University of Nebraska-Lincoln
Universidad de La Salle, Yopal, Casanare
Utah State University
University of Kentucky
Machine Learning-Based Soybean Yield Prediction And Optimizing Lidar-Mounted Uav Efficiency,
2024
Louisiana State University
Machine Learning-Based Soybean Yield Prediction And Optimizing Lidar-Mounted Uav Efficiency, Leticia Santos
LSU Master's Theses
The first chapter of this thesis explores the predictive capabilities of random forests algorithm on datasets obtained from field plot experiments on crop management systems in soybean. Furthermore, the chapter presents a complementary analysis of model performance according to dataset sizes and two techniques on how to impute and deal with missing data. Random forests are being compared with standard statistical techniques such as linear regression on a well-structured, information-rich agronomic experiment. The key findings of this chapter includes the best hyperparameters adjustment and the identification of the dataset threshold for optimal algorithms performance. The second chapter has a research …
Summaries Of Arkansas Cotton Research 2022,
2023
University of Arkansas, Fayetteville
Summaries Of Arkansas Cotton Research 2022, Fred Bourland
Arkansas Agricultural Experiment Station Research Series
The current economic environment continues to drive the need to produce record or near-record yields to be profitable. Price volatility in 2022 added another level of difficulty in the quest for being profitable. The cotton market saw significant movement after reaching a $1.5802 per pound high in May 2022, cotton prices corrected and more than halved in value at the October 2022 low, and then consolidated around the 80 cents per pound level in December 2022 (Cotton is Consolidating). Great uncertainties still exist for the upcoming season, most of which are outside of our control. These include, but are not …
Herbicide And Additive Impacts On Bradyrhizobium Japonicum Growth In Solution,
2023
South Dakota State University
Herbicide And Additive Impacts On Bradyrhizobium Japonicum Growth In Solution, Joy Amajioyi, Thandiwe Nleya, Senthil Subramanian, Sharon A. Clay
Agronomy, Horticulture and Plant Science Faculty Publications
Plant biostimulants include beneficial fungi and bacteria, and are often applied to foliage to improve crop growth, yield, and/or crop quality. Crop improvements due to biostimulant addition may be modest; therefore, solo applications may not be economical or climate smart. However, biostimulants combined with other postemergence treatments, such as herbicides, may provide an alternative application method, if mixtures do not harm the living organism(s). The growth of Bradyrhizobium japonicum, as a biostimulant surrogate, was assessed in solutions of glyphosate [N-(phosphonomethyl)glycine] and dicamba (3,6-dichloro-2-methoxybenzoic acid), with and without common spray additives (ammonium sulfate [AMS] and nonionic surfactant) in laboratory studies over …
Dicamba Off-Target Movement From Applications On Soybeans At
Two Growth Stages,
2023
University of Nebraska–Lincoln
Dicamba Off-Target Movement From Applications On Soybeans At Two Growth Stages, Greg R. Kruger, Guilherme S. Alves, Kasey Schroeder, Jeffrey A. Golus, Daniel B. Reynolds, Darrin M. Dodds, Ashli E. Brown, Bradley K. Fritz, Wesley C. Hoffmann
Agronomy & Horticulture -- Faculty Publications
The objective of this study was to evaluate dicamba off-target movement during and after applications over soybean at two growth stages. Dicamba-tolerant soybean [Glycine max (L.) Merr.] at V3 and R1 growth stages in Nebraska and Mississippi fields were treated with diglycolamine salt of dicamba (560 g ae ha−1), potassium salt of glyphosate (1260 g ae ha−1), and a drift-reducing adjuvant (0.5% v v−1). Filter papers positioned outside the sprayed area were used to determine primary movement and air samplers positioned at the center of sprayed area were used to calculate dicamba flux …
Asparagus (Asparagus Officinalis L.) Root Distribution: Cultivar Differences In Mature Plantings,
2023
Utah State University
Asparagus (Asparagus Officinalis L.) Root Distribution: Cultivar Differences In Mature Plantings, Daniel Drost
Plants, Soils, and Climate Faculty Publications
Annual plant growth patterns and seasonal conditions have both been shown to influence asparagus (Asparagus officinalis L.) root development over time. Root biomass and distribution changes in mature asparagus cultivars are herein illustrated and described. Asparagus root length density and biomass were estimated from soil cores using a systematic field sampling approach each spring. Soil cores (0.9 m deep) were divided into 0.15 m lengths and fleshy roots collected from the soil. Root length density and dry weights were determined and root distribution maps generated from collected data. As asparagus plantings matured, the sampling year had a significant influence …
Scaling Up Of Site Carbon Dynamics To Predict The Carbon Dynamics In Kazakhstan, Central Asia,
2023
USGS EROS Data Center
Scaling Up Of Site Carbon Dynamics To Predict The Carbon Dynamics In Kazakhstan, Central Asia, B. K. Wylie, Tagir Gilmanov, S. L. Stensaas, N. Z. Saliendra, D. A. Johnson, K. Akshalov, S. B. Frank, L. Zhang, R. F. Doyle, E. A. Laca, Montague W. Demment
IGC Proceedings (2001-2021)
Climate and management determine whether rangelands are net carbon sources or carbon sinks. Regional carbon dynamics of the Kazakh Steppe has not previously been documented. The objective of this study is to quantify the regional carbon flux dynamics of these extensive steppes.
