MARC details
| 000 -LEADER |
|---|
| fixed length control field |
02980nam a22004217a 4500 |
| 001 - CONTROL NUMBER |
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| control field |
G70404 |
| 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 |
20211006082148.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
|---|
| 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 |
F01 |
| 072 #0 - SUBJECT CATEGORY CODE |
|---|
| Subject category code |
H60 |
| 090 ## - LOCALLY ASSIGNED LC-TYPE CALL NUMBER (OCLC); LOCAL CALL NUMBER (RLIN) |
|---|
| Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) |
Look under series title |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
|---|
| Personal name |
Taye Tessema |
| Affiliation |
Regional Wheat Workshop for Eastern, Central and Southern Africa, 10; University of Stellenbosch, South Africa; 14-18 Sep 1998 |
| 9 (RLIN) |
725 |
| 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 threshold densities for the mayor weed species competing with bread wheat in Ethiopia |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) |
|---|
| Place of publication, distribution, etc. |
Addis Ababa (Ethiopia) |
| Name of publisher, distributor, etc. |
CIMMYT : |
| Date of publication, distribution, etc. |
1999 |
| 340 ## - PHYSICAL MEDIUM |
|---|
| Material base and configuration |
Printed |
| 520 ## - SUMMARY, ETC. |
|---|
| Summary, etc. |
Competition effects of four grass weed species (Avena abyssinica, Lolium temulentum, Snowdenia polystachya, and Phalaris paradoxa) and three broadleaf weed species (Guizotia scabra, Amaranthus retroflexus, and Galium spurium) on he grain yield, yield components and morphological characters of bread wheat (Triticum aestivum) were studied in Ethiopia. The weed species varied significantly in their effects on the number of fertile wheat spikes m-2, grains per spike, thousand grain weight, biomass and grain yield, harvest index and plant height. A. abyssinica and S. polystachya were the most competitive grass weeds, reducing wheat yield components and morphological characters to a greater extent than L. temulentum and P. paradoxa. Grass species by seedling density interaction effects were significant for most of the crop and weed characters measured, indicating a differential rate response for individual species. The reduction in wheat grain yield at the maximum grass weed density of 320 seedlings m-2 ranged from 48 to 86% across the four species studied. Among the three broadleaf weed species, G. scabra exerted the greatest effect on wheat grain yield. The wheat yield reduction at the maximum broadleaf weed seedling density of 160 seedlings m-2 was 47.8,29.6 and 18.6% for G. scabra, A. retroflexus, and G. spurium, respectively. Competitive yield losses were fitted to a rectangular hyperbola model to facilitate the prediction of wheat grain yield loss, and to derive economic thresholds for herbicidal intervention in relation to weed seedling density |
| 546 ## - LANGUAGE NOTE |
|---|
| Language note |
English |
| 591 ## - CATALOGING NOTES |
|---|
| Affiliation |
0007|AGRIS 0101|R99-00CIMPU|AL-Wheat Program|AL-Economics Program |
| 595 ## - COLLECTION |
|---|
| Collection |
CIMMYT Publications Collection |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Cropping patterns |
| 9 (RLIN) |
1067 |
| 650 17 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Economic analysis |
| Miscellaneous information |
AGROVOC |
| Source of heading or term |
|
| 9 (RLIN) |
1088 |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Ethiopia |
| 650 17 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Fertilizers |
| Miscellaneous information |
AGROVOC |
| Source of heading or term |
|
| 9 (RLIN) |
1111 |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Grasses |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Herbicides |
| Miscellaneous information |
AGROVOC |
| 9 (RLIN) |
1808 |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Management |
| 650 17 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Weed control |
| Miscellaneous information |
AGROVOC |
| Source of heading or term |
|
| 9 (RLIN) |
1308 |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Weeds |
| 9 (RLIN) |
1309 |
| 653 0# - INDEX TERM--UNCONTROLLED |
|---|
| Uncontrolled term |
CIMMYT |
| 650 10 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| 9 (RLIN) |
1296 |
| Topical term or geographic name as entry element |
Triticum aestivum |
| Miscellaneous information |
AGROVOC |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
|---|
| 9 (RLIN) |
724 |
| Personal name |
Tanner, D.G. |
| Relator term |
coaut. |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
|---|
| Koha item type |
Conference proceedings |