Soil By Cameron Miller, Alex Bruno, Luc Shay and Brendan Weyhe
Irrigation Methods and U.S./International Programs for the Promotion of Soil Conservation
Irrigation Methods • center pivot • drip • flood • furrow • gravity • rotation • sprinkler • subirrigation • traveling gun • supplemental • surface
Center Pivot • Good for sloped surfaces that aren’t possible with surface methods • Still has the necessity of surface drainage • The common ¼-mile system irrigates 130 acres • It is a towable system • Good for crops such as soy beans
Drip • Sprinklers are about 75% efficient while these are 90% or higher • Easy to install • Easy to design • Inexpensive • Reduces plant disease levels associated with high levels of moisture • Works by applying water slowly directly to soil (with small droplets of water) • Water soaks into soil before it can be evaporated out • Only applied at plants roots (which is where they need it)
Flood • “Low-tech" method of irrigating crops • Basically, collect water in a bucket and pour it onto the fields • Still one of the most popular methods of crop irrigation • Water is pumped or brought to the fields and is allowed to flow along the ground among the crops • This method is simple and cheap, and is widely used by societies in less developed parts of the world as well as in the U.S. • About one-half of the water used ends up not getting to the crops • Traditional flood irrigation can mean a lot of wasted water
Furrow • The same thing as flood but instead of cover the entire soil surface, a a partial surface flooding method of irrigation • Normally used with clean-tilled crops where water is applied in furrows or rows of sufficient capacity to contain the designed irrigation system”
Gravity • Irrigation in which the water is not pumped but flows and is distributed by gravity • Water is conveyed in ditches, then released and allowed to spread over the area • The drawback here is that the water is not evenly distributed • This system is not very suitable for tree and shrub crops.
Rotation • Has been implemented to counter water-shortage problem
Sprinkler • A method of applying irrigation water which is similar to rainfall • Water is distributed through a system of pipes usually by pumping • It is then sprayed into the air and irrigated entire soil surface through spray heads so that it breaks up into small water drops which fall to the ground • Sprinklers provide efficient coverage for small to large areas and are suitable for use on all types of properties • It is also adaptable to nearly all irrigable soils since sprinklers are available in a wide range of discharge capacity
Subirrigation • Also known as seepage irrigation • A method of irrigation where water is delivered to the plant root zone from below the soil surface and absorbed upwards • The excess may be collected for reuse • Subirrigation is used in growing field crops such as tomatoes, peppers, and sugar cane • Used in areas with high water tables such as Florida and in commercial greenhouse operations • Three basic types of subirrigation system are in general use for potted plants in greenhouses: • ebb-and-flow: bench-mounted enclosures holding pots are filled and then drained • trough: water is flowed through bench-mounted, slightly sloping enclosures containing pots • flooded floor: special sloped concrete flooring is flooded and drained
Traveling Gun • Sprinkler irrigation system consisting of a single large nozzle that rotates and is self-propelle • The name refers to the fact that the base is on wheels and can be moved by the irrigator or affixed to a guide wire • Consists of a high capacity sprinkler mounted on a chassis to which a flexible hose is connected (usually 3 to 5 inches in diameter and up to 1320 feet long) • The traveler is pulled along selected travel lanes by a cable or the hose wrapping on a rotating reel. • The reel can be powered by a water turbine, water piston, or engine drive • The cable reel pulls the traveler through the field in a straight line. • Adapted to irregularly shaped fields • The costs are moderate and require less labor than other methods • Require high operating pressures and high power pumping units. • Alleyways are required in the crop. • Wind seriously affects the distribution pattern.
Supplemental irrigation (SI) • Highly efficient practice • Great potential for increasing agricultural production and improving the dry rainfed areas • In the drier environments most of the rainwater is lost by evaporation • The rainwater productivity is extremely low • Water harvesting can improve agriculture by directing and concentrating rainwater through runoff to the plants and other beneficial uses • Over 50% of lost water can be recovered at a very little cost • Environmental benefits of this practice are far more important than increasing agricultural water productivity.
