Productivity and Efficiency

According to the U.S. Environmental Protection Agency, water efficiency is the smart use of our water resources through water-saving technologies and simple steps. Using water efficiently will help ensure reliable water supplies today and for future generations. Topics addressed in this theme provide insights, lessons, and guidance on how diverse stakeholders are working to improve water management and reduce water use.

Productivity and Efficiency Resources

Fish Population Dynamics in Tropical Waters: a Manual for Use With Programmable Calculators

Published: 
January 1, 1973
U.S. Agency for International Development
The use of sprinklers to apply irrigation water is a popular irrigation practice. Interest in using sprinkler irrigation systems continue to grow as the efficient use of water becomes important for profitable crop production. An efficient irrigation system must be capable of applying the water...Read more

Hydraulics of Trickle Irrigation Emitterlines

Published: 
January 1, 1973
U.S. Agency for International Development
A study was conducted to investigate the flushing flow characteristics of flushing emitters, the hydraulics of emitter lines under steady flow conditions, and the uniformity of distribution of emitters as influenced by emitter variations and other environmental factors. The study was composed of...Read more

Biotic Interactions Between Different Species of Algae

Published: 
January 1, 1973
U.S. Agency for International Development
Species of green algae seldom grew as well in two-species cultures with other green algae, or with blue-green algae, as when cultured alone. Several species of algae apparently excreted one or more substances into the medium which inhibited the growth of the second species. Inhibition of growth of...Read more

Essentiality of Vitamin C in Feeds for Intensively Fed Caged Channel Catfish

Published: 
January 1, 1973
U.S. Agency for International Development
Sixteen hundred channel catfish fingerlings were stocked in 1-mE3 floating cages, 400 per cage, and fed production-type diets intensively for 180 days. Half of the fish were fed a diet that was nutritionally sufficient except for being low in vitamin C and the remaining fish were fed the same...Read more

Summer Algal Communities and Primary Productivity in Fish Ponds

Published: 
January 1, 1973
U.S. Agency for International Development
The paper presents data on primary productivity and phytoplankton communities in new experimental ponds which received the following treatments; ammonium nitrate and triplesuperphosphate, triplesuperphosphate, cracked corn (10% crude protein) and Auburn No. 3 fish feed (36% crude protein)...Read more

Irrigation Requirements and Ground Water Development

Published: 
December 1, 1972
U.S. Agency for International Development
The paper presents a moisture availability index that is suggested for use in evaluating water balance conditions. It further presents a method for estimating irrigation requirements that has been evaluated using Brazilian climatic data. Comprehensive tables are provided including a detailed...Read more
Regional focus: 
BrazilLatin America and the Caribbean

Fish Culture Extension Project: Brazil, June-Nov. 1972

Published: 
November 1, 1972
U.S. Agency for International Development
The objective of the fish culture extension project is to assist DNOCS extension agents (specifically those of the Covenio USDENE/DNOCS/USAID -DPAN) in the planning and installation of pilot fish culture enterprises on private farms in Northeast Brazil for the purpose of increasing animal protein...Read more
Regional focus: 
BrazilLatin America and the Caribbean

Land and Water Use Potentials: Tungabhadra Irrigation Project, Mysore, India

Published: 
October 1, 1972
U.S. Agency for International Development
The study investigated land and water use potentials of the Tungabhadra Irrigation Project (TBP) located in one of the most sparsely settled and impoverished areas of Mysore State, India. Its objectives were to determine the most profitable crops that could be grown on the black soils in the TBP...Read more
Regional focus: 
IndiaSouth East Asia

Sources of Carbon Dioxide for Nuisance Blooms of Algae

Published: 
September 1, 1972
U.S. Agency for International Development
Bacterial production of CO2 from sucrose substrate increased growth of seven species of algae of CO2-limited laboratory cultures. Decomposition of organic matter in pond water also supplied enough CO2 to support good algal growth in cultures deprived of other sources of CO2. Estimates of CO2...Read more

Annual Report for FY 1972

Published: 
August 3, 1972
U.S. Agency for International Development
This annual report details the work that was done at the International Center for Aquaculture from July 1971 through June 1972. It identifies the accomplishments over the year in topics including inland fisheries, aquacultural developments abroad, fish breeding and genetics, fish feeds, methods for...Read more
Regional focus: 
United StatesNorth America

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