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Agronomy
Special Issues
Application of Controlled Release Fertilizers on Crops for Sustainable Agriculture
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Application of Controlled Release Fertilizers on Crops for Sustainable Agriculture

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Soil and Plant Nutrition".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 3791

Special Issue Editor

Dr. Zhiguang Liu

E-Mail Website
Guest Editor
College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China
Interests: theoretical industrialized and applied research of controlled release fertilizer

Special Issue Information

Dear Colleagues,

[*] Background and history of this topic:

Chemical fertilizers are fundamental materials used in modern agriculture and play an irreplaceable role in ensuring food security. However, for the sake of a significant increase in yield production, over-application of that generates nutrient loss through volatilization, immobilization, denitrification and leaching, which lead to resource waste, soil structure failure and environmental pollution risks. Coping with this challenge requires more efficient fertilizers.

[*] Aim and scope of the Special Issue:

Controlled release fertilizers (CRFs) can release nutrients gradually into the soil with periods. Many factors motivate this application, including the reduction of fertilization frequency and labor cost, improvement of crop yield and net return, and protecting plants from chemical damage.

[*] Cutting-edge research:

The investigation of CRFs for sustainable agriculture requires comprehensive studies of various aspects, including fertilization pattern, nutrient utilization, plant physiology, yield production, soil properties, coated material degradation and environmental influence.

[*] What kind of papers we are soliciting:

In this Special Issue, we aim to exchange knowledge on any aspect related to controlled release fertilizers, thus facilitating their development and popularization for sustainable agriculture.

Dr. Zhiguang Liu
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Agronomy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • agronomy
  • physiology
  • microecology
  • yield
  • utilization rate
  • soil properties
  • nutrient release characteristics
  • volatilization
  • leaching
  • degradation

Published Papers (2 papers)

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Research

17 pages, 11061 KiB  
Article
Synthesis and Application of Modified Lignin Polyurea Binder for Manufacturing a Controlled-Release Potassium Fertilizer
by Mingyang Li, Gaoyang E, Conghui Wang, Ruolin Shi, Junxi Wang, Shuo Wang, Yu Wang, Qi Chen, Zeli Li and Zhiguang Liu
Agronomy 2023, 13(10), 2641; https://doi.org/10.3390/agronomy13102641 - 19 Oct 2023
Viewed by 1184
Abstract
Conventional potassium chloride granules have inefficient applications in agricultural production due to particle irregularity and low fluidity. The application of controlled-release potassium chloride could increase the potassium-use efficiency and alleviate the shortage of potassium ore resources. In this study, a well-rounded potassium chloride [...] Read more.
Conventional potassium chloride granules have inefficient applications in agricultural production due to particle irregularity and low fluidity. The application of controlled-release potassium chloride could increase the potassium-use efficiency and alleviate the shortage of potassium ore resources. In this study, a well-rounded potassium chloride fertilizer core was prepared, using the graft modification of polyurea to enhance the coating rate and release performance. The adhesive and tensile characteristics of the modified polyurea binder, as well as the granule properties of modified polyurea binder potassium chloride, were studied to determine the ideal lignin-grafted ratio. The effect of the modified polyurea binder with potassium chloride on the properties of coated fertilizer was investigated. The findings, shown by radar maps of the binder’s properties, demonstrated that the ideal mass ratio of the modified lignin polyurea binder to urea is 1:2. The Fourier-transform infrared spectroscopy results demonstrated that the amino functional groups of lignin were enhanced, improving the product’s interfacial compatibility with the polyurea matrix. Compared to humic acid (HA; 12%) and bentonite (Ben; 30%) treatments, the granule intensity of the 9.9%—1:2 treatment considerably increased by 139.10% and 38.86%, respectively, while the static angle of the granules reduced by 16.67% and 3.81%. The 28-day cumulative release rate of the modified polyurea (9.9%—2:1) with a 5% coating thickness was the lowest (28%), 42% lower than that of the lowest conventional treatment. In summary, the creation of a bio-lignin polyurea binder under the optimum conditions reduced the need for petrochemical-based materials, allowed the preparation of fertilizer with granules of increased fluidity, and enabled the successful coating of a high-salt potassium fertilizer, offering a novel technique for the high-value application of potash fertilizer coating. Full article
(This article belongs to the Special Issue Application of Controlled Release Fertilizers on Crops for Sustainable Agriculture)
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23 pages, 5501 KiB  
Article
Optimization of Fluidized-Bed Process Parameters for Coating Uniformity and Nutrient-Release Characteristics of Controlled-Release Urea Produced by Modified Lignocellulosic Coating Material
by Arshid Mahmood Ali, Babar Azeem, Ahmad M. Alghamdi, Khurram Shahzad, Abdulrahim Ahmad Al-Zahrani, Muhammad Imtiaz Rashid, Aishah Binti Mahpudz and Asif Jamil
Agronomy 2023, 13(3), 725; https://doi.org/10.3390/agronomy13030725 - 28 Feb 2023
Viewed by 1996
Abstract
Controlled-release fertilizers are employed in precision agriculture to optimize technology-enabled farming without environmental deterioration. In this study, almond-shell lignocellulosic waste particles are chemically processed to synthesize a coating suspension for the production of controlled-release urea (CRU) in a Wurster fluidized-bed reactor. The interactive [...] Read more.
Controlled-release fertilizers are employed in precision agriculture to optimize technology-enabled farming without environmental deterioration. In this study, almond-shell lignocellulosic waste particles are chemically processed to synthesize a coating suspension for the production of controlled-release urea (CRU) in a Wurster fluidized-bed reactor. The interactive effect of process parameters such as atomizing air pressure (Pair), fluidized-bed temperature (Tfb), spray rate (Rspray), and fluidizing-air flow rate (Qair) on the (i) coating-film uniformity of CRU particles and (ii) longevity of nutrient-release from CRU is reported. CCRD is used with RSM to design the experiments for the optimization of nutrient-release performance and coating-film uniformity in terms of a coefficient-of-variance (CoV) of film thickness. The regression models indicate a good prediction of coating-film uniformity and nutrient-release time, with R2 = 0.971 and R2 = 0.98, respectively. The optimum conditions for coating-film uniformity are determined to be Pair = 3.5 bar, Tfb = 80 °C, Rspray = 0.15 mL/s, and Qair = 72 m3/h, with a predicted CoV film thickness of 11.5%. Similarly, Pair = 3.2 bar, Tfb = 78 °C, Rspray = 0.125 mL/s, and Qair = 75 m3/h are the optimum conditions for nutrient-release performance, with a prediction nutrient-release time = 56 h. The experimental validation yields a CoV of film thickness = 12.6% and a nutrient-release time = 49.5 h, indicating good agreement between predicted and experimental values. In addition, Tfb appears to be the most significant parameter. Full article
(This article belongs to the Special Issue Application of Controlled Release Fertilizers on Crops for Sustainable Agriculture)
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