Surface • Systems apply water rapidly to a level or nearly level area enclosed by dikes • Accurate land leveling makes this system much more efficient and effective • This system is used extensively in the cranberry bogs for: • frost control • freeze protection • bog management • irrigation. • Water is retained at a uniform depth until it has been: • taken into the soil • has served its purpose of preventing freezing or frost damage • the water harvesting is complete
U.S./International Programs for the Promotion of Soil Conservation • -The Food Security Act of 1985 • -The Conservation Reserve Program • -Federal Agricultural Improvement and Reform Act (“freedom to farm act”) • Environmental Quality Incentive Program • Natural Resources Conservation Foundation
The Food Security Act of 1985- • Contains provisions designed to discourage the conversion of wetlands into non-wetland areas • These provision are commonly referred to as the "Swampbuster" provisions • Denied Federal farm program benefits to producers who converted wetlands after December 23, 1985 • The Food, Agriculture, Conservation, and Trade Act of 1990 strengthened Swampbuster by making violators ineligible for farm program benefits for that year and subsequent years • Created a system for inadvertent violations allowing farmers to regain lost Federal benefits if they restore converted wetlands
The Conservation Reserve Program • The Conservation Reserve Program (CRP) • Provides technical and financial assistance to eligible farmers and ranchers to address soil, water, and related natural resource concerns on their lands in an environmentally beneficial and cost-effective manner • Provides assistance to farmers and ranchers in complying with Federal, State, and tribal environmental laws, and encourages environmental enhancement • Funded through the Commodity Credit Corporation (CCC) • Provides technical land eligibility determinations, conservation planning and practice implementation • Reduces soil erosion • protects the Nation's ability to produce food and fiber • reduces sedimentation in streams and lakes • improves water quality, establishes wildlife habitat • enhances forest and wetland resources • encourages farmers to convert highly erodible to vegetative cover • Farmers receive an annual rental payment for the term of the multi-year contract
-Federal Agricultural Improvement and Reform Act (“freedom to farm act”) • revises and simplifies direct payment programs for crops and eliminates milk price supports through direct government purchases • removed the link between income support payments and farm prices. • It authorized 7-year production flexibility contract payments that provided participating producers with fixed government payments independent of current farm prices and production • specified the total amount of money to be made available through contract payments under production flexibility contracts • The law increased planting flexibility by allowing participants to plant 100% of their total contract acreage to any crop, except with limitations on fruits and vegetables
The Environmental Quality Incentives Program (EQIP) • reauthorized in the Farm Security and Rural Investment Act of 2002 (Farm Bill) • provides a voluntary conservation program for farmers and ranchers that promotes agricultural production and environmental quality as compatible national goals • EQIP offers financial and technical help to assist eligible participants install or implement structural and management practices on eligible agricultural land
Natural Resources Conservation Foundation (NNRCF) • a nonprofit private organization established by the 1996 farm bill • promotes and funds innovative solutions to conservation problems through effective partnerships • The Foundation can accept gifts and raise money • The NNRCF will conduct research, undertake educational activities, support demonstration projects, and make grants to state and local governments and nonprofit organizations • Similar foundations have been created for several other natural resource areas.
Soil Degradation • Soil degradation occurs where our activities (either directly or indirectly) cause it to become less vigorous or less healthy. • The ultimate degradation is the removal or loss of its physical components.
Soil Erosion • Degradation is not the same as soil erosion, which is when the soil is washed or blown away by water or wind. • Soil erosion is common when trees are cut down, and then it rains, so the soil is moved somewhere else (sometimes to the sea/ocean/river). • Trees and their root systems keep the soil in place and thus prevent soil erosion.
Sheet Erosion • Sheet erosion commonly occurs on recently plowed fields or on other sites having poorly consolidated soil material with scant vegetative cover.
Rill Erosion • The formation of numerous, closely spaced rills due to the uneven removal of surface soil by streamlets of running water. Also known as rilling; rill wash; rillwork.
Gully Erosion • Gully erosion is the removal of soil along drainage lines by surface water runoff. • Once started, gullies will continue to move by headward erosion or by slumping of the side walls unless steps are taken to stabilise the disturbance.
Conventional Tillage • Full width tillage which disturbs all of the soil surface and is performed prior to and/or during planting. • There is less than 15 percent residue cover after planting. • Generally involves ploughing or intensive (numerous) tillage trips. • Weed control is accomplished with crop protection products and/or row cultivation.
Soil Erosion as a Global Problem • Soil erosion remains the world's biggest environmental problem, threatening both developed and developing countries, according to sources at the 12th International Soil Conservation Organization (ISCO) Conference, which opened Monday in Beijing. • Sources at the conference said that 65 percent of the soil on earth display degradation phenomena, such as erosion, desertification and salinization.
Desertification • the extreme deterioration of land in arid and dry sub-humid areas due to loss of vegetation and soil moisture; desertification results chiefly from man-made activities and influenced by climatic variations.
The Dust Bowl (The Dirty 30’s) • Period of severe dust storms • Caused ecological and agricultural damage • Caused by severe drought • Also caused by lack of crop-rotation and fallow fields
International Whaling Comission • - Founded 1946, in Washington D.C. • - Purpose is to govern the conduct of whaling throughout the world • - Responsibilities include: • - providing complete protection for certain species • - designate specific areas as whale sanctuaries • - set limits on the numbers and size of whales which may be taken • - decides open and closed seasons for whaling • - prohibits the capture of suckling calves and females accompanied by suckling calves • http://www.iwcoffice.org/index.htm
Chico Mendes • Rubber Trapper in Brazil’s Amazon Region • In the 1980’s became politically active in protecting the rights of Rubber Trappers against the invasion of cattle ranchers • Fought to stop the burning and logging of the Amazon Rainforest • Caught the attention of Environmentalists around the world, but was murdered in 1988 by ranchers who opposed him http://www.chicomendes.com/
Soil By Cameron Miller, Alex Bruno, Luc Shay and Brendan Weyhe
What is Soil? - Soil is a complex plant-supporting system consisting of disintegrated rock, organic matter, water, gases, nutrients, and microorganisms. Soil is a renewable resource, it renews itself over a long period of time. Soil is the foundation for agriculture, it is vital forestry, and for functioning the earth’s natural systems.
What is Soil? • By Volume, soil consists of about half mineral matter, and up to five percent organic matter, and the remainder consists of pore space taken up by air or water • Organic matter in soil includes both living and dead microorganisms, as well as decaying material derived from plants and animals.