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.

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.

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.

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.

scholarly journals Influence of Water-soluble and Slow-release Fertilizers on Growth of Pot Carnation in C-Channel Mat Irrigation System

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 770A-770
Author(s):  
Chun Ho Pak* ◽  
Seung Won Kang ◽  
Chiwon W. Lee
Keyword(s):  
Growth Rate ◽  
Slow Release ◽  
Irrigation System ◽  
Dianthus Caryophyllus ◽  
Water Soluble ◽  
Influence Of Water ◽  
Slow Release Fertilizers ◽  
Soluble Fertilizer ◽  
Number Of Branches

The influence of water-soluble fertilizer (WSF, 3 different formulations) and slow-release fertilizer (SRF, Osmocote, 14N-6.2P-11.6K) on the growth and quality of potted carnation (Dianthus caryophyllus cv. Invitation) in a C-channel mat irrigation system was investigated. When fertilized with 0.4, 0.8, or 2.0 g·L-1 of WSF (20N-7.9P-16.6K for weeks 1-4, 13K-0.1P-18.8K for weeks 5-11, and 15N-0P-12.5K for weeks 12-15), the 0.8 g·L-1 solution produced the highest quality plants as determined by total shoot fresh and dry weights, leaf area and number, plant height, and number of branches per pot. The quality of plants grown with 0.4 g·L-1 or 2.0 g·L-1 WSF solution was also commercially acceptable. The growth rate of all plants began to accelerate at around 60 days after treatment started, with some variation with the fertilizer treatments. Plants began to show a reduced growth rate at around 90 days from the treatment when they underwent a phase change from vegetative growth to reproductive growth. Plants grown with SRF alone were less vigorous than those grown with WSF, especially when temperature was lower. Results of this study indicate that high quality pot carnations can be produced, using a reduced amount of fertilizer applied to the C-channel mat irrigation system.

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.

Effects of slow-release fertilizers on growth and on uptake and leaching of nutrients in Kentucky bluegrass turfs established on sand-based root zones

1997 ◽  
Vol 77 (3) ◽  
pp. 433-444 ◽  
Author(s):  
M. E. Engelsjord ◽  
B. R. Singh
Keyword(s):  
Nutrient Uptake ◽  
Slow Release ◽  
Root Zone ◽  
Environmental Concern ◽  
Poa Pratensis ◽  
Kentucky Bluegrass ◽  
Water Soluble ◽  
Root Zones ◽  
Turf Quality ◽  
Slow Release Fertilizers

Sports fields constructed on sand-based root zones are generally permeable to water and nutrients, and potential contaminants of the groundwater. This study was conducted to determine the effect of slow-release and water-soluble fertilizers on growth, nutrient uptake and leaching from a sand-based Kentucky bluegrass (Poa pratensis L.) turf. Two root zone mixtures and two N rates were investigated in two independent lysimeter experiments. In the first experiment (1) the 80:20 sand-peat mixture gave better growth and darker-colored turf than the 60:40 sand-peat mixture. Only RC-NPK and water-soluble NPK treatments in this experiment gave acceptable turf quality for the entire growing season. Frequent application with water-soluble fertilizer or spring application with slow-release carriers gave generally <5 mg L−1 NO3-N in the leachate. In the second experiment (2) application of 300 or 450 kg N ha−1 (either as spring or spring/summer application) as urea-ammonium-nitrate (UAN) (gel) did not give desirable turf growth during the entire period of investigation. Sulfur-coated urea gave generally better turf quality than UAN, but not as good as biweekly compound NPK fertilization. Irrespective of fertilizer N rate, the leaching losses of N varied from 1.1 to 2.9%, giving average NO3-N concentrations in the leachate for all treatments <2 mg L−1. Sandy soil used for sports turf, and fertilized with SCU and RC-NPK, or frequent and small amounts of water-soluble N carriers, appears not to create any serious environmental concern in southern part of Norway where the rainfall is moderate. Key words: Kentucky bluegrass, leaching, nitrogen, nutrient uptake, sand-based rootzone, slow-release fertilizers

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