MARC details
| 000 -LEADER |
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| fixed length control field |
03313nab a22004097a 4500 |
| 001 - CONTROL NUMBER |
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| control field |
G18753 |
| 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 |
20211006084805.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
121211s1997 xxu|||p op||| | eng d |
| 022 ## - INTERNATIONAL STANDARD SERIAL NUMBER |
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| International Standard Serial Number |
1435-0645 |
| 022 ## - INTERNATIONAL STANDARD SERIAL NUMBER |
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| International Standard Serial Number |
1435-0645 (Online) |
| 024 8# - OTHER STANDARD IDENTIFIER |
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| Standard number or code |
https://doi.org/10.2134/agronj1997.00021962008900040004x |
| 040 ## - CATALOGING SOURCE |
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| Original cataloging agency |
MX-TxCIM |
| 041 0# - LANGUAGE CODE |
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| Language code of text/sound track or separate title |
eng |
| 043 ## - GEOGRAPHIC AREA CODE |
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| Geographic area code |
MX |
| 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 |
| Local cutter number (OCLC) ; Book number/undivided call number, CALL (RLIN) |
under journal title |
| 100 1# - MAIN ENTRY--PERSONAL NAME |
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| Personal name |
Chapman, S. |
| 9 (RLIN) |
458 |
| 245 00 - TITLE STATEMENT |
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| Title |
Using a chlorophyll meter to estimate specific leaf nitrogen of tropical maize during vegetative growth |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) |
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| Place of publication, distribution, etc. |
Madison, WI (USA) : |
| Name of publisher, distributor, etc. |
American Society of Agronomy, |
| Date of publication, distribution, etc. |
1997. |
| 340 ## - PHYSICAL MEDIUM |
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| Material base and configuration |
Printed |
| 500 ## - GENERAL NOTE |
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| General note |
Peer review |
| 500 ## - GENERAL NOTE |
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| General note |
Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0002-1962 |
| 520 ## - SUMMARY, ETC. |
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| Summary, etc. |
Chlorophyll meters are used as a quick, inexpensive method of estimating leaf N concentration in both experiments and production fields. Direct use of the meter readings is complicated by effects of crop age and cultivar on leaf N concentration, at least partly due to variation in leaf thickness. Research in rice (Oryza sativa L.) shows that readings can be adjusted to account for these effects, and this study sought to establish whether similar relationships exist for tropical maize (Zea mays L.). Additionally, we examined several aspects of sampling methodology. In several field trials in Mexico in 1994 and at different stages of growth (6, 8, 14 leaves expanded) and for plots with different N treatments (0 N, 21 cultivars; 150 kg N h−1, 7 cultivars), meter readings were taken from five leaves per plot, with five readings near the middle of the leaf blade. Leaf N concentration (g N kg−1 dry matter) was significantly linearly correlated with the meter readings (y = 1.46x − 30.68, r 2 = 0.81), but the coefficients of fit differed greatly across data sets and growth stages. Adjusting the meter readings by dividing by specific leaf weight (SLW, g leaf m−2 leaf) resulted in an improved fit within and across data sets (y = 33.47x − 6.55, r 2 = 0.97). The meter readings were also directly correlated with specific leaf N (SLN, g N m−2 leaf) (y = 0.387x − 0.476, r 2 = 0.92) with no adjustments. Analysis of sampling patterns determined that at least four leaves per plot are needed, with several observations per leaf, and that readings should be taken at a point lying between about 40 and 70% along the leaf length from the leaf base. For scientists and farmers with limited direct access to laboratory analysis for N, the meter provides a cheap and convenient estimate of leaf N per unit leaf area during vegetative growth. |
| 546 ## - LANGUAGE NOTE |
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| Language note |
Text in English |
| 591 ## - CATALOGING NOTES |
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| Affiliation |
9710|EE|R97-98ANALY|Maria|anterior|Fdo|FINAL9798|1 |
| 595 ## - COLLECTION |
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| Collection |
CIMMYT Staff Publications Collection |
| 595 ## - COLLECTION |
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| Collection |
Serials Collection |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name as entry element |
Maize |
| Miscellaneous information |
AGROVOC |
| Source of heading or term |
|
| 9 (RLIN) |
1173 |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name as entry element |
Nitrogen content |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
5218 |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name as entry element |
Plant developmental stages |
| Source of heading or term |
AGROVOC |
| 9 (RLIN) |
5197 |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| Topical term or geographic name as entry element |
Research projects |
| 9 (RLIN) |
1237 |
| Source of heading or term |
AGROVOC |
| 650 #7 - SUBJECT ADDED ENTRY--TOPICAL TERM |
|---|
| 9 (RLIN) |
1314 |
| Topical term or geographic name as entry element |
Zea mays |
| Source of heading or term |
AGROVOC |
| 653 0# - INDEX TERM--UNCONTROLLED |
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| Uncontrolled term |
Tropical maize CIMMYT |
| 700 1# - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Barreto, H. |
| 9 (RLIN) |
5574 |
| 773 0# - HOST ITEM ENTRY |
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| Title |
Agronomy Journal |
| Related parts |
v. 89, no. 4, p. 557-562 |
| Place, publisher, and date of publication |
Madison, WI (USA) : American Society of Agronomy, 1997. |
| Record control number |
444482 |
| International Standard Serial Number |
0002-1962 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
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| Koha item type |
Article |
| Source of classification or shelving scheme |
Dewey Decimal Classification |
| Suppress in OPAC |
No |