Physical Sciences and Mathematics Commons^™

Prediction Of Seed Yield Of Festuca X Lolium Hybrids From The Nursery Mother Plants, C Mousset, L Hazard, M Ghesquiere

IGC Proceedings (1997-2023)

In order to develop commercial Festuca x Lolium hybrids, their seed production has to be improved. Seed yields of Festuca x Lolium progenies were assessed in dense plots. Prediction of those seed yields was based on the morphological observations done on spaced plants in the nursery of both mother plants and their progenies. The best prediction of the progeny seed yields is a linear regression on the stem density and the seed weight per inflorescence assessed on the mother plants.

Soil Enzyme Activities As Bio Indicators Of Soil Ph And Fertility In Temperate Grassland, Iker Mijangos, A. Ibarra, Isabel Albizu, Sorkunde Mendarte, Carlos Garbisu

IGC Proceedings (1997-2023)

In recent years, biological indicators are being used to estimate the continued capacity of a given soil to function (i.e., soil health). After all, biological processes are intimately linked with the maintenance of soil structure and fertility, being more sensitive to changes in the soil than conventional physicochemical parameters. Soil enzymes, as mediators and catalysts of vital soil functions, offer great potential as integrative indicators of soil health (Dick et al., 1996). The main aim of the current work was to study the potential of soil enzyme activities as biological (more precisely, biochemical) indicators of soil physicochemical …

Variation Of Ldmc And Sla Relationship Between Growth Forms In Natural Grasslands, J. Viégas, P. Cruz, J. P. Theau, C. Jouany, P. Ansquer, R. Al Haj Khaled, O. Therond, M. Duru

IGC Proceedings (1997-2023)

In agro-ecological studies, there is a growing interest in measuring both leaf dry matter content (LDMC) and specific leaf area (SLA). This interest lies on the fact that leaf traits are linked to gradients of environmental factors and ecosystem functions. Working with three contrasting wild species, Garnier et al. (2001) proposed a model linking these two traits. The model shows a relatively simple non linear and negative correlation between LDMC and SLA. Nevertheless, none of the species used to build the model were grasses (GRA) or forb rosettes (ROS = i.e. dicotyledonous with large entire leaves and absence of …

Genetic Alternatives For Dairy Producers Who Practise Grazing, H. D. Norman, J. R. Wright, R. L. Powell

IGC Proceedings (1997-2023)

The decline in cow fertility has had a negative impact on all dairy producers, especially those that practise seasonal calving with pasture-based dairying. One alternative that is being tried in the United States (US) by a few graziers is to use bulls from New Zealand (NZ) because NZ producers have practised seasonal calving for some time. However, genotype-environment interaction is a concern; genetic correlations that were derived by the International Bull Evaluation Service (2004) between bull rankings from different countries were often lower for NZ than for other countries. The objective of this study was to compare the performance of …

Implications Of The Links Between Demography And Ecology For The Economy Of The Republic Of Karakalpakstan, Keunimjay Allanazarov, Gulya Khodjaeva, Katherine Shields

Karakalpak Scientific Journal

This article analyzes the impact of demographic factor on territorial organization of production in rural areas of the Republic of Karakalpakstan and reveals the main trends in production development. The analysis of statistical data of rural areas is given and proposals to improve the negative situation are given. More than 1306.8 thousand people live in rural areas of the Republic of Karakalpakstan, where they are concentrated in 1187 settlements, 26 urban settlements, and 11 towns of district subordination. All this testifies to the presence of large undeveloped production reserves and huge human potential. However, due to reduction of Amudarya water …

Long-Term Changes In Soil Surface Properties As Affected By Management Practices In A Wheat-Soybean, Double-Crop System, Machaela Morrison

Crop, Soil and Environmental Sciences Undergraduate Honors Theses

Long-term agricultural sustainability and productivity are controlled by the integrative effects of different management practices on the soil. Many Arkansas producers use the double-crop system to grow soybeans [Glycine max (L.) Merr] and wheat (Triticum aestivum L.). Studying combinations of different, non-traditional, alternative agricultural techniques may help producers better understand the long-term implications of various management practice options on sustainability and productivity. The objective of this study was to evaluate the effects of agricultural management practices, including residue level, tillage, irrigation, and burning, and soil depth on the change in various soil properties from 2010 to 2020 in …

Identification Of Chromosome And Fertility Of Bc1 Of Pentaploid Hybrid Between Elymus Canadensis And Elymus Dahuricus, Zhuo Yu, Yanhong Ma, Xiaolei Li, Zaozhe Li

IGC Proceedings (1997-2023)

No abstract provided.

