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	Duckweed Aquaculture
		Duckweed grown under ideal conditions and harvested regularly will have a fiber content of 5 to 15 percent and a protein content of 35 to 45 percent, depending on the species involved, as illustrated in figure 2.
		Duckweed Farm The principal objective of the duckweed farm is to produce as much usable, harvested duckweed as possible while also maximizing net returns from the process.
		Duckweed as a mineral sink Duckweed is a crop whose micronutrient requirements are substantial, so much so, in fact, that waterlogged, salinized soils, which are an important constraint on irrigated agriculture worldwide, may be a favorable environment for duckweed cropping.
	www.p2pays.org /ref/09/08875.htm (18064 words)

	DUCKWEED
		Duckweeds grow at water temperatures between 6 and 33° C. Growth rate increase with water temperature, but there is an upper limit of water temperature around 30° C when growth slows and at higher temperature ceases.
		Duckweeds appear to be able to use a number of nitrogenous compounds either on their own or through the activities of associated plant and animal species.
		Duckweeds appear to concentrate P up to about 1.5% of their dry weight and as such are able to grow on high P waters provided the N concentrations are maintained.
	www.fao.org /ag/aga/AGAP/FRG/DW/Dw2.htm (12309 words)

	D:\CDEnglish\Biogas\10text.htm
		The duckweed pond is connected by a pipe with the exit of the biodigester.
		The inoculum of duckweed is prepared and distributed on the pond surface at the rate of 400 g/m².
		Mixing fresh duckweed with either rice bran or cassava root meal, or with a combination of the two, produces a feed with a crumbly texture that is more readily accepted by chickens than any one of the ingredients given separately.
	www.fao.org /ag/aga/agap/frg/Recycle/dweed/mandw.htm (2096 words)

	fishfarming.com - experts in aquaculture, fish farming, shrimp aquaculture and tilapia farming
		Duckweed is the common name for a family of small aquatic herbs known as Lemnaceae that grows in fresh water.
		Duckweed is ubiquitous to most temperate and tropical regions of the world, making it readily available to most farmers.
		Duckweed protein has high concentrations of the essential amino acids lysine and methionine and is also high in trace minerals and pigments.
	www.fishfarming.com /recirc.html (1047 words)

	Controlling Duckweed In The Aquarium
		Lima minor, or duckweed as it is better known, grows on ponds and still waters world-wide.
		Although propagating duckweed is regarded as a sign of good water quality, since a single piece of duck weed spreads so quickly, this lovely little plant is often classed as a pest.
		The simplest method of controlling duckweed is to scoop out every single piece with a net however, I have found that inevitably, one will miss a bit or leave some on the net and soon the surface is riddled with the plant once again.
	www.thatfishshop.com /aquaticplants/duckweed.htm (350 words)

	Duckweed versus Soybean meal as protein source for feeding scavenging local chickens in the integrated farming system
		The amounts of fresh duckweed eaten were: 36 ±0.35 and 49 ±0.22 g/day and of ground soya beans 27±0.35 and 28±0.22 g/day for station and farm, respectively.
		The average amounts of fresh duckweed eaten were: 36 ±0.35 and 49 ±0.22 g/day and of ground soya beans were 27 ±0.35 and 28 ±0.22 g/day for station and farm, respectively.
		They reported intakes of fresh duckweed by laying hens of over 200 g/day when the duckweed was offered in a mixture of equal parts of duckweed with rice bran compared with only 32 g/day of duckweed when these two feeds were offered on free access basis.
	www.cipav.org.co /lrrd/lrrd11/1/sam111.htm (3417 words)

	Environmental Inquiry - Bioassays Using Duckweed
		Duckweed it is a small aquatic plant that floats on the surface of ponds, wetlands, and nutrient-rich lakes.
		Duckweed is useful for conducting bioassay experiments with water samples because you can measure its growth rate by counting how many new fronds develop over a five-day period.
		By measuring the number of new fronds on duckweed plants growing in a test solution and comparing that to the number of new fronds in a control solution, you can test the sensitivity of duckweed to different compounds, or various concentrations of a single compound.
	ei.cornell.edu /toxicology/bioassays/duckweed (208 words)

	The Role of Scientists in the Professional Development of Science Teahcers
		duckweed to that of the pond or stream algae.
		The duckweed floats on the surface of the water and is made of 1-4 lobes.
		Sketch the arrangement of the lobes on the duckweed.
	www.nap.edu /readingroom/books/role/apph1.html (765 words)

	Biology and Control of Duckweed With Herbicides (Site not responding. Last check: 2007-10-09)
		Seen from a distance, it is difficult to distinguish individual plants in a body of water infested with duckweed because the surface of the water appears green.
		The size of the fronds of the Common Duckweed generally ranges from 0.070 to 0.16 in (1.7 to 4.0 mm) in length and from 0.032 to 0.16 in (0.80 to 4.0 mm) in width.
		The size of the fronds of Giant Duckweed generally ranges from 0.079 to 0.28 in (2.0 to 7.0 mm) in length and from 0.039 to 0.24 in (1.0 to 6.0 mm) in width.
	edis.ifas.ufl.edu /AG143 (2699 words)

