The Effect of pH in the Tap Water on Nutrient Release from Slow Release Fertilizers

2014 ◽  
Vol 931-932 ◽  
pp. 754-757
Author(s):  
Jittrera Buates ◽  
Petchporn Chawakitchareon ◽  
Rewadee Anuwattana
Keyword(s):  
Slow Release ◽  
Tap Water ◽  
Nutrient Release ◽  
Release Behavior ◽  
Release Formulation ◽  
Total N ◽  
Nutrient Contents ◽  
Scientific Methods ◽  
N Release ◽  
Slow Release Fertilizers

The objective of this research is to study the nutrient release behaviors on slow release fertilizer (Osmocote® N13:P13:K13, 3 month release formulation). The fertilizer was added into distilled water which adjusted pH of 6.5 and 7.5. The nutrient release behaviors were determined by collecting samples every 1 week and analyzed the nutrient contents in samples by scientific methods. As the result, for the total N release behavior, it may be considered that at lower pH condition tended to release more than that at higher one, for the P (shown by P2O5) and K (shown by K2O) release behaviors may be high at high pH condition.

Preparation and Properties of the Slow-Release Fertilizer with Green Coat

2012 ◽  
Vol 518-523 ◽  
pp. 4745-4748
Author(s):  
Qing Wang ◽  
Sha Chen ◽  
Pei Guang Zhao ◽  
Yu Cao ◽  
Long Fei Zhu ◽  
...  
Keyword(s):  
Water Retention ◽  
Slow Release ◽  
Nutrient Release ◽  
Release Behavior ◽  
Digestion Method ◽  
Slow Release Fertilizer ◽  
Environmental Friendly ◽  
Influence Of Water ◽  
Slow Release Fertilizers ◽  
Kjeldahl Digestion

A kind of double-coated environmental friendly fertilizer was prepared by urea as a core, well-mixed keratin and oxidation starch as an inner coating, and superabsorbent polymer as the outer coating. The influence of water absorbency, water retention, and the slow-release behavior of the study fertilizer were investigated. 0.01M CaCl2 immersion extraction and Kjeldahl digestion method were used to measure the content of nitrogen. And the result showed that the nutrient release was 72wt% on the thirtieth day. This result corresponded with the standard of slow release fertilizers of the Committee of European Normalization (CEN) [1]. Keratin and oxidation starch were biodegradable polymer and nontoxic. Both the properties of the materials and the result of the slow-release behavior suggested a new kind of excellent, environmental friendly, slow-release fertilizer.

Effects of temperature on nutrient release from slow-release fertilizers

1996 ◽  
Vol 46 (3) ◽  
pp. 179-187 ◽  
Author(s):  
M. E. Engelsjord ◽  
O. Fostad ◽  
B. R. Singh
Keyword(s):  
Slow Release ◽  
Nutrient Release ◽  
Slow Release Fertilizers ◽  
Effects Of Temperature

scholarly journals INCORPORATED SLOW-RELEASE FERTILIZER FOR CONTAINER-GROWN NURSERY STOCK

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 632f-632
Author(s):  
Bert T. Swanson ◽  
James B. Calkins ◽  
Daniel G. Krueger ◽  
Theresa L. Stockdale
Keyword(s):  
Slow Release ◽  
Production Systems ◽  
Nutrient Release ◽  
Critical Factor ◽  
Fertility Treatment ◽  
Plant Materials ◽  
Fertility Treatments ◽  
Nursery Stock ◽  
Slow Release Fertilizers ◽  
Successful Production

Media fertility is a critical factor in the successful production of container grown plants. Fertility treatments including fertigation and slow-release fertilizers (topdressed and incorporated) were compared. Fertility treatments were studied over a two-year period on a variety of deciduous and evergreen plant materials. Plant growth was quantified based on height, volume, branching, and quality. Soil fertility levels based on leachates were followed during the study. Nutrient release for incorporated fertilizers tested was variable although less so than when the same fertilizers were topdressed. Fertility treatment effects were species-dependent. Several incorporated, slow-release fertilizers, especially those high in nitrogen (Sierra 17-6-10, Sierra High N 24-4-6, Woodace Briquettes 23-2-0, Woodace 21-4-10), show promise for use in two-year container production systems.

scholarly journals Evaluation of Incorporated Slow-release Fertilizers for Two-year Container Production Systems.