A New System For Plant Experiments On Biodiversity Or Multi-Species Competition,
2023
University College Dublin, Ireland
A New System For Plant Experiments On Biodiversity Or Multi-Species Competition, John Connolly, L. Kirwan
IGC Proceedings (2001-2021)
Considerable discussion in recent years has focused on the design of competition and biodiversity experiments (Connolly et al., 2001a; Allison, 1999). Few agronomic experiments with >2 plant species have been conducted in greenhouse conditions (Gibson et al, 1999) or in the field (Connolly et al., 2001b). In many experiments the effects of density and initial species size have been confounded. The effects of species richness and evenness also are confounded frequently. The proposed system provides a framework of design and analysis, in which to address questions of function at community level and of structure and competition at …
Native Grasses Seeded Into A Cool-Season Pasture Encouraged By Low Resource Availability,
2023
University of Wisconsin-Madison
Native Grasses Seeded Into A Cool-Season Pasture Encouraged By Low Resource Availability, J. E. Doll, R. L. Cates, R. D. Jackson
IGC Proceedings (2001-2021)
Native prairie of the Upper Midwest, which was dominated by warm-season (C4) grasses, now exists as relatively small relict and restored patches (Curtis 1959). Re-introduction of natives into grazed agroecosystems would promote genetic, species, and landscape diversity. Extensive re-introduction of C4 grasses will require a shift away from the paradigm of maximizing production because C4 grasses have higher C:N ratios than C3 grasses rendering them inferior forage species. Nonetheless, there is great interest amongst the grazing community of the Upper Midwest in establishing native grasses as a means of improving wildlife habitat and increasing belowground …
The Ag-Biota Project: A Preliminary Assessment Of Potential Indicators Of Biodiversity In Agricultural Grasslands,
2023
University College Dublin, Ireland
The Ag-Biota Project: A Preliminary Assessment Of Potential Indicators Of Biodiversity In Agricultural Grasslands, Gordon Purvis, A. Anderson, A. J. Helden, L. Kirwan
IGC Proceedings (2001-2021)
In compliance with European commitments to the Convention on Biological Diversity, the conservation and enhancement of biodiversity within agricultural land is a primary objective of current agri-environmental measures. However, there is a widespread lack of information concerning the effectiveness of agri-environmental schemes in Europe, (Kleijn & Sutherland, 2003). In large part, this is due to uncertainties about selection of appropriate biological indicators of biodiversity (Buchs, 2003; Duelli & Obrist, 2003).
Effects Of Plant Species Diversity In Multifunctional Grasslands On Avian Communities,
2023
Dakota State University
Effects Of Plant Species Diversity In Multifunctional Grasslands On Avian Communities, K. K. Bakker, K. F. Higgins
IGC Proceedings (2001-2021)
Grasslands, planted or native sod, can provide multiple simultaneous functions (e.g., hay-forage production, biomass fuel products, bird nesting cover, soil and water conservation). Bird use of and abundance in grasslands is dependent on vegetation structure, size, and surrounding landscape (Bakker et al., 2002) but little is known about avian relationships to plant species diversity. We evaluated the relationship between plant species diversity and avian community structure in 5 grassland types. The results have application to grazing, haying, burning, and conservation practices applied to native and sown grassland stands and to conservation strategies for declining grassland bird populations.
Diversity And Adaptation Of Perennial Plants From North Africa: Legumes And Grasses,
2023
Ecole Nationale Supérieure Agronomique, Algeria
Diversity And Adaptation Of Perennial Plants From North Africa: Legumes And Grasses, Aissa Abdelguerfi, M. Laouar, K. Abbas, M. M'Hammedi Bouzina
IGC Proceedings (2001-2021)
A variety of climates, soil types and reliefs characterise North Africa (Algeria, Morocco, and Tunisia). These natural conditions have produced a large diversity of environments, landscapes, plant formations and flora. Several factors have contributed to the spread of a wide floristic variety: the influence of the Mediterranean in the north and in the north-east, the Atlantic in the west, and the Sahara in the south, as well as the presence of mountain ranges, particularly the Rif, the Tell Atlas, the Sahara Atlas, the Middle Atlas, the High Atlas, and the Anti-Atlas. This diversity of landscapes, environments and ecosystems has generated …
Comparison Of Compositional Changes In Multi-Species Grass/Legume Mixture Experiments Across Three Nordic Countries (Iceland, Sweden And Finland) Over Two Years,
2023
University College Dublin, Ireland
Comparison Of Compositional Changes In Multi-Species Grass/Legume Mixture Experiments Across Three Nordic Countries (Iceland, Sweden And Finland) Over Two Years, Caroline Brophy, Anne-Maj Gustavsson, A. Helgadottir, Oiva Nissinen, J. Connolly
IGC Proceedings (2001-2021)
A multi-site experiment was established at 39 sites across Europe, Australia and Canada within COST Action 852 to: (1) assess the benefits of grass/legume mixtures over monocultures, (2) test the stability of mixtures and (3) evaluate the consistency of the observed patterns over broad environmental gradients. This paper compares the results from 3 Nordic sites using the same plant species: Korpa Experimental Station in Iceland, Lapland Research Station in Finland and Piteå in Sweden to investigate if compositional changes in mixtures are consistent across the sites.
Site Effects On The Composition Of Multi-Species Grass/Legume Mixtures During Sward Establishment,
2023
IGER, UK
Site Effects On The Composition Of Multi-Species Grass/Legume Mixtures During Sward Establishment, Rosemary P. Collins, M. Fothergill, John