U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Subject Brazil Remove constraint Subject: Brazil Text Availability Citation in PubAg Remove constraint Text Availability: Citation in PubAg
Start Over

Search

41,888  Search Results

« Previous | 1 - 20 of 41,888 |
Number of results to display per page

Search Results

1. Development of anammox process for animal waste treatment: experiences in Brazil

Author:
Kunz, Airton; Vanotti, Matias; Szogi, Ariel; Garcia, Mari Cruz; Schierholt Neto, Guilherme Francisco; Soares, Hugo Moreira
Source:
International Symposium on Air Quality and Waste Management for Agriculture : proceedings of the 16-19 September 2007 conference, Broomfield, Colorado pp. -
Subject:
wastewater treatment; animal manure management; anaerobic conditions; ammonia; oxidation; immobilized cells; bacteria; nitrogen; nitrification; denitrification; swine; waste lagoons; sediments; biomass; duration; resins; bioreactors; pig manure; Brazil
Abstract:
... The isolation of anaerobic ammonium oxidation (anammox) bacteria adapted to animal wastewater environments can be of significant importance to farming systems, because excess ammonia in modern, industrial-type livestock production is a global problem, and the use of conventional biological nitrogen (n) removal methods is usually hindered by cost; thus, we think that the more economical anammox bas ...
Handle:
10113/45572

2. Evaluation and integration of a color infrared digital camera system into forest health protection programs in the western United States, Southern Brazil, and Anhui Province, China

Author:
Knapp, K. Andrew; Disperati, Attilio; Sheng, Zhou Jian
Source:
Natural resource management using remote sensing and GIS : proceedings of the Seventh Forest Service Remote Sensing Applications Conference, Nassau Bay, Texas, April 6-10, 1998 / Jerry Dean Greer, editor pp. -
Subject:
remote sensing; digital images; image analysis; aerial photography; insect pests; plant parasitic nematodes; forest pests; forest health; coniferous forests; forest plantations; Pinus; forest trees; Brazil; China; Idaho
Handle:
10113/39957

3. Jaguars, livestock, and people in Brazil: realities and perceptions behind the conflict

Author:
Cavalcanti, Sandra M.C.; Marchini, Silvio; Zimmermann, Alexandra; Gese, Eric M.; Macdonald, David W.
Source:
Biology and conservation of wild felids / edited by David Macdonald and Andrew Loveridge pp. -
Subject:
Panthera onca; livestock; humans; predators; predation; human-wildlife relations; wildlife-livestock relations; perceptions (cognitive); wildlife food habits; Brazil
Handle:
10113/44022

4. Some Brazilian problems in agronomy

Author:
Hunnicutt, B.H.
Source:
Agronomy journal 1913 v.5 no.1 pp. 34-38
ISSN:
0002-1962
Subject:
grain crops; agronomy; climatic factors; edaphic factors; agricultural education; agricultural outlook and situation; Brazil
DOI:
10.2134/agronj1913.00021962000500010004x

5. Brazilian agriculture

Author:
Carlson, F.A.
Source:
Agronomy journal 1925 v.17 no.11 pp. 725-730
ISSN:
0002-1962
Subject:
agriculture; crop production; geographical distribution; animal production; Brazil
DOI:
10.2134/agronj1925.00021962001700110010x

6. Analyses of Several Brazilian Soils in Relation to Plant Responses to Sulfur

Author:
A. C. McClung; L. M. M. de Freitas; W. L. Lott
Source:
Soil Science Society of America journal 1959 v.23 no.3 pp. 221-224
ISSN:
0361-5995
Subject:
B horizons; ammonium acetate; calcium sulfate; dry matter accumulation; greenhouse experimentation; highlands; intensive cropping; millets; plant response; pot culture; savannas; sulfur; virgin forests; virgin soils; Brazil
Abstract:
... Greenhouse studies indicated many soils of the central plateau of Brazil to have a poor S supply. The most acute deficiency was found on soil from an upland savanna, but surface soils (0 to 20 cm. A₀ excluded) from virgin forests also responded. The B horizon of cultivated soils responded less frequently than that of the virgin soils, suggesting some downward movement of S under cropping. Such mov ...
DOI:
10.2136/sssaj1959.03615995002300030020x

