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Potential Economic And Environmental Impacts Of Alternative Sediment Control Policies, Center For Agricultural And Rural Development, Iowa State University, Joseph C. Campbell Dec 1979

Potential Economic And Environmental Impacts Of Alternative Sediment Control Policies, Center For Agricultural And Rural Development, Iowa State University, Joseph C. Campbell

CARD Reports

This study focuses on the interaction of U.S. agricultural exports, regional patterns of farm production, and the problem of agricultural sediment. It also evaluates alternative policies in abating sedimentation of the nation's main river basins. One underlying hypothesis of the study is that changes in agricultural export demands cause shifts in the comparative advantage among producing regions within the United States and alter regional land use patterns, farm incomes, consumer food prices, and soil loss. Given this hypothesis, the study uses a mathematical model and two estimates of the U.S. 1985 agricultural exports to investigate if and ...


Mechanism Of Decarboxylation Of Glycine And Glycolate By Isolated Soybean Cells, David J. Oliver Dec 1979

Mechanism Of Decarboxylation Of Glycine And Glycolate By Isolated Soybean Cells, David J. Oliver

David J. Oliver

Isolated soybean leaf mesophyll cells decarboxylated exogenously added [1-14C]glycolate and [1-14C]glycine in the dark. The rate of CO2 release from glycine was inhibited over 90% by isonicotinic acid hydrazide and about 80% by KCN, two inhibitors of the glycine to serine plus CO2 reaction. The release of CO2 from glycolate was inhibited by less than 50% under the same conditions. This indicates that about 50% of the CO2 released from glycolate occurred at a site other than the glycine to serine reaction. The sensitivity of this alternative site of CO2 release to an inhibitor of glycolate oxidase (methyl-2-hydroxy-3-butynoate ...


The 1979 Iowa Corn Yield Test Report, District 1, Kenneth E. Ziegler, C. D. Hutchcroft Dec 1979

The 1979 Iowa Corn Yield Test Report, District 1, Kenneth E. Ziegler, C. D. Hutchcroft

Iowa Corn Yield Tests

Results of the Iowa Corn Yield Test are published to sixtieth consecutive year for the test.


The 1979 Iowa Corn Yield Test Report, District 2, Kenneth E. Ziegler, C. D. Hutchcroft Dec 1979

The 1979 Iowa Corn Yield Test Report, District 2, Kenneth E. Ziegler, C. D. Hutchcroft

Iowa Corn Yield Tests

Results of the Iowa Corn Yield Test are published to sixtieth consecutive year for the test.


The 1979 Iowa Corn Yield Test Report, District 6, Kenneth E. Ziegler, C. D. Hutchcroft Dec 1979

The 1979 Iowa Corn Yield Test Report, District 6, Kenneth E. Ziegler, C. D. Hutchcroft

Iowa Corn Yield Tests

Results of the Iowa Corn Yield Test are published to sixtieth consecutive year for the test.


The 1979 Iowa Corn Yield Test Report, District 7, Kenneth E. Ziegler, C. D. Hutchcroft Dec 1979

The 1979 Iowa Corn Yield Test Report, District 7, Kenneth E. Ziegler, C. D. Hutchcroft

Iowa Corn Yield Tests

Results of the Iowa Corn Yield Test are published to sixtieth consecutive year for the test.


The 1979 Iowa Corn Yield Test Report, District 3, Kenneth E. Ziegler, C. D. Hutchcroft Dec 1979

The 1979 Iowa Corn Yield Test Report, District 3, Kenneth E. Ziegler, C. D. Hutchcroft

Iowa Corn Yield Tests

Results of the Iowa Corn Yield Test are published to sixtieth consecutive year for the test.


The 1979 Iowa Corn Yield Test Report, District 5, Kenneth E. Ziegler, C. D. Hutchcroft Dec 1979

The 1979 Iowa Corn Yield Test Report, District 5, Kenneth E. Ziegler, C. D. Hutchcroft

Iowa Corn Yield Tests

Results of the Iowa Corn Yield Test are published to sixtieth consecutive year for the test.


The 1979 Iowa Corn Yield Test Report, District 4, Kenneth E. Ziegler, C. D. Hutchcroft Dec 1979

The 1979 Iowa Corn Yield Test Report, District 4, Kenneth E. Ziegler, C. D. Hutchcroft

Iowa Corn Yield Tests

Results of the Iowa Corn Yield Test are published to sixtieth consecutive year for the test.


