Urea-Formaldehyde Fertilizers, Solubility Relationships and Nitrification Characteristics of Urea-Form

Clark, K. G.; Yee, Jet; Gaddy, V. L.; Lundstrom, F. O.

doi:10.1021/jf60060a002

Cited by 14 publications

(10 citation statements)

References 10 publications

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“…The nature of this reaction is not known with certainty. West and Lyles (6) believed that a nitro derivative of chromotropic acid was formed, in a manner similar to the nitration of phenoldisulfonic acid. More than one product may be formed with some samples of chromotropic acid.…”

Section: Chromotropic Acid-nitrate Reactionmentioning

confidence: 99%

Nitrogen Availability, Nitrification of Fractions from Commercial Ureaforms

Hays¹,

Haden²,

Anderson³

1965

J. Agric. Food Chem.

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Three commercial ureaforms have been fractionated by use of the cold and hot water solubility procedures used in the activity index determination. Approximately equal fractions-cold water-soluble, cold water-insoluble but hot water-soluble, and hot water-insoluble-were nitrified at rapid, intermediate, and slow rates, respectively. Good agreement was obtained in comparing nitrification rates of these ureaforms with the values obtained by recombination of their fractions, showing that the fractions were not greatly changed by the fractionation procedure and had no significant effect on each other in nitrification. The effect of granule size on nitrification rate is much less for commercial ureaforms than for other insoluble nitrogen sources such as oxamide or magnesium ammonium phosphate. While affected by granule size to some extent, ureaforms show their characteristic nitrogen release pattern, even when finely divided.

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Section: Chromotropic Acid-nitrate Reactionmentioning

confidence: 99%

Nitrogen Availability, Nitrification of Fractions from Commercial Ureaforms

Hays¹,

Haden²,

Anderson³

1965

J. Agric. Food Chem.

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“…Nitrification studies with several of the metal ammonium phosphates were conducted following procedures similar to those described by Clark et at. (7). The results of one experiment are shown in Figure 2.…”

Section: Agronomic Characteristicsmentioning

confidence: 99%

Micronutrient Sources, Metal Ammonium Phosphates as Fertilizers

Bridger¹,

Salutsky²,

Starostka³

1962

J. Agric. Food Chem.

137

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Deficiency in corn causes a shortening of the internodes of corn and a severe stunting.A typical zinc-deficient plant is shown in Figure 9. When the deficiency is severe, many corn plants will die in the seedling stage, with those recovering exhibiting several different colorations and symptoms ranging from a lack of green color in the upper leaves to interveinal striping in the upper leaves. Severe zinc deficiency in corn is known as "white bud."Zinc deficiencies are corrected by soil applications of zinc sulfate and zinc chelates in the case of row crops, and by spray as well as soil applica-

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“…This review article will summarize that body of work, discussing research in the use of slow-release N fertilizers in vegetable production. formaldehyde in the presence of a catalyst to form a white, odorless solid that contained about 38% N (Clark et al, 1956). Ureaforms were first sold as fertilizers in 1955 (Olson, 1971).…”

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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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Urea-Formaldehyde Fertilizers, Solubility Relationships and Nitrification Characteristics of Urea-Form

Abstract: to 71%. Under the same conditions, kaolinitic and montmorillonitic clays, fuller's earth, and phosphate by-product with bulk densities in the range 23 to 40 pounds per cubic foot effected reductions in the range 29 to 41%. Calcium car-

Cited by 14 publications

References 10 publications

Nitrogen Availability, Nitrification of Fractions from Commercial Ureaforms

Nitrogen Availability, Nitrification of Fractions from Commercial Ureaforms

Micronutrient Sources, Metal Ammonium Phosphates as Fertilizers

Slow-release Nitrogen Fertilizers in Vegetable Production: A Review

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