Author: John Matthew Drwal
Publisher:
ISBN:
Category : Nitrogen fertilizers
Languages : en
Pages : 142

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Book Description

Author: Steven Lyle Oberle
Publisher:
ISBN:
Category : Ammonia as fertilizer
Languages : en
Pages : 410

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Author: Charles Michael Reynolds
Publisher:
ISBN:
Category : Ammonia as fertilizer
Languages : en
Pages : 278

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Author: B. R. Bock
Publisher:
ISBN:
Category : Ammonia
Languages : en
Pages : 204

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Book Description
Symposiumverslagen over: de omvang van ureum als meststof op de wereldmarkt; bodem-, milieu- en beheersfactoren die de ammoniakvervluchtiging beinvloeden; factoren die de ureumhydrolyse beinvloeden; de chemische balans m.b.t. de ammoniakvervluchtiging; modelmatige weergave voor het voorspellen van de vervluchtiging; vergelijking van methoden voor ammoniakmetingen; ontwikkelingen omtrent de toepassing van remstoffen bij de urease-vorming; mechanismen bij de urease-vorming; ammoniakvervluchtiging van ureumfosfaatmeststoffen

Author: Richard Bevan Ferguson
Publisher:
ISBN:
Category : Ammonia
Languages : en
Pages : 342

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Author: Sarah K. Del Moro
Publisher:
ISBN:
Category : Agricultural pollution
Languages : en
Pages : 82

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Book Description
Ammonia (NH3) volatilization and loss from nitrogen (N) fertilizer in agriculture negatively impacts crops, farm profitability, human health and surrounding ecosystems where it is deposited. A significant source of NH3 volatilization occurs from surface application of urea on sandy soils with low pH buffering capacity such as those in the semi-arid Columbia Basin region of Oregon and Washington. Ammonia volatilization can be mitigated by using alternative N fertilizers to urea. Effluent from food processing and energy production industries is also used on cropland as an efficient method to conserve water and nutrients. However, NH3 emissions from effluent application have not been quantified. The objectives of this study were to: (i) quantify NH3-N loss from urea vs. alternative N fertilizer products in a micrometeorological field study and laboratory incubation experiment, and (ii) quantify NH3 emissions from effluent applied to crops using an inverse-dispersion micrometeorological method. The fertilizers evaluated in field and laboratory trials included urea, polymer-coated urea, sulfur-coated urea, urea treated with urease inhibitor [N-(n-butyl) thiophosphoric triamide (NBPT)] and ammonium sulfate (AS). Mixed and fused N salts were also evaluated, including a blend of urea and AS and a blend of AS:ammonium nitrate (AN). A modified passive flux method was used to estimate NH3-N loss from fertilizers in the field experiment for 33 d after application. In the lab incubation trial, NH3 was collected in acid for 43 d after application. In the field trial, cumulative NH3-N loss from urea was 47% of N applied. The alternative N fertilizers reduced NH3-N loss in both the field and laboratory, with the exception of the fused urea:AS blend. The reduction of NH3-N loss ranged from 19 to 68% vs. urea in the field, and 16 to 98% vs. urea in the laboratory. In the second study, a backward Lagrangian stochastic (bLS) model was used to calculate NH3 emissions from alfalfa fields receiving effluent water (average 111 mg L−1 total Kjeldahl N content) generated from a potato processor, a dehydrated onion processor, and a cogeneration plant. An ultraviolet-differential optical absorption spectrometer (UV-DOAS) and three-dimensional sonic anemometer were used to monitor NH3 concentrations, wind speed, and temperature for 43 days downwind of the field. The average NH3-N emission rate was 1.4 kg ha−1 d−1 when effluent was applied vs. 0.5 kg ha−1 d−1 during irrigation without effluent. The greatest average NH3-N emission rate of 6.1 kg ha−1 d−1 resulted from alfalfa harvest. These studies provided insight of relative NH3 loss among a variety of alternative N fertilizers to urea. Additional N mass balance research will be required to validate the accuracy of these NH3 loss quantifications. Compared to urea, all of the alternative fertilizers significantly reduced NH3-N loss, with greatest benefit resulting from NO3p− and NH4p+ fertilizer forms (> 60% reduction vs. urea). The average NH3-N emission rate of 1.4 kg ha−1 d−1 observed during effluent application was nearly three times the rate observed from irrigation without effluent. This study confirmed the potential of alternative N fertilizers to reduce NH3 emission in agriculture in conditions favoring NH3 volatilization. This study also confirmed the need to consider NH3 loss when reusing effluent as a nutrient source for crops.

Author: Wade H. Shafer
Publisher: Springer
ISBN: 9780306430398
Category : Science
Languages : en
Pages : 400

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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thougtit that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 31 (thesis year 1986) a total of 11 ,480 theses titles trom 24 Canadian and 182 United States universities. We are sure that this broader base tor these titles reported will greatly enhance the value ot this important annual reterence work. While Volume 31 reports theses submitted in 1986, on occasion, certain univer sities do re port theses submitted in previousyears but not reported at the time.

Author: Kevin McInnes
Publisher:
ISBN:
Category : Ammonia
Languages : en
Pages : 398

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Author: David Alan Claypool
Publisher:
ISBN:
Category : Ammonia as fertilizer
Languages : en
Pages : 200

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Book Description

Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1348

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Book Description
Includes abstracts of the annual meetings of the American Society of Agronomy; Soil Science Society of America; Crop Science Society of America ( - of its Agronomic Education Division).