Release of Urea by Granules of Sulfur‐Coated Urea

Jarrell, W. M.; Boersma, L.

doi:10.2136/sssaj1980.03615995004400020042x

Cited by 42 publications

(16 citation statements)

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“…N was released more steadily from PCU than from SCU, indicating that PCU had better controlled release properties of N [ 57 , 58 , 59 ]. Other studies have shown that the N release profile of PCU in the soil could be inferred from the N released in water at 25 °C [ 44 , 60 ]. It has also been shown that SCU granules release urea in the soil faster than in solution [ 60 ].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Controlled Release Urea on the Dynamics of Nitrate, Ammonium, and Its Nitrogen Release in Black Soils of Northeast China

Tong

Duan

et al. 2018

IJERPH

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Controlled release urea (CRU) is considered to enhance crop yields while alleviating negative environmental problems caused by the hazardous gas emissions that are associated with high concentrations of ammonium (NH4+) and nitrate (NO3−) in black soils. Short-term effects of sulfur-coated urea (SCU) and polyurethane-coated urea (PCU), compared with conventional urea, on NO3− and NH4+ in black soils were studied through the buried bag experiment conducted in an artificial climate chamber. We also investigated nitrogen (N) release kinetics of CRU and correlations between the cumulative N release rate and concentrations of NO3− and NH4+. CRU can reduce concentrations of NO3− and NH4+, and PCU was more effective in maintaining lower soil NO3−/NH4+ ratios than SCU and U. Parabolic equation could describe the kinetics of NO3− and NH4+ treated with PCU. The Elovich equation could describe the kinetics of NO3− and NH4+ treated with SCU. The binary linear regression model was established to predict N release from PCU because of significant correlations between the cumulative N release rate and concentrations of NO3− and NH4+. These results provided a methodology and data support for characterizing and predicting the N release from PCU in black soils.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Controlled Release Urea on the Dynamics of Nitrate, Ammonium, and Its Nitrogen Release in Black Soils of Northeast China

Tong

Duan

et al. 2018

IJERPH

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“…Research clearly shows that soil temperature usually has the greatest influence on N release from polymer-coated urea fertilizer (Christianson 1988;Gandeza, Shoji, and Yamada 1991;Huett and Gogel 2000;Oertli and Lunt 1962). Jarrell and Boersma (1980) reported the diffusion rate and solubility of sulfur-coated urea fertilizer increased as temperature increased. Results from our experiment also showed that soil temperature had the greatest influence on N release from ESN.…”

Section: Discussionmentioning

confidence: 99%

Nitrogen Release from Environmentally Smart Nitrogen Fertilizer as Influenced by Soil Series, Temperature, Moisture, and Incubation Method

Golden

Slaton²,

Norman³

et al. 2011

Communications in Soil Science and Plant Analysis

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Environmentally Smart Nitrogen (ESN) is a polymer-coated urea fertilizer with potential to increase crop recovery of fertilizer nitrogen (N). Our research objectives were to characterize ESN N retention across time as affected by soil series, temperature, moisture, and incubation method. A rumen bag containing 38 to 44 mg ESN N was placed in 400 g soil, and the amount of ESN N remaining in prills was measured every 5 d for 40 d. Soil was incubated at 25 • C and 250 g H 2 O kg −1 soil, except in experiments where soil temperature or moisture was varied. Nitrogen retention in ESN was linear for three silt and sandy loams and curvilinear in two clayey soils with retention declining more rapidly in clayey soils. Soil temperature had the greatest effect on N retention with the rate of ESN N release increasing as soil temperature increased. Near complete release of ESN N was achieved by 40 d with temperatures ≥ 20 • C.

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“…In later work, it was noted that use of the microbicide was often discontinued (Shirley and Meline, 1975). N release from SCU is affected by soil temperature, soil water content, microorganism activity, and coating characteristics (Jarrell and Boersma, 1980).…”

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confidence: 99%

Slow-release Nitrogen Fertilizers in Vegetable Production: A Review

Guertal¹

2009

hortte

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Slow-release nitrogen (N) fertilizers offer many potential benefits for vegetable production. In sandy soils, their use may lessen N leaching. If the slow-release fertilizer has a release pattern that matches crop needs, N uptake by the growing crop may become more efficient. Additionally, if slow-release fertilizers can be applied as a preplant application, production costs could be lessened, eliminating the need for multiple applications of soluble N fertilizer. Synthetic slow-release fertilizers can be separated into two general groups: those that are slow release as a byproduct of a chemical reaction (such as urea-formaldehyde), and those that are slow release via a sulfur, wax, or resin coating around the fertilizer prill. In vegetable crop research, much of the available literature has focused on use of sulfur coat urea and urea-formaldehyde, as they have been in the fertilizer market for 40 years. Newer research has evaluated resin-coated products. In most studies, use of slow-release N fertilizers as a preplant treatment did not decrease crop yield, but yield was rarely increased when compared with standard split applications of soluble N. Based on available research, the benefits of using slow-release N fertilizers in vegetable crop production will come from reduced environmental risk and savings in production costs.

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Release of Urea by Granules of Sulfur‐Coated Urea

Cited by 42 publications

References 0 publications

Evaluation of Controlled Release Urea on the Dynamics of Nitrate, Ammonium, and Its Nitrogen Release in Black Soils of Northeast China

Evaluation of Controlled Release Urea on the Dynamics of Nitrate, Ammonium, and Its Nitrogen Release in Black Soils of Northeast China

Nitrogen Release from Environmentally Smart Nitrogen Fertilizer as Influenced by Soil Series, Temperature, Moisture, and Incubation Method

Slow-release Nitrogen Fertilizers in Vegetable Production: A Review

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