Iowa Agriculturist 81.01, Sara Wyant Oct 1979

Iowa Agriculturist 81.01, Sara Wyant

Iowa Agriculturist

Udderances 4

For Export Only 6

IPM 9

Without Education 10

To: Ag Researchers 11

Paving the Way 14

Muscles and Men 16

Help Wanted 18

Aiming for the Cure 21

Equipment design 24

Five Different Tunes 26

Students Concerned 29

The final word 32


Applications Of Economics In Plant And Animal Breeding, Bryan E. Melton Oct 1979

Applications Of Economics In Plant And Animal Breeding, Bryan E. Melton

Economic Staff Paper Series

Throughout history man's very existence has been characterized by his continuing struggle to obtain sufficient food, clothing and shelter. With a growing population and declining agricultural resources such as energy, water and land, the greatest challenge to fulfilling these fundamental human needs may be yet to come. One means of meeting growing demands on an agriculture faced with shrinking resource availability is by improving the productivity of the plant and animal species used in agriculture. Breeders attempt to achieve this improvement through the application of the principles of modern quantitative genetics to the breeding of plants and animals for ...


An Analysis Of American Agriculture Under Various Policy Alternatives For 1980, Center For Agricultural And Rural Development, Iowa State University, Ashok Chowdhury, Earl O. Heady Oct 1979

An Analysis Of American Agriculture Under Various Policy Alternatives For 1980, Center For Agricultural And Rural Development, Iowa State University, Ashok Chowdhury, Earl O. Heady

CARD Reports

Historically, the U.S. farm sector has been a leader in meeting the challenges of the world's growing food demand. American farmers produced an impressive 24 percent of the total world food and feed grains in 1977. They also contributed 53.6 percent of total world exports of these farm commodities in the same year. This achievement was possible through a combination of past governmental policies and technological developments. In the beginning cheap land and other inexpensive inputs encouraged farmers to increase agricultural production by expanding the use of these inputs. Gradually, technological innovations and mechanization of agriculture accelerated ...


U.S. Food Exports Under Various Worldwide Nutritional Constraints, Center For Agricultural And Rural Development, Iowa State University, Doeke C. Faber, Earl O. Heady Aug 1979

U.S. Food Exports Under Various Worldwide Nutritional Constraints, Center For Agricultural And Rural Development, Iowa State University, Doeke C. Faber, Earl O. Heady

CARD Reports

The world has become increasingly concerned with problems of health, population control, food production, and economic development. Organizations of the United Nations (Food and Agriculture Organization [FAO], International Labor Organization [ILO], World Health Organization [WHO], United Nations Economic Social and Cultural Organization [UNESCO], United Nations Development Program [UNDP]) have channeled a large amount of talent and finance into these areas in an attempt to improve conditions under which present and future generations live. Similarly, development organizations of individual nations and organizations such as the Rockefeller Foundation, the Ford Foundation, and the international research institutes also are making large contributions to ...


Agriculture And Water Quality Improvement, Lee A. Christensen, John A. Miranowski Jul 1979

Agriculture And Water Quality Improvement, Lee A. Christensen, John A. Miranowski

ISU Economic Report Series

The symposium "Agricultural and Water Quality Improvements; What are the Implementation Costs and Policy Issues?" was organized to establish what is known and to identify additional research needs. The major impetus for action on agricultural nonpoint source pollution problems comes from Section 208 of the Federal Water Pollution Control Amendments of 1972 and the Rural Clean Water Program. Public programs involving large expenditures from both public and private sources are being implemented and require economic research and analysis...


Final Report: Agricultural Sector Analysis In Thailand, Division Of Agricultural Economics, Ministry Of Agriculture And Cooperatives, Royal Thai Government, The Center For Agricultural And Rural Development, Iowa State University Jul 1979

Final Report: Agricultural Sector Analysis In Thailand, Division Of Agricultural Economics, Ministry Of Agriculture And Cooperatives, Royal Thai Government, The Center For Agricultural And Rural Development, Iowa State University

DAE-CARD Sector Analysis Series

The Agricultural Sector Analysis project in Thailand was initiated July 1, 1973,as a cooperative program between the Royal Thai Government and the United States Government. Royal Thai Government participation was provided by the Division of Agricultural Economics of the Ministry of Agricultural and Cooperatives with U.S. participation provided by Iowa State University. Funding for the project was furnished by the United States Agency for International Development and by the Royal Thai Government through the Department of Technical and Economic Cooperation. The project was funded initially for two years. It was subsequently extended to six years ending June 30 ...


Vesicular-Arbuscular Mycorrhiza Influence Growth But Not Mineral Concentrations In Seedlings Of Eight Sweetgum Families, Richard C. Schultz, Paul P. Kormanik, W. Craig Bryan, G. H. Brister Jun 1979

Vesicular-Arbuscular Mycorrhiza Influence Growth But Not Mineral Concentrations In Seedlings Of Eight Sweetgum Families, Richard C. Schultz, Paul P. Kormanik, W. Craig Bryan, G. H. Brister

Richard C. Schultz

Seedlings of eight half-sib sweetgum (Liquidambar styraciflua L.) families were grown for 6 months in a fumigated soil mixture, with or without inoculum from a mixture of Glomus mosseae and Glomus etunicatus fungi, at levels of 140, 280, 560, and 1120 kg/ha of 10-10-10 fertilizer. All seedlings received three additions of 187 kg/ha of N during the growing season. Inoculated seedlings had significantly greater biomass, height, and stem diameters at each fertilizer level than nonmycorrhizal control seedlings. Significant differences in growth occurred between families in mycorrhizal plants. However, fertilizer did not significantly affect growth or nutrient uptake of ...