7. Modification of Fitness in Species and Strains of Flour Beetles due to X‐Ray and DDT

Author:
Howard E. Erdman
Source:
Ecology 1966 v.47 no.6 pp. 1066-1072
ISSN:
0012-9658
Subject:
DDT (pesticide); Tribolium confusum; X-radiation; adults; biomass; copper; females; filtration; insecticides; ionization; males; mor; mortality; sterilizing; Brazil
Abstract:
... Insecticides and ionizing radiations can induce population changes which under selection are beneficial or harmful. Such changes are known in some cases to have a genetic basis. Studies were designed to determine the early effects of DDT and x—radiation, singly and in combination, on mortality and productivity of flour beetle species and strains (Tribolium confusum Duval "Chicago standard" and T. ...
DOI:
10.2307/1935659

8. Reaction of Peanuts to Dry and Wet Growing Periods in Brazil

Author:
W. H. Wessling
Source:
Agronomy journal 1966 v.58 no.1 pp. 23-26
ISSN:
0002-1962
Subject:
agronomy; dry season; peanuts; rain; temperature; wet season; Brazil; Virginia
Abstract:
... Reactions of Spanish-Valencia, Virginia bunch, and runner peanut varieties and strains to wet and dry growing periods were studied during three growing seasons, 1959 to 1962, in the western part of the State of Sao Paulo, Brazil. During the three wet seasons Spanish—Valencia peanuts made better use of excess moisture at high temperatures than did the other two groups. Virginia bunch and runner var ...
DOI:
10.2134/agronj1966.00021962005800010008x

9. An Empirical Study of the Agricultural Labor Market in a Developing Country, Brazil

Author:
Russell Youmans; G. Edward Schuh
Source:
American journal of agricultural economics 1968 v.50 no.4 pp. 943-961
ISSN:
0002-9092
Subject:
agricultural industry; developing countries; empirical research; farm labor; farms; labor market; production functions; wage rates; Brazil
Abstract:
... Underemployed agricultural labor implies a poorly functioning labor market. The allocative efficiency of the labor market in the Brazilian state of Minas Gerais is evaluated by estimating agricultural production functions for five regions within the state, estimating the MVP of labor, and comparing this with the MVP of labor in other regions and other sectors of the economy, and with wage rates in ...
DOI:
10.2307/1237631

10. Ecological Relations of Three Atta Species in Panama

Author:
Neal A. Weber
Source:
Ecology 1969 v.50 no.1 pp. 141-147
ISSN:
0012-9658
Subject:
Atta; Myrmicocrypta; Sericomyrmex; buildings; clay; climate change; colon; ecotones; foraging; forests; grasslands; habitats; islands; leaf-cutting ants; nesting; nests; sandy soils; Argentina; Arizona; Brazil; Guyana; Louisiana; Panama; Texas; Uruguay; Venezuela
Abstract:
... Of the three Atta species of Panama (sexdens L., cephalotes isthmicola Weber and colonzbica tonsipes Santschi), sexdens is a grassland species as it is in South America, and the other two are forest or forest‐grassland ecotone species. While sexdens and tonsipes may nest in the same general grassy area, sexdens extends along the sandy Pacific shore, and the other two nest primarily in clay. A uniq ...
DOI:
10.2307/1934676

11. Effect of Plant Age and Nitrogen Fertilization on the Chemical Composition and In Vitro Cellulose Digestibility of Tropical Grasses