	The Lemnaceae (Duckweed Family)
		Note: Some authorities consider the duckweeds to be monoecious species with one or two staminate flowers (each consisting of one stamen) and one pistillate flower (consisting of a single pistil) on the same plant body.
		It has been estimated that 10 acres of duckweeds could theoretically supply 60 percent of the nutritional needs of 100 dairy cows, the manure of which could be recycled to provide fertilizer for the thriving duckweeds.
		In fact, duckweeds are often used to test the toxicity of herbicides and to detect the presence of herbicides in water.
	waynesword.palomar.edu /1wayindx.htm#key (6669 words)

	Ivy Leaf Duckweed, Lemna trisulca
		With the entire body of the duckweed composed of non-structural, metabolically active tissue, most photosynthesis is devoted to the production of protein and nucleic acids, making them very high in nutrional value.
		Duckweeds are useful as a water crop as they can acclimatize themselves to almost all growing conditions, with some thriving in manure-rich or eutrophic waters.
		Duckweeds have potential in wastewater treatment, absorbing excess nutrients from surface waters, including phosphorus and ammonias, reducing suspended solids, and reducing biochemical oxygen demand.
	www.rook.org /earl/bwca/nature/aquatics/lemnatris.html (882 words)

	Lesser Duckweed, Lemna minor
		Family Lemnaceae, the Duckweeds As a result of their adaptation to aquatic habitats, they are among the smallest and simplest of the flowering plants, floating monocotyledons, only 1-15mm in size.
		Floating duckweed plants are relatively easy to remove by skimming or are eaten by herbivorous fish.
		Wind and wave action can impede duckweed growth and stabilization by disrupting their ability to attach themselves to each other and form their characteristic homogenous colonial populations.
	www.rook.org /earl/bwca/nature/aquatics/lemna.html (1051 words)

	Lemna minor (lesser duckweed) and Lemna trisulca (star duckweed) (Site not responding. Last check: 2007-10-09)
		Duckweeds are among the world’s smallest flowering plants.
		Individual lesser duckweed plants are tiny, round, bright green disks, each with a single root.
		Individual nonflowering plants are longer and narrower than lesser duckweed, commonly floating in masses beneath the water surface.
	www.ecy.wa.gov /programs/wq/plants/plantid2/descriptions/lemmin.html (381 words)

	index (Site not responding. Last check: 2007-10-09)
		Duckweed is a family of floating aquatic plants with the scientific name
		Duckweed normally reproduces by budding (a form of asexual reproduction) although it is capable of sexual reproduction as well.
		Duckweed may be the most promising plant for the twenty-first century for the following
	www.geocities.com /RainForest/Canopy/3631 (54 words)

	Duckweed Photos and Information - Water Gardens (Site not responding. Last check: 2007-10-09)
		Duckweed is a tiny water plant with little green leaves.
		Duckweed is actually hundreds to thousands of little tiny plants, all floating together.
		Duckweed can grow very rapidly, though, so make sure that you always keep the majority of your pond surface duckweed-free so that air and sunshine can get in to your water.
	www.bellaonline.com /ArticlesP/art10554.asp (140 words)

	Center for Aquatic and Invasive Plants - Aquatic and Wetland Plant Particulars and Photos (Site not responding. Last check: 2007-10-09)
		Although very small, they are nonetheless sometimes quite noticeable, as when they cover a pond with dense masses.
		Click on the picture on the left to compare the duckweeds.
		Note the centimeter-measure in the picture, remembering that 2.5 cm equals an inch.
	aquat1.ifas.ufl.edu /duckweed.html (108 words)

	The Lemnaceae (Duckweed Family)
		In Spirodela, Landoltia and Lemna it is a flattened structure with slender, hairlike roots on the underside.
		"Landoltia (Lemnaceae), A New Genus of Duckweeds." Novon 9: 530-533.].
		Depending on the genus, daughter plants are produced vegetatively in 2 lateral, flattened, budding pouches (Spirodela, Landoltia & Lemna), a flattened, triangular budding pouch at the basal end (Wolffiella), or a funnel-shaped budding pouch at the basal end (Wolffia).
	waynesword.palomar.edu /1wayindx.htm (6669 words)

	The Role of Scientists in the Professional Development of Science Teahcers (Site not responding. Last check: 2007-10-09)
		Duckweed is a common aquatic plant that can be grown in the lab in a simple nutrient culture medium.
		The growth of these plants occurs by mitosis and can be quantified by counting the number of new buds found on the plant after a period of time.
		In this experiment, you will determine the optimal pH for the growth of duckweed, along with the effects of sub-optimal pH values on the growth of duckweed.
	www.nap.edu /readingroom/books/role/apph2.html (456 words)

	Wetland Plants
		The fronds often lack roots and are 4-10 mm.
		ECOLOGICAL NOTES: Star duckweed is found in quiet waters of lakes and marshes.
		Another name for this plant is forked duckweed.
	www.npwrc.usgs.gov /resource/1998/mnplant/letr.htm (100 words)

	Lemna valdiviana -- Center for Aquatic and Invasive Plants (Site not responding. Last check: 2007-10-09)
		Small duckweed is located throughout the US; and in PR (Kartesz, 1999).
		mall duckweeds are tiny (1/16 to 1/8 inch) green plants with shoe-shaped leaves.
		Small duckweed may be confused with giant duckweed, Spirodela polyrhiza.
	aquat1.ifas.ufl.edu /levapic.html (95 words)

	Duckweed on Flickr - Photo Sharing!
		This is either true, or it's one of those things which I say as though it was true.
		Looks like you might actually have a couple different species of duckweed in there.
		Sign up for a free account, or sign in (if you're already a member).
	www.flickr.com /photos/57767257@N00/3172039 (91 words)

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