Volume Of Grain And Fertilizer Requiring Transportation: Projections To 1984-1985 And 1989-1990 By Counties In Iowa, Center For Agricultural And Rural Development, Iowa State University, John J. Miller, C. Phillip Baumel, Robert N. Wisner, Thomas E. Fenton Jun 1979

Volume Of Grain And Fertilizer Requiring Transportation: Projections To 1984-1985 And 1989-1990 By Counties In Iowa, Center For Agricultural And Rural Development, Iowa State University, John J. Miller, C. Phillip Baumel, Robert N. Wisner, Thomas E. Fenton

CARD Reports

Iowa's grain and fertilizer transportation and distribution systems are undergoing major changes. Some rail lines are being upgraded; others are being abandoned. Major grain elevator expansions have been completed at some locations, and other grain and fertilizer facility expansions are being considered. Information on both the volume of grain likely to be moved out of Iowa counties and on the required in shipments of fertilizer in future years is needed to guide decisions on grain and fertilizer transportation and distribution facility expansion, relocation, or abandonment.


Weight Loss Of Fed Steers And Marketing-Decision Implications, Ronald Raikes, Gail M. Sieck, H. L. Self, M. Peter Hoffman Apr 1979

Weight Loss Of Fed Steers And Marketing-Decision Implications, Ronald Raikes, Gail M. Sieck, H. L. Self, M. Peter Hoffman

Special Report

Weight loss of fed steers during shipment to market adds to marketing cost. An understanding of factors influencing weight loss will aid feeders in making marketing decisions. In this study, we identified several factors that have a significant impact on percentage liveweight shrink and on hot-carcass weights of fed steers, quantified these impacts, and developed a method for predicting liveweight shrink and hot-carcass weight. Predictions of liveweight shrink and hot-carcass weight formed the basis for our development of guidelines for the evaluation and comparison of fed-steer marketing alternatives.


Research Notes: The Influence Of Low Temperatures On The Development And Structure Of Yield Formation Of Three Cold Tolerant And A Standard Soybean Variety, E. R. Keller, J. Schmid Apr 1979

Research Notes: The Influence Of Low Temperatures On The Development And Structure Of Yield Formation Of Three Cold Tolerant And A Standard Soybean Variety, E. R. Keller, J. Schmid

Soybean Genetics Newsletter

The amount and stability of the yield of soybeans cultivated under Swiss climatic conditions is still unsatisfactory. Breeding studies (Piattini, 1977; Soldati, 1976) in relation to yield structure under various climatic conditions in Switzerland were conducted. It became evident that poor utilization of the available yield potential of different soybean varieties could be attributed mainly to low temperatures in the course of the vegetation period.


Research Notes: Induced Cytoplasmic Sterility In Soybeans, B. B. Singh, Kamendra Singh, Puspendra Apr 1979

Research Notes: Induced Cytoplasmic Sterility In Soybeans, B. B. Singh, Kamendra Singh, Puspendra

Soybean Genetics Newsletter

One of the M4 progenies of PK-71-39 soybean irradiated with 10 Kr gamma rays showed segregation for sterility in soybean in 1976. It had 18 sterile plants and 4 normal plants, indicating that a single dominant gene was responsible for sterility. The sterile plants had no seeds and, therefore, this appeared to be a dead end for this mutant.


Research Notes: Soybean Germplasm Resistant To Heliothis Zea-Boddie, J. M. Joshi Apr 1979

Research Notes: Soybean Germplasm Resistant To Heliothis Zea-Boddie, J. M. Joshi

Soybean Genetics Newsletter

Corn earwonn (Heliothis zea-Boddie) is a very destructive pest of soybeans (Glycine max [L.] Merrill). It feeds both on foliage as well as developing pods. Each larva is capable of damaging 6 to 8.2 pods or 7. 1 seeds between 4th and 6th (both inclusive) instars (Boldt et al., 1975; Smith and Bass, 1972).