Studies On Morphology, Cytogenetics And Fertility Of Bc1f1 Of Hybrid F1 Between Elymus Dahuricus And Hordeum Brevisubulatum, Zaozhe Li, Jinfeng Yun, Zhuo Yu

IGC Proceedings (1997-2023)

No abstract provided.

Laboratory Evaluation Of The Effectiveness Of The Fertility Control Bait Contrapest® On Wild-Captured Black Rats (Rattus Rattus), Shane Siers, Robert T. Sugihara, Israel Leinbach, Brandy R. Pyzyna, Gary Witmer

Proceedings of the Twenty-Ninth Vertebrate Pest Conference (2020)

A non-toxic liquid fertility control bait for rats has recently become commercially available (ContraPest® from SenesTech, Inc.). This product contains two chemicals, both of which impair spermatogenesis in male and reduce ovulations in female rats. We tested the efficacy of this bait in wild-caught adult black rats from the island of Hawai’i in a short-term laboratory trial. A control group (n = 25) was offered placebo bait and the treatment group (n = 25) was offered fertility control bait, both ad libitum, during a 15-day introduction period and during the first of four breeding rounds, for a total of 58 …

Comparing Strip Trials Of Chicken Litter, Compost, Hog Manure, And Wet Cattle Manure On Soil Fertility, Tanner Douma, Emily Hummel, Wendi Jo Vande Voort

Student Work

Utilizing agriculture animal and biodegradable waste can reduce the input costs of fertilizers while enhancing the soil. This comparative study focuses on the nutrient values soil receives from agricultural waste. The central objective was, “Due to the historical over-application of manure leading to environmental concerns, a comparative study of soil fertility and economic viability of manures and compost are analyzed in a one-year study”. On an 18.7 acre corn plot, 11 strips were applied with four different manure types, which were randomized, during the 2017 growing season. Chicken litter, compost, hog manure, wet cattle manure, and control strips were replicated …

Post-Testicular Sperm Environment And Fertility, Jean-Luc Gatti, Sandrine Castella, Francoise Dacheux, Heath Ecroyd, S Metayer, Veronique Thimon, Jean-Louis Dacheux

Heath Ecroyd

When mammalian spermatozoa exit the testis, they show a highly specialized morphology; however, they are not yet able to carry out their task: to fertilize an oocyte. This property, that includes the acquisition of motility and the ability to recognize and to fuse with the oocyte investments, is gained only after a transit through the epididymis during which the spermatozoa from the testis travel to the vas deferens. The exact molecular mechanisms that turn these cells into fertile gametes still remain mysterious, but surface-modifying events occurring in response to the external media are key steps in this process. Our laboratory …

Classification And Fertility Of Soils In The Big South Fork National River And Recreation Area Based On Landscape Position And Geology, Ryan H. Blair

Masters Theses

The Big South Fork National River and Recreation Area encompasses more than 50,585 hectares (125,000 acres) of the Cumberland Plateau along the border of Tennessee and Kentucky. Highly dissected and steep terrain have made accessibility to much of the park limited, thus little work has been done to investigate the formation of these soils. Seven native soil profiles were selected for chemical and physical analysis representing Pennsylvanian-aged acidic sandstone and shale geology and landforms. The objectives of this study included the characterization of selected native profiles by physical and chemical analysis, as well as classification using US Soil Taxonomy, to …

Crop Updates 2000 Cereals - Part 4, C. Tang, Z. Rengel, E. Diatloff, B. Mcgann, Mehmet Cakir, Nick Galwey, David Poulsen, M. Carter, A. Briney, R. Wilson, R. H. Potter, M. G. K. Jones, Ian Barclay, Robyn Mclean, Dean Diepeveen, Robert Loughman, Ross Kingwell, Michael O'Connell, Simone Blennerhasset, Benjamin Michael Tiller, Senthold Asseng, Holger Meinke, Bill Bowden, Jeff Russell, Ivan Lee, Clare Johnson, Chris Newman, Robert Emery, Romolo Tassone, Ernestos Kostas, Graeme Ralph, Robert Sudmeyer, David Hall, Harvey Jones

Crop Updates

This session covers twelve papers from different authors:

BREEDING

1.Response to subsoil acidity of wheat genotypes differing in Al-tolerance, C. Tang, Z. Rengel, E. Diatloff and B. McGann, Soil Science and Plant Nutrition/CLIMA, University of Western Australia

2. Application of molecular markers in Barley Improvement, Mehmet Cakir¹, Nick Galwey¹ and David Poulsen^{2, 1}Plant Sciences, Faculty of Agriculture, University of Western Australia, ²Queensland Department of Primary Industries, Hermitage Research Station, Queensland

3. Implementation of molecular markers for wheat improvement in the Western Region, M. Carter¹, A. Briney¹, …