Author:
J. A. Gomide; C. H. Noller; G. O. Mott; J. H. Conrad; D. L. Hill
Source:
Agronomy journal 1969 v.61 no.1 pp. 116-120
ISSN:
0002-1962
Subject:
Cenchrus clandestinus; Cenchrus purpureus; Cynodon dactylon; Digitaria; Megathyrsus maximus; Melinis minutiflora; agronomy; cellulose; crude fiber; crude protein; dry season; nitrogen; nitrogen fertilizers; pH; plant age; rain; sandy loam soils; summer; tropical grasses; wet season; Brazil
Abstract:
... This study was conducted in the state of Minas Gerals, Brazil, on a sandy loam soil low in fertility and a pH of 5.1. The mean monthly rainfall ranged from near zero during the 5- to 6-month winter dry season and up to 330 mm in the mid-summer wet season. The percentages of dry matter, crude protein, cellulose, crude fiber, and in vitro digestibility were determined on six tropical grass species: ...
DOI:
10.2134/agronj1969.00021962006100010039x

12. Mineral Composition of Six Tropical Grasses as Influenced by Plant Age and Nitrogen Fertilization1 2

Author:
J. A. Gomide; C. H. Noller; G. O. Mott; J. H. Conrad; D. L. Hill
Source:
Agronomy journal 1969 v.61 no.1 pp. 120-123
ISSN:
0002-1962
Subject:
Cenchrus clandestinus; Cenchrus purpureus; Cynodon dactylon; Digitaria eriantha; Megathyrsus maximus; agronomy; cattle; mineral content; nitrogen; nitrogen fertilizers; plant age; sandy loam soils; zinc; Brazil
Abstract:
... This study was conducted in central Brazil on a sandy loam soil which under normal conditions receives no fertilizer. The K, P, Ca, Mg, Cu, Mn, Fe, and Zn contents were determined on six grasses: Meilinis minutiflora Beauv., Digitaria decumbens Stent., Pennisetum purpureum Schum., Pennistetum clandestinumHochst., Cynodon dactylon Pers., and Panicum maximum Jacq. var. ‘Gondlyodes Doell’ Significant ...
DOI:
10.2134/agronj1969.00021962006100010040x

13. Patterns of evolutionary and geographical distribution in neotropical orchids

Author:
BRIEGER, F.G.
Source:
Biological journal of the Linnean Society 1969 v.1 no.1-2 pp. 197-217
ISSN:
0024-4066
Subject:
Cattleya; Oncidium; analysis of variance; biogeography; evolution; flowers; genetic variation; geographical distribution; phenotypic variation; taxonomy; temperate zones; tropics; Brazil; Peru; Venezuela
Abstract:
... Tropical material offers special advantages for the study of evolution, since the evolutionary process has progressed in a more continuous form than in the north temperate region, not having been seriously interrupted by glaciations, nor being restricted in space. The members of the orchid family offer special advantages (a) since the family is one of the largest and probably a most recent one phy ...
DOI:
10.1111/j.1095-8312.1969.tb01819.x

14. Why Don't Boblinks Breed in Brazil?

Author:
William M. Hamner; John Stocking
Source:
Ecology 1970 v.51 no.4 pp. 743-751
ISSN:
0012-9658
Subject:
beak; birds; body weight; color; gametogenesis; latitude; lighting; males; molting; photoperiod; summer; testes; Brazil
Abstract:
... The Bobolink, Dolichonyx oryzivorus, experiences two sets of "long" and "short" days each year during the transequatorial migration between North and South America. Increasing daylength normally stimulates gametogenesis in birds, and thus it is perplexing that Bobolinks do not also respond to the southern summer and attempt to breed in Brazil. Previous hypotheses regarding transequatorial migratio ...
DOI:
10.2307/1934060

15. Identification and quantitation of several nonvolatile organic acids of cocoa beans

Author:
Weissberger, W.; Kavanagh, T.E.; Keeney, P.G.
Source:
Journal of food science 1971 v.36 no.6 pp. 877-879
ISSN:
0022-1147
Subject:
gluconic acid; malic acid; mass spectrometry; lactic acid; capillary gas chromatography; tartaric acid; Theobroma cacao; cocoa beans; extraction; citric acid; succinic acid; quantitative analysis; phosphoric acid; provenance; oxalic acid; chemical composition; seed extracts; geographical variation; ethers; water; trimethylamine; Mexico; Dominican Republic; New Guinea; Ghana; Ecuador; Trinidad and Tobago; Brazil; Samoa

