AI SearchAssessment and utilization of biologically fixed nitrogen by duckweed (Lemna sp.) for hydroponic lettuce production (Record no. 8944)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 03792nas|a2200421 a 4500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20260817163509.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 071019s2006 th uu|m rtt 0| a1eng d |
| 035 ## - SYSTEM CONTROL NUMBER | |
| System control number | .b11891154 |
| 099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | AIT Thesis no.AS-06-17 |
| 100 1# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Jeyakumar, Kirijah |
| 245 10 - TITLE STATEMENT | |
| Title | Assessment and utilization of biologically fixed nitrogen by duckweed (Lemna sp.) for hydroponic lettuce production |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Place of publication, distribution, etc. | Pathum Thani, Thailand : |
| Name of publisher, distributor, etc. | Asian Institute of Technology, |
| Date of publication, distribution, etc. | 2006 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 69 leaves : |
| Other physical details | ill. |
| 490 1# - SERIES STATEMENT | |
| Series statement | Thesis ; |
| Volume/sequential designation | no. AS-06-17 |
| 500 ## - GENERAL NOTE | |
| General note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (M.Sc.) - Asian Institute of Technology, 2006 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | This study was conducted at the Agricultural Systems Research Farni during October 2005 to March 2006. The objectives of the study arc to determine the potential of duckweed to fix atmospheric N and released to its media and to explore the potential to use such N for crop production using lettuce through hydroponics to reduce fertilizer use. The study had two experiments; the first was the quantification on N contribution by different population of duckweed. This study used five duckweed populations and a control (with no duckweed). There was a highly significant (p=0.05) effect of duckweed populations on anmnionium-N (NH.,}-N) Nitrate-N (N03'-N) concentrations. Duckweed initially increased its population, but degeneration commenced at 21 days in higher populations and lower populations it began later (35 days). The second study had seven flow rates of circulating water from duckweed grown containers. Lettuce was grown using N from duckweed only and a control without duckweed was included. The marketable head yield of lettuce of the control treatment was 1153 kg /4 m unit. The treatment that had a flow rate of 300 1/hr gave a 192 g/4 m unit, which is the highest among the duckweed supported treatments. Based on the N in lettuce, a water surface area of 1.4 m2 was found adequate to satisfy all the N requirement of lettuce in a 4 m unit in 20 days. The N contribution by duckweed towards the yield of lettuce at 200 1/hr rate was 95.95 mg/ hydroponic unit, while 121.87 nig was from 300 I/hr rate within a 20-day period. The projected N levels contributed by duckweed were in the range of 87.5 to 111 kg/ha/yr. This shows remarkable benefits from incorporating duckweed as a biological N fixer to hydroponic production of lettuce |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Hydropronics |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Duckweeds |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Ranamukhaarachchi, S.L., |
| Relator term | Chairperson |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Jayasuriya, H.P.W., |
| Relator term | Examination Committee |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Clemente, Roberto S., |
| Relator term | Examination Committee |
| 710 2# - ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Government of Norway (NOARD) and AIT fellowship, |
| Relator term | Scholarship donor |
| 810 2# - SERIES ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Asian Institute of Technology. |
| Title of a work | Thesis ; |
| Volume/sequential designation | no. AS-06-17 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Materials specified | Full-Text |
| Uniform Resource Identifier | <a href="http://203.159.5.9/ait-thesis/detail.php?q=B09887">http://203.159.5.9/ait-thesis/detail.php?q=B09887</a> |
| 907 ## - LOCAL DATA ELEMENT G, LDG (RLIN) | |
| a | .b11891154 |
| b | mnait |
| c | u |
| 902 ## - LOCAL DATA ELEMENT B, LDB (RLIN) | |
| a | 240404 |
| 998 ## - LOCAL CONTROL INFORMATION (RLIN) | |
| Operator's initials, OID (RLIN) | 0 |
| Cataloger's initials, CIN (RLIN) | 071019 |
| First date, FD (RLIN) | m |
| -- | a |
| -- | u |
| -- | 0 |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnait |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnarc |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 20-AIT Publication |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 40-Archives |
| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050120385066 |
| CREATED | CREATED : 2002-01-03 |
| RECORD Id | RECORD # : i12344011 |
| LPATRON | LPATRON : 1027407 |
| LCHKIN | LCHKIN : 2017-01-27 |
| RENEWALS | # RENEWALS : 0 |
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| -- | IUSE3 : 0 |
| -- | TOT CHKOUT : 6 |
| -- | TOT RENEW : 1 |
| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050120684476 |
| CREATED | CREATED : 2006-05-22 |
| RECORD Id | RECORD # : i12543640 |
| LPATRON | LPATRON : 1014413 |
| LCHKIN | LCHKIN : 2008-01-02 |
| RENEWALS | # RENEWALS : 0 |
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| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : 30050120359855 |
| CREATED | CREATED : 2016-09-06 |
| RECORD Id | RECORD # : i13028819 |
| LPATRON | LPATRON : 0 |
| LCHKIN | LCHKIN : - |
| RENEWALS | # RENEWALS : 0 |
| -- | # OVERDUE : 0 |
| -- | IUSE3 : 0 |
| -- | TOT CHKOUT : 0 |
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| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Cost, normal purchase price | Total checkouts | Full call number | Barcode | Date last seen | Copy number | Price effective from | Koha item type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 17/08/2026 | 50.00 | AIT Thesis no.AS-06-17 | 30050120385066 | 17/08/2026 | 1 | 17/08/2026 | 20-AIT Publication | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | AIT Publications | 17/08/2026 | 50.00 | AIT Thesis no.AS-06-17 | 30050120684476 | 17/08/2026 | 2 | 17/08/2026 | 20-AIT Publication | ||||
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 17/08/2026 | AIT Thesis no.AS-06-17 | 30050120359855 | 17/08/2026 | 17/08/2026 | 40-Archives |