Download or read book Effects of CO2 Laser on Water Hyacinth Growth written by Katherine S. Long and published by . This book was released on 1975 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aquatic Plant Control Program written by Katherine S. Long and published by . This book was released on 1975 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a result of earlier experiments indicating the possibility of controlling water hyacinths with laser irradiation, a prototype CO2 laser system (10.6-micrometer wavelength) was designed, fabricated, and adapted for use in an outdoor environment. In the fall of 1972, the laser system was tested and evaluated near Bayou Gauche, Louisiana. Deficiencies were discovered in the test of the prototype. A scanning, flat-mirror system was substituted for the spherical-mirror system. A chiller system was installed to dissipate the excessive heat. Finally, the effects of the salt-air environment were eliminated when the system was moved to Lake Concordia, Louisiana, a freshwater inland lake, where in 1973 and 1974 controlled irradiation ranging from 0.2 to 100 J/sq cm was applied to plots of water hyacinth plants collected in the lake. Plant biomass, height, number, coverage, and number of flowers were measured periodically. Results of the analyses show that laser irradiation causes a significant decrease in growth rates with an increase in irradiation level, but this effect decreases as time passes until there is no significant difference between treated and control plots. Rates of photosynthesis were not significantly affected by laser irradiation.

Download or read book Aquatic Plant Control Program written by Richard W. Couch and published by . This book was released on 1972 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary experiments in 1968 indicated that water hyacinths and possibly other aquatic plants could be controlled by 10.6 micron laser radiation. Two effects were noted: an immediate plasmolysis directly proportional to laser energy and a secondary effect at lower levels of irradiation that resulted in death of the plant after a period of time. Studies made in 1969 indicated that split applications of laser energy were not more effective than continuous treatment. Plant count evaluations were significant at a minimum level of 0.5 joules per sqcm(J/sgcm). Histological examination of irradiated leaf tissue did not show extensive cell damage due to laser treatment. Studies made in 1970 indicated that twice-irradiated plants were affected at a level of about 70J/sqcm. (Author).

Download or read book Effects of Field applied Carbon Dioxide Laser Radiation on Waterhyacinth eichhornia Crassipes Mart Solm written by Virginia Rose Van Sickle and published by . This book was released on 1975 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1977 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1983 with total page 1368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book List of Publications of the U S Army Engineers Waterway Experiment Station written by United States. Army. Corps of Engineers and published by . This book was released on 1976 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book List of Publications of the U S Army Engineer Waterways Experiment Station written by U.S. Army Engineer Waterways Experiment Station and published by . This book was released on 1976 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Army Research and Development written by and published by . This book was released on 1974 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1973 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Introduction to the Environmental Literature of the Mississippi Deltaic Plain Region written by and published by . This book was released on 1981 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Report of the Chief of Engineers on Civil Works Activities written by United States. Army. Corps of Engineers. Civil Works Directorate and published by . This book was released on with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Army RD A written by and published by . This book was released on 1974 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Army RD A Bulletin written by and published by . This book was released on 1974 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Hyacinth written by Brij Gopal and published by Elsevier Publishing Company. This book was released on 1987 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is almost impossible for an individual to keep pace with the huge bulk of, not always readily accessible, literature on waterhyacinth which has amassed in recent years. This book provides for the first time a comprehensive bibliography of over 2700 references and a critical review of the current knowledge on all aspects of the plant. Important data on all these aspects have been compiled and presented in numerous tables and figures making the book the most important reference work to date on waterhyacinth. Areas requiring the extra attention of researchers are also indicated. In recent years aquatic weeds such as waterhyacinth have received great attention, not only for the magnitude of problems caused by them in the management of water resources, but also for the promise they hold as a new resource for such diverse uses as animal feed, compost, paper, energy (biogas) and above all the control of water pollution (wastewater treatment). Waterhyacinth outclasses all other aquatic weeds in its rate of growth, multiplication and dry matter production, and its potential ability in respect to energy and pollution control.

Download or read book Aquatic Weeds written by A. H. Pieterse and published by . This book was released on 1990 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new book, published for the European Weed Research Society, provides a detailed overview of the management of aquatic weeds, which cause serious problems in bodies of water throughout the world. This state-of-the-art review includes worldwide coverage of these undesirable organisms. It provides readers with information on the ecology and management of aquatic weeds, as well as in-depth discussion of environmental consequences of weed control methods. Valuable appendix materials give useful listings of the weeds, biological control agents used against aquatic weeds, and herbicides used in fresh waters.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1976 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt: