MARC details
| 000 -LEADER |
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| fixed length control field |
03133nam a22004097a 4500 |
| 001 - CONTROL NUMBER |
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| control field |
G70405 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
MX-TxCIM |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
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| control field |
20240827180235.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
121211s ||||f| 0 p|p||0|| | |
| 020 ## - INTERNATIONAL STANDARD BOOK NUMBER |
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| International Standard Book Number |
92-9146-058-3 |
| 040 ## - CATALOGING SOURCE |
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| Original cataloging agency |
MX-TxCIM |
| 072 #0 - SUBJECT CATEGORY CODE |
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| Subject category code |
E10 |
| 072 #0 - SUBJECT CATEGORY CODE |
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| Subject category code |
F04 |
| 090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN) |
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| Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) |
Look under series title |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
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| 9 (RLIN) |
724 |
| Personal name |
Tanner, D.G. |
| Affiliation |
Regional Wheat Workshop for Eastern, Central and Southern Africa, 10; University of Stellenbosch, South Africa; 14-18 Sep 1998 |
| 110 2# - MAIN ENTRY--CORPORATE NAME |
|---|
| Corporate name or jurisdiction name as entry element |
Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Addis Ababa (Ethiopia) |
| 245 00 - TITLE STATEMENT |
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| Title |
Determination of economic optimum fertilizer levels using discrete and continuous analytical methods |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) |
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| Place of publication, distribution, etc. |
Addis Ababa (Ethiopia) |
| Name of publisher, distributor, etc. |
CIMMYT : |
| Date of publication, distribution, etc. |
1999 |
| 340 ## - PHYSICAL MEDIUM |
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| Material base and configuration |
Printed |
| 520 ## - SUMMARY, ETC. |
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| Summary, etc. |
The determination of economic optimum fertilizer rates is fundamental to profitable bread wheat (Triticum aestivum) production. However, the derivation of economic optimum nutrient rates is complex and is dependent upon fluctuating nutrient and grain prices and changing crop management practices. Economic optimum N and P205 nutrient rates were determined following discrete and continuous analytical methods using data generated in a series of on-farm fertilizer trials conducted in Ethiopia during 1988-90 and 1995-97 across a range of agro-ecologies. The data were first subjected to ANOVA and then regression coefficients derived from response surface equations were used to determine the continuous economic optimum fertilizer rates. Discrete analysis of the actual N-P205 treatments following partial budget methodology was used to determine the discontinuous economic optimum rates. Optimum N and P205 levels for each agro-ecological zone were established based on specified ranges for nutrient and grain prices using both methods. The optimum rates generated by the two analytical methods lacked close agreement for the obvious reason that the continuous method is based on a smoothed regression curve while the discrete method is based on actual data points. However, the relative ratios of N and P205 rates were generally consistent between the two methods. The use of regression-derived response coefficients in continuous economic analysis facilitates the construction of dynamic and robust recommendation tables for dissemination to extension staff. Furthermore, the continuous method facilitates interpolation thereby accommodating intermediate price levels. |
| 546 ## - LANGUAGE NOTE |
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| Language note |
English |
| 591 ## - CATALOGING NOTES |
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| Affiliation |
0007|AGRIS 0101|R99-00CIMPU|AL-Wheat Program|AL-Economics Program |
| 595 ## - COLLECTION |
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| Collection |
CIMMYT Publications Collection |
| 650 17 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name as entry element |
Crop management |
| Miscellaneous information |
AGROVOC |
| 9 (RLIN) |
1061 |
| 650 17 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Economic analysis |
| Miscellaneous information |
AGROVOC |
| 9 (RLIN) |
1088 |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Ethiopia |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Fertilizer application |
| 9 (RLIN) |
1110 |
| 650 17 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Fertilizers |
| Miscellaneous information |
AGROVOC |
| 9 (RLIN) |
1111 |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Prices |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Production factors |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| 9 (RLIN) |
1296 |
| Topical term or geographic name as entry element |
Triticum aestivum |
| Miscellaneous information |
AGROVOC |
| 653 0# - INDEX TERM--UNCONTROLLED |
|---|
| Uncontrolled term |
CIMMYT |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Asefa Taa, |
| Relator term |
coaut. |
| 9 (RLIN) |
416 |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| Personal name |
Kefyalew Girma, |
| Relator term |
coaut. |
| 9 (RLIN) |
155 |
| 856 4# - ELECTRONIC LOCATION AND ACCESS |
|---|
| Link text |
Open Access through DSpace |
| Uniform Resource Identifier |
http://hdl.handle.net/10883/1244 |
| Materials specified |
Complete source through Dspace |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
|---|
| Koha item type |
Conference proceedings |
| Source of classification or shelving scheme |
Dewey Decimal Classification |