Research Notes: A Breeding Project Aimed At Producing Major Morphological Changes Required To Fit A Soybean "Idiotype", J. R. Tattersfield, J. H. Williams Apr 1979

Research Notes: A Breeding Project Aimed At Producing Major Morphological Changes Required To Fit A Soybean "Idiotype", J. R. Tattersfield, J. H. Williams

Soybean Genetics Newsletter

There is evidence that only small increases in yield have resulted from soybean breeding in the United States during the past 30 years and that some major limitations to yield have been reached (Frey, 1971). During this period the main advances have been in developing resistance to pests and diseases, and improving agronomic traits such as resistance to lodging and shattering. Considerable increases in yield have been achieved during this period in programs conducted for the development of soybeans in the tropics and subtropics. through adaptability to short days and high temperatures.


Research Notes: Evaluation Of Soybean Germplasm For Resistance To Corn Earworm -- Iii, J. M. Joshi Apr 1979

Research Notes: Evaluation Of Soybean Germplasm For Resistance To Corn Earworm -- Iii, J. M. Joshi

Soybean Genetics Newsletter

During previous years (1974-75), soybean cultivars belonging to Maturity Groups 00 to IV were tested in the screenhouse for corn earworm (Heliothis zea-Boddie) resistance and the results were reported in the 1978 issue of Soybean Genetics Newsletter (Joshi, 1978a, 1978b). A new batch of soybean cultivars, 30 belonging to Maturity Group IV and 39 to Maturity Group V, were tested in the screenhouse (54' x 72' x 15') during 1976. Ten seeds of each cultivar were planted on June 16, 1976 in 4 replications, the seeds being 2" apart within the row and rows being 36" apart.


Recent Soybean Genetics And Breeding Publications, Soybean Genetics Newsletter Apr 1979

Recent Soybean Genetics And Breeding Publications, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Pollen Movement To Male Sterile Soybeans In Southern Illinois, Randall L. Nelson, Richard L. Bernard Apr 1979

Research Notes: Pollen Movement To Male Sterile Soybeans In Southern Illinois, Randall L. Nelson, Richard L. Bernard

Soybean Genetics Newsletter

The effective use of genetic male sterility in soybeans requires controlled pollen movement. Soybean pollen is carried by insects with bees usually considered the most likely candidate in Illinois. The following experiment was designed to determine how far soybean pollen can be carried to fertilize male sterile soybeans when pollen is also available from adjacent plants.


Front Matter, Soybean Genetics Newsletter Apr 1979

Front Matter, Soybean Genetics Newsletter

Soybean Genetics Newsletter

No abstract provided.


Research Notes: Selection Of A Maternally Inherited Male-Sterile Trait In Soybeans, J. W. Burton, R. H. Liles Apr 1979

Research Notes: Selection Of A Maternally Inherited Male-Sterile Trait In Soybeans, J. W. Burton, R. H. Liles

Soybean Genetics Newsletter

The induction of male sterility in soybeans with the use of ethidium bromide (EB) was reported in 1977 (Burton, 1977). Further investigations have provided evidence that the sterility of one of the plants recovered from mutagenesis is maternally inherited. In 1976, large samples of 'Ransom', 'Jackson' and 'Lee 74' seeds were treated with EB and planted in the field (the M1 generation).


Research Notes: Morphological Mutat Ions Of Soybeans Induced With Chemical Mutagens And Ganma Rays, V. I. Sichkar Apr 1979

Research Notes: Morphological Mutat Ions Of Soybeans Induced With Chemical Mutagens And Ganma Rays, V. I. Sichkar

Soybean Genetics Newsletter

The method of experimental mutagenesis is effective in investigating the hereditary alterations of plants with their further use in selection. Year by year the research in this field grows wider, covering new research institutions and crops. The purpose of this article was to investigate the efficiency of a number of chemical mutagens and gamma rays in induction of morphological mutations in soybeans with their further use in selection of this crop.


Research Notes: Soybean Linkage Tests, R. I. Buzzell Apr 1979

Research Notes: Soybean Linkage Tests, R. I. Buzzell

Soybean Genetics Newsletter

F2 linkage results are presented in Table l with a= XY, b= Xy, c= xY and d= xy for the eight gene pairs listed in the fonn of Xx and Yy. Percentage recombination was obtained from the ratio products following Irrmer and Henderson (1943). The data for each of the gene pairs gave a good fit to a 3:1 ratio.


Research Notes: Soybean Plant Design For Closed Ecological Life Support System, J. M. Joshi, Brenda L. Spence Apr 1979

Research Notes: Soybean Plant Design For Closed Ecological Life Support System, J. M. Joshi, Brenda L. Spence

Soybean Genetics Newsletter

Prior to the establishment of the space habitats of the future, the life science program office of the National Aeronautics and Space Administration (NASA) is interested in the development of a ground-based manned demonstration of the closed ecological life support system (CELSS). Since CELSS concept centers around complete recycling of all available resources, a genetic plant design to render the total plant more useful is very important. Previous studies (Phillips , 1977; Phillips et al., 1978) conducted for NASA clearly indicate the usefulness of soybean-Plants in such a system.