16. Electrochemical Properties of Some Oxisols and Alfisols of the Tropics

Author:
Bernardo Van Raij; Michael Peech
Source:
Soil Science Society of America journal 1972 v.36 no.4 pp. 587-593
ISSN:
0361-5995
Subject:
A horizons; Alfisols; Oxisols; calcium chloride; electrical charges; electrochemistry; ionic strength; ions; magnesium sulfate; models; oxides; protons; titration; tropics; Brazil
Abstract:
... A study of the distribution of the electric charges in the Ap and B2 horizons of two highly weathered Oxisols and one Alfisol from Brazil was made by means of potentiometric titration and by direct measurement of adsorption of ions in the presence of varying concentration of electrolyte. The titration curves at different ionic strengths crossed at the common point of intersection, the zero point o ...
DOI:
10.2136/sssaj1972.03615995003600040027x

17. Implication of Bacillus subtilis in the synthesis of tetramethylpyrazine during fermentation of cocoa beans

Author:
Zak, D.L.; Ostovar, K.; Keeney, P.G.
Source:
Journal of food science 1972 v.37 no.6 pp. 967-968
ISSN:
0022-1147
Subject:
chocolate; flavor; cocoa beans; fermentation; starter cultures; Bacillus subtilis subsp. subtilis; biosynthesis; pyrazines; flavor compounds; quantitative analysis; Brazil; Trinidad and Tobago

18. Implication of Bacillus subtilis in the synthesis of tetramethylpyrazine during fermentation of cocoa beans

Author:
Zak, D.L.; Ostovar, K.; Keeney, P.Q.
Source:
Journal of food science 1972 v.37 no.6 pp. 967-968
ISSN:
0022-1147
Subject:
cocoa beans; fermentation; starter cultures; Bacillus subtilis subsp. subtilis; biosynthesis; pyrazines; flavor compounds; odor compounds; sensory properties; Brazil; Trinidad and Tobago
DOI:
10.1111/j.1365-2621.1972.tb03717.x

19. Social Rates of Return and Other Aspects of Agricultural Research: The Case of Cotton Research in São Paulo, Brazil

Author:
Harry W. Ayer; G. Edward Schuh
Source:
American journal of agricultural economics 1972 v.54 no.4_Part_1 pp. 557-569
ISSN:
0002-9092
Subject:
Gossypium; agricultural economics; agricultural research; cotton; cottonseed; economic impact; employment; exports; issues and policy; landowners; prices; research and development; wage rates; Brazil
Abstract:
... Economic impacts of investments in cotton seed research and development in São Paulo, Brazil, are estimated. The internal rate of return to Brazilian society is estimated to have been approximately 90 percent. The effect on export earnings was large, and consumers benefited via a decrease in the price and an increase in the quantity of cotton cloth. Of total net benefits producers captured about 6 ...
DOI:
10.2307/1238532

20. Agriculture's Place in the Environment: Considerations for Decision Making

Author:
Willard H. Garman
Source:
Journal of environmental quality 1973 v.2 no.3 pp. 327-333
ISSN:
0047-2425
Subject:
air; algae; aquatic plants; bacteria; carbon dioxide; coal; decision making; effluents; energy; eutrophication; farms; fertilizers; industrial wastes; nitrates; nutrients; oils; organic matter; oxygen; photosynthesis; runoff; sewage; shorelines; soil; surface water; symbiosis; wildlife; Africa; Brazil; Canada; Siberia; United States
Abstract:
... Chemical elements at or near the earth's surface and in the air are in a continuing state of movement or subject to forces which can cause movement. The outstanding characteristic is that outgo of inorganic elements (including plant nutrients) from land to water greatly exceeds input over most land surfaces of the earth. Nutrients have been accumulating under water along the shorelines of the worl ...
DOI:
10.2134/jeq1973.00472425000200030002x