geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Effect of urea granule size on ammonia volatilization from surface applied urea


, : Effect of urea granule size on ammonia volatilization from surface applied urea. Fertilizer Research 11(1): 87-96

Urea powder and granules of varying size (1 to 8 mm diameter) were surface applied to a ryegrass/white clover pasture. Evolution of NH3 was measured using a continuous air flow enclosure method. At 30 kg N ha-1, the percentage of urea-N lost as NH3 from powder or granules of 1-2, 3-4, 5.6 and 8 mm diameter was 18, 17, 20, 22 and 32 respectively. As the particle size increased, the rate of urea hydrolysis decreased and delayed the time at which the maximum rate of volatilization occurred. Mineral-N and soil surface pH measurements confirmed that during the period of volatilization, urea moved less than 30 mm from the application point. For the powder and 3-4 mm granule treatments, when the application rate was increased from 30 to 300 kg N ha-1, the percentage of urea-N volatilized increased, but at any particular rate there was no significant difference in percentage loss between the powder and 3-4 mm granules.

US$29.90


Other references

Pivnick, D., 1976: 'Help the new dentist--and we help our dental society'. Dental Survey 52(10): 9-9

Gigineyshvili G.N.; Tabidze D.D., 1970: The subsurface basin of the Bzyb karst massif (the southern slope of the Greater Caucasus). Karst, ground water, Georgia, USSR.

Ross, William F., 1939: The heme-globin linkage of hemoglobin II The molecular weight of the product from carboxyhemoglobin. Minimum molecular wts. for the product from pancreatic digestion of CO Hb were 1060, based on Fe content, and 1300, based on non-dialyzable residue. Data from osmotic pressure detns. and diffusion expts. agreed. The product contained the original...

Eguiguren J.; Schell M.; Kunkel K.; Crist W.M.; Rivera G.K., 1990: Hyperleukocytosis in childhood acute lymphocytic leukemia early complications and response to induction therapy. Proceedings of the American Association for Cancer Research Annual Meeting 31: 196

Trub M.; Mei N., 1991: Effects of periodontal stimulation on vhm neurons in anesthetized rats. In anesthetized rats, mechanical stimulations, the direction and intensity of which could be modified, were applied to the superior incisive while single neurone activities were recorded within the VHM region by means of extracellular glass microe...

Blair, J.M., 1993: A descriptive study of the CE needs of nurses serving adolescents in the community. The purpose of this descriptive study was to develop a two-pronged community education database to improve the quality of response to professionals' self-assessed educational needs. The database was designed to include both the self-assessed...

Hesmer, H., 1952: Control of unwanted woody species and forest weeds with growth-regulating substances.. Summarizes the results of preliminary trials in the Kottenforst of 'Tributon', a new 2, 4-D/2, 4, 5-T ester formulation shortly to be put on the market by the Bayerwerke, Leverkusen. Various concentrations, mixtures and emulsions were ap...

Foote, H.Lew, 1966: The mystery of the disappearing bees. Strong honey bee colonies dwindling rapidly to a mere handful of bees in the fall, leaving abundant stores in the hive, but negligible crawling or dead bees near by, are said to suffer "autumn collapse." This has been serious in several...

Lehnert W., 1983: N iso valeryl alanine and n iso valeryl sarcosine 2 new minor metabolites in iso valeric acidemia. Clinica Chimica Acta 134(1-2): 207-212

MESHCHEROV.K.Kh.; RUDOI.D.G., 1962: Analysis of 625 cases of needle biopsy of the liver. Terapevticheskii Arkhiv 34: 72-78