Nitrogen Fertilizers, Hydrolysis, Nitrification, and Nitrogen Availability of Oxamide, as Influenced by Granule Size

“…Frankenberger and Tabatabai ( 1981) reported that applications of acetamide and propionamide induced amidase activity in soils. The release ofN from oxamide depends on temperature and particle size (Hauck, 1964;DeMent et al, 1961 ). DeMent et al ( 1961) reported that N uptake of oxamide by corn (Zea mays L.) increased from 22 to 89% of that of NH 4 N0 3 as particle size decreased from 4 mm to 0.6 mm.…”

mentioning

confidence: 99%

“…The release ofN from oxamide depends on temperature and particle size (Hauck, 1964;DeMent et al, 1961 ). DeMent et al ( 1961) reported that N uptake of oxamide by corn (Zea mays L.) increased from 22 to 89% of that of NH 4 N0 3 as particle size decreased from 4 mm to 0.6 mm. Dilz and Steggerda (1962) also found rapid hydrolysis of oxamide (5-10 .urn) when incorporated into the soil.…”

mentioning

confidence: 99%

Evaluation of Oxamide as a Slow‐Release Nitrogen Source on Kentucky Bluegrass¹

Mosdell¹,

Daniel²,

Freeborg

1987

Agronomy Journal

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Slow-release N fertilizers are used in turfgrass fertilization programs to reduce foliar burn and N losses, and to extend the response period between applications. In this study, oxamide (31% N), an amide of oxalic acid, and a 7:3 N ratio of oxamide and urea were evaluated as slow release N sources on Kentucky bluegrass (Poa pratensis L.) at West Lafayette, IN, on a Toronto silt loam soil (finesilty, mixed mesic, Udollic Ochraqualfs). Two particle sizes of oxamide, C (1-2.8 mm) and F ( <0.85 mm), were applied as a granular and liquid suspension treatment, respectively. Additional treatments consisted of applying isobutylidene diurea (IBDU), sulfur-coated urea (SCU), and urea. Two and four applications were made, with a total annual application rate of 196 kg N ha~• yr~•. Recovery of N in the tissue from applications of oxamide C was 51% compared to 41, 39, and 38% for IBDU, oxamide F, and SCU, respectively, averaged over 3 yr. Initial change in visual turf quality and clipping yields in response to oxamide C was slow, similar to that of IBDU; however, residual N release was equal to that of IBDU and greater than that of SCU. Adding urea to oxamide C increased initial yields and turf quality but reduced the duration of turf response as compared to applications of oxamide C alone. At two applications of 98 kg N ha~ 1 , oxamide proved to be a good, slow-release source of N. At four applications per year, initial clipping yields resulting from spring oxamide F applications were lower than those from urea, but turf quality in response to residual N tended to be greater than that of urea. Late fall applications of oxamide F reduced soil N03 concentrations shortly after application and in early spring as compared to fall applications of urea. Oxamide F at four applications generally produced a more desirable turf response than did similar applications of urea.Additional index words: Isobutylidene diurea, Sulfur-coated urea, Nitrogen recovery, Soil inorganic nitrogen, Poa pratensis L. Agron. J. 79:720-725 (1987). Published in

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“…The compound contains 31.8% N and is 0.4% soluble in water at 25°C; dissolution rate, however, is an inverse function of pacticle size and hardness 7 . Hydrolysis in water produces oxamic acid in equilibrium with the constituent acid and base, whereas hydrolysis in soil is thought to occur mostly through microbial activity and release of ammonium.…”

Section: Introajcticnmentioning

confidence: 99%