Life Sciences Commons^™

Carbon Dioxide Exchange Rate Of Tall Fescue-Leaf Area Vs. Leaf Weight Basis, Wallace Wilhelm, C. J. Nelson

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

The basis used for expression of carbon dioxide exchange rate (CER) of single leaves may alter the relative ranking of genotypes being selected for a breeding program. Therefore, field and growth chamber experiments were conducted on 16 genotypes of tall fescue (Festuca arundinacea Schreb.) to determine the relative merit of expressing CER data on a leaf area or leaf weight basis. Genotypes were grown in plots in the field and in pots in the growth chamber. The CER was measured using an infrared gas analyzer. Herbage yield was determined. Significant genotypic variation within experiments was found for CER when …

Tillage And Low-Pressure Center-Pivot Irrigation Effects On Corn Yield, Wallace Wilhelm, L.N. Mielke, J. R. Gilley

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Low-pressure sprinkler irrigation systems have the potential to save energy, but also may aggravate soil- and water-management problems. The objective of this research was to determine the influence of center-pivot sprinkler irrigation method in combination with various tillage practices on corn (Zea mays L.) yield and yield components. A center-pivot irrigation machine was designed to apply water by high-pressure-impact (HPI), low-pressure-impact (LPI), and low-pressure-spray (LPS) nozzles. Nozzles were sized and spaced to apply three different amounts of water: 100% (full irrigation), 75 and 50%. Three tillage treatments were used-till-plant (T), disk (D), and till-plant with chisel after last cultivation …

Intsormil 1985 Annual Report: Fighting Hunger With Research, John M. Yohe

INTSORMIL Impacts and Bulletins

This annual report covers the activities for program Year 6, the final year of operation under the initial grant document.

The CRSP's present a unique model for conducting agricultural research in collaboration with developing country agricultural research programs.

The INTSORMIL program also demonstrates these characteristics:

-- INTSORMIL has the dual goal of improving agriculture in the developing countries and in the United States.

- The seven participating U.S. institutions agree to contribute at least 25% of the cost of the CRSP from non-federal resources (in money or in kind), justified on the basis of benefits that can accrue to their …

Cryogenic Preservation Of Semen From The Greater Sandhill Crane, George F. Gee, Murray R. Bakst, Thomas J. Sexton

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Frozen gene pools (semen or embryos) can provide a safe place for the storage of genetic material for many generations. Cranes (Grus spp.) are one of many species in need of gene pool protection. Of the seven species and four subspecies considered rare or endangered (Archibald et al. 1981), two, the whooping crane (G. americana) and the Mississippi sandhill crane (G. canadensis pulla), are part of captive propagation projects at the Patuxent Wildlife Research Center in Laurel, Maryland. Greater sandhill crane (G. c. tabida) semen cryopreservation, under study at Patuxent since 1976 (Sexton …

Twenty-Four-Hour Profiles Of Prolactin And Testosterone In Ram Lambs Exposed To Skeleton Photoperiods Consisting Of Various Light Pulses, B. D. Schanbacher, W. Wu, J. A. Nienaber, G. L. Hahn

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Individual groups of 6 ram lambs were housed within a controlled environment and exposed to one of 6 photoperiod schedules. Groups I and II received 8 (short day) or 16 (long day) h of continuous light, respectively; Groups III, IV and V were exposed to asymmetrical skeleton photoperiods consisting of a main light period of 7 h followed 9 h later by a light pulse of 1 h, 15 min or 1 min duration, respectively, and Group VI was exposed to a symmetrical skeleton photoperiod consisting of two 1-h light pulses positioned 16 h apart. After 4 weeks of treatment …