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 794C-794
Author(s):  
James B. Calkins ◽  
Bert T. Swanson
Keyword(s):  
Slow Release ◽  
Production Systems ◽  
Nutrient Release ◽  
Dry Weight ◽  
Plant Performance ◽  
Fertility Treatment ◽  
Production Cycle ◽  
Plant Materials ◽  
Slow Release Fertilizers ◽  
Container Production

Media fertility, nutrient availability, and subsequently plant nutrition are critical factors that can be modified by growers to produce quality container-grown plants. The trend in container fertility has been toward incorporation of slow-release fertilizers; however, fertility release curves are variable and fertilizer longevity for many fertilizers is limited. Seventeen slow-release fertilizers were compared for longevity and plant performance over a 2-year production cycle using deciduous and evergreen plant materials. Plant growth was quantified based on height, volume, branching, dry weight, and quality. Soil fertility levels based on leachates were followed. Nutrient release for the incorporated fertilizers evaluated was variable. Fertility treatment effects were species-dependent. Several incorporated, slow-release fertilizers, especially those high in nitrogen and having extended release curves, including Nutricote 20–7–10, Scotts Experimental 24–6–10 and 26–6–11, Scotts Prokote Plus 20–3–10, Sierra 17–6–10, Sierra High N 24–4–6, Sierra Experimental 24–4–8, Woodace 21–4–10, Woodace 23–7–12, and Woodace Briquettes 23–2–0, show promise for use in 2-year container production systems.

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.

scholarly journals Synthesis and Characterization of Slow-Release Fertilizer Hydrogels Based on Hydroxy Propyl Methyl Cellulose, Polyvinyl Alcohol, Glycerol and Blended Paper as Second Layer

2021 ◽  
Author(s):  
Fartisincha Peingurta Andrew ◽  
Daniel T Gungula ◽  
Semiu A Kareem ◽  
Abdullahi M Saddiq ◽  
Esther F Adebayo ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Slow Release ◽  
Tap Water ◽  
Release Kinetics ◽  
Methyl Cellulose ◽  
Release Behavior ◽  
Order Model ◽  
Swelling Kinetic ◽  
Slow Release Urea

In this study, a slow-release urea fertilizer hydrogel was synthesized from hydroxyl propyl methyl cellulose, polyvinyl alcohol and glycerol blends with paper (blended paper) as second layer. The fertilizer hydrogel was characterized by SEM, XRD and FTIR. Its retention in sandy soil, swelling behavior in distilled and tap water as well as slow-release behavior to urea were investigated. The results indicated that the fertilizer had good slow-release properties and ability to retain water in soil. However, the addition of blended paper as a second layer matrix was found to help improve the release properties of the fertilizer. The swelling kinetic of the hydrogel followed the Schott’s Second order model. The release kinetics of urea in water was best described by the Zero order model signifying that the release behavior was independent of fertilizer concentration

scholarly journals Estimation of Release Properties of Slow-release Fertilizer Materials

2009 ◽  
Vol 19 (1) ◽  
pp. 13-15 ◽  
Author(s):  
L. Carolina Medina ◽  
Jerry B. Sartain ◽  
Thomas A. Obreza
Keyword(s):  
Slow Release ◽  
Nutrient Release ◽  
Exponential Model ◽  
Laboratory Method ◽  
Water Soluble ◽  
Official Method ◽  
Nutrient Sources ◽  
Time Period ◽  
Slow Release Fertilizers ◽  
Incubation Method

Slow-release fertilizers marketed to the public usually include a claim that nutrient release will last for a specific time period (e.g., 6, 9, or 12 months). However, no official laboratory method exists that can verify these claims. A long-term (180 days) incubation method has been developed that produces constants for an exponential model that characterizes nutrient release as a function of time. In addition, a relatively short-term (74 h) extraction method has been developed to assess nutrient release under accelerated laboratory conditions. Through regression techniques, release constants established for individual slow-release nutrient sources by the incubation method are used in conjunction with the laboratory extraction data to verify the release claims of slow-release fertilizers. Nutrient release for selected single materials has been predicted with greater than 90% accuracy in previous studies. Nutrient release from mixtures of slow-release products has been more variable. It is typical for water-soluble and slow-release fertilizers to be mixed in commercial products. Ultimately, it is intended that these methodologies will be accepted as an official method to verify nutrient release claims placed on slow-release fertilizers.

