structural Characteristics ◽  
Fluorescence Analysis ◽  
Planetary Mill ◽  
X Ray Diffraction ◽  
Mechanochemical Method ◽  
X Ray ◽  
Slow Release Fertilizers

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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