A review of mathematical modeling and simulation of controlled-release fertilizers

Pavlenko

Period. Polytech. Chem. Eng.

et al. 2019

The article is devoted to the study of reducing the technogenic load from high-dose nitrogen pollution of the soil layer by encapsulating granules of nitrogen fertilizers in slowly soluble phosphate-containing membranes. The process of dissolving and washing out of the primordial soil layer of the nutrients from urea, encapsulated by superphosphate shells in soil columns, was studied according to agrochemical techniques. The purpose of the work is to determine the parameters of the investigated process, based on which the previously developed physical model of soil washing of moving nitrogen forms, based on experimental data. The process of changing the loss of nitrogen from the soil when using different types of fertilizers depending on the amount of washing was studied by simulation. Mathematically, the process is described in general terms as a linear differential equation of the first order in partial derivatives. The solution of the equation under the initial and boundary conditions allowed to calculate the parameters of the model describing the nature of changes in the losses of nitrogen from the soil column. Comparison of calculated and experimental data showed a coincidence of values with a correlation coefficient above 0.96 for investigated nitrogen fertilizers with different composition of the phosphate-containing coating.

Section: Literature Reviewmentioning

confidence: 99%

Mathematical Modeling of Nutrient Release from Capsulated Fertilizers

Pavlenko

Period. Polytech. Chem. Eng.

et al. 2019

“…Controlled-release fertilizers technology consist of encapsulated materials coated by polymers deliberately made to allow for slow release of the active nutrient, maintaining prolonged nutrient release in synchronization with plant metabolic needs. CRF technology is designed to have optimal nutrient release, that is, the nutrient release rate corresponds to the maximum rate of nutrient uptake by plants, which varies dynamically during the plant growth stages over the growing season (Irfan et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Controlled-Release Fertilizer on Growth of Melanoxylon brauna Schott Seedlings

et al. 2019

Melanoxylon brauna is a tree species native to the Atlantic Forest of high ecological and economic value. The objective of this study was to evaluate the growth and nutritional status of seedlings of two Melanoxylon brauna cultivars grown in substrate with different controlled-release fertilizer doses (CRF). The experiment was arranged in a randomized block 4 × 2 factorial design, with four CRF doses (0, 2, 4, and 8 kg m -3 ) and two seed origins (Viçosa-MG and Linhares-ES), with four replicates and 126 seedlings per plot. At 60, 90, and 120 days after emergence, seedlings were collected to measure variables related to emergence, growth, and nutrition. The greatest growth and best nutritional status were found for seedlings originated from seeds collected in Linhares at CRF dose of 8 kg m -3 . On the other hand, seedlings originated from seeds collected in Viçosa showed low emergence and high plant mortality.

J of Applied Polymer Sci

“…The value of initial diffusion coefficient, D of both samples is affected by the chemical structure and the surface area of the polymer, where the value of D for NPK coated with SAP is higher than NPK coated with SPC. This shows that the incorporation of carbonaceous microsphere filler into the polymer aids in controlling the release rate of the nutrients into soil; the nutrients are released slower from NPK coated with SPC than NPK coated with SAP …”

Section: Resultsmentioning

confidence: 97%

“…, where Mt / M is the released fraction at time t , n is the release exponent, and k is the release factor. According to the Korsmeyer–Peppas model developed in 1983, a value of n of ≤0.5 implies that the fertilizer release mechanism approaches a Fickian diffusion‐controlled release, n = 1.0 signifies that the fertilizer release mechanism approaches Case II transport, which is zero order release, whereas n = 0.5–1.0 indicates that the fertilizer release mechanism is anomalous transport, also known as non Fickian diffusion . Table summarizes the values for N, P, and K release from NPK coated with SAP and NPK coated with SPC in soil.…”

Section: Resultsmentioning

confidence: 99%

Carbonaceous microsphere‐based superabsorbent polymer as filler for coating of NPK fertilizer: Fabrication, properties, swelling, and nitrogen release characteristics

Khan

Zakaria

Kim

et al. 2019

Recently, the use of controlled release fertilizers in agriculture has resulted in huge benefits in plant growth and cultivation. Superabsorbent polymer (SAP)‐coated fertilizers have the added advantage in retaining water in soil after irrigation and also reduce the nutrient release rate from soil in a controlled manner. This study aimed to produce a nitrogen–phosphorus–potassium (NPK) fertilizer coated with superabsorbent carbonaceous microspheres polymer (SPC) by inverse suspension polymerization method with water‐retention and controlled release properties. Two sets of experiments were conducted: (1) three different weight percentages and (2) different materials. NPK coated with SPC showed increasing water‐retention ability with respect to carbon microsphere percentages and retains >80% water at the 30th day of experiment compared with pure NPK and NPK coated with SAP. The slow release behavior of all samples was investigated by induced coupled plasma mass spectrometry spectrometry and results showed that NPK coated with SAP and SPC has a low release rate with <50% nutrient release compared with uncoated NPK at the 30th day. The release mechanism kinetics of NPK coated with SAP and SPC were studied based on the Kosmeyer–Peppas model. The mechanisms approached Fickian diffusion‐controlled release as the n value for both samples was less than 0.5. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48396.