Optimization and Validation of an Accelerated Laboratory Extraction Method to Estimate Nitrogen Release Patterns of Slow- and Controlled-Release Fertilizers

2014 ◽  
Vol 97 (3) ◽  
pp. 661-676 ◽  
Author(s):  
L Carolina Medina ◽  
Jerry B Sartain ◽  
Thomas A Obreza ◽  
William L Hall ◽  
Nancy J Thiex
Keyword(s):  
Controlled Release ◽  
Extraction Method ◽  
Nutrient Release ◽  
Portion Size ◽  
Effect Of Temperature ◽  
Extraction Temperature ◽  
Test Portion ◽  
N Release ◽  
Slow Release Fertilizers ◽  
Controlled Release Fertilizers

Abstract Several technologies have been proposed to characterize the nutrient release and availability patterns of enhanced-efficiency fertilizers (EEFs), especially slow-release fertilizers (SRFs) and controlled-release fertilizers (CRFs) during the last few decades. These technologies have been developed mainly by manufacturers and are product-specific based on the regulation and analysis of each EEF product. Despite previous efforts to characterize EEF materials, no validated method exists to assess their nutrient release patterns. However, the increased use of EEFs in specialty and nonspecialty markets requires an appropriate method to verify nutrient claims and material performance. A series of experiments were conducted to evaluate the effect of temperature, fertilizer test portion size, and extraction time on the performance of a 74 h accelerated laboratory extraction method to measure SRF and CRF nutrient release profiles. Temperature was the only factor that influenced nutrient release rate, with a highly marked effect for phosphorus and to a lesser extent for nitrogen (N) and potassium. Based on the results, the optimal extraction temperature set was: Extraction No. 1—2:00 h at 25°C; Extraction No. 2—2:00 h at 50°C; Extraction No. 3—20:00 h at 55°C; and Extraction No. 4—50:00 h at 60°C. Ruggedness of the method was tested by evaluating the effect of small changes in seven selected factors on method behavior using a fractional multifactorial design. Overall, the method showed ruggedness for measuring N release rates of coated CRFs.

scholarly journals The influence of slow-release fertilizers on potted chrysanthemum growth and nutrient consumption  

2013 ◽  
Vol 59 (No. 9) ◽  
pp. 385-391 ◽  
Author(s):  
L. Kaplan ◽  
P. Tlustoš ◽  
J. Száková ◽  
J. Najmanová
Keyword(s):  
Plant Growth ◽  
Slow Release ◽  
Nutrient Release ◽  
Fertilizer Treatment ◽  
Biomass Growth ◽  
Consumption Level ◽  
Solution Form ◽  
Nutrient Consumption ◽  
Slow Release Fertilizers ◽  
Coated Fertilizer

In a two-year vegetation experiment, the effects of fertilizer with two slow nutrient releasing mechanisms on the growth of outdoor grown potted chrysanthemums (Multiflora group Chrysanthemum × grandiflorum) as well as on their uptake of the nutrients N, P, K, were studied. In this experiment, coated fertilizer with a controlled nutrient release effect (CRF) – Basacote 6M and fertilizer with a slow soluble nutrients (SRF) – Lovogreen NPK were tested. In the control variant, Kristalon Blue fertilizer was regularly applied in a solution form. From this experiment, the suitability of a onetime application of a slow nutrient – releasing fertilizer to potted chrysanthemums was ascertained. The fertilizers with a slow nutrient release effect were shown to ensure better plant growth during vegetation as well as a higher biomass weight and nutrient consumption level. From the onset of vegetation, the highest rates of biomass growth and nutrient consumption by plants were evident in the (CRF) – Basacote 6M fertilizer treatment.

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