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Controlled release nitrogen fertilizers


, : Controlled release nitrogen fertilizers. Manual of Fertilizer Processing , Fertilizer Science and Technology Series, 5: 421-435

The types of commercial controlled release fertilizers used by the manufacturer of mixed fertilizers are: (1) processed natural organics; (2) the urea-formaldehyde family-solid ureaform, methyleneureas generated by in situ condensation, and urea-formaldehyde suspensions and solutions; (3) sulfur-coated urea; and (4) isobutylidenediurea from urea and isobutyraldehyde.

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Related references

Broschat, T., K.; Moore, K., K., 2007: Release rates of ammonium-nitrogen, nitrate-nitrogen, phosphorus, potassium, magnesium, iron, and manganese from seven controlled-release fertilizers. Samples of seven controlled-release fertilizers, Nutricote Total 13-13-13, Nutricote Total 18-6-8, Osmocote Plus 15-9-12, Osmocote 13-13-13, Polyon 18-6-12, Polyon 14-14-14, and Plantacote 14-8-15, were placed in leaching columns containing acid-...

Cabrera, Ri, 1997: Comparative evaluation of nitrogen release patterns from controlled-release fertilizers by nitrogen leaching analysis. Seven nursery grade (8-9 month duration), polymer-coated, controlled-release fertilizers (CRF) were topdressed or incorporated into a 2 peat : 1 vermiculite : 1 sand (by volume) medium to yield the same amount of N per container. The pots (0.5 L)...

Okitsu, S.; Honda, F., 1982: Rational fertilization, based on leaching in open-air culture of vegetables. II. Effect of controlled-release nitrogen fertilizers and liquid nitrogen fertilizers on yield of heading leafy vegetables. During the initial stages of heading in lettuce, cabbage and Chinese cabbage, a very high level of soil N was required, and a basal dressing of solid inorganic N fertilizer with a top dressing of liquid N gave the best yields. Controlled-release N...

Patel, A.J.; Sharma, G.C., 1977: Nitrogen release characteristics of controlled-release fertilizers during a four month soil incubation. Fertilizers were mixed in Morrison sandy loam at 250 and 500 mg N/500 g soil in columns eluted at intervals for up to 121 days to evaluate their N-release characteristics. During the first week, N leached ranged from a low of 2% for sulfur-coated...

Patel, A.J.; Sharma, G.C., 1977: Nitrogen release characteristics of controlled release fertilizers during a 4 month soil incubation. Fertilizers were mixed in Morrison sandy loam at 250 and 500 mg N/500 g soil. Columns were kept under uniform environmental conditions and eluted at 3, 5, 7, 14, 21, 28, 35, 49, 63, 77, 91 and 121 days to evaluate their N-release characteristics....

Zhang, M.; Nyborg, M., 1992: Nitrogen release rate from controlled-release nitrogen fertilizers. Canadian Journal of Soil Science 72(3): 352-353

Ristvey, A.; Lea Cox, J., 2000: Nitrogen and phosphorus release from controlled-release fertilizers while overwintering nursery stock under plastic. Hortscience 35(3): 456, June

Patel A.J.; Sharma G.C., 1976: Nitrogen release characteristics of 14 controlled release fertilizers during a 4 month soil incubation period. Hortscience 11(3 SECT 2): 317

Birrenkott, B.; Craig, J.; Mcvey, G., 2005: A leach collection system to track the release of nitrogen from controlled-release fertilizers in container ornamentals. A leach collection unit (LCU) was assembled to capture all leachate draining from a nursery container. An injection molded 2.8-L nursery container was plastic welded into the lid of a 7.6-L black plastic collection bucket so that the bottom 2.5 cm...

Lorenz, O.A.; Weir, B.L.; Bishop, J.C., 1972: Effect of controlled-release nitrogen fertilizers on yield and nitrogen absorption by potatoes, cantaloupes, and tomatoes. In field studies with cantaloupes and tomatoes, using N sources banded in the soil, the highest yields were obtained with (NH4)2SO4. Yields with urea-formaldehyde and S-coated urea were similar to each other, and less than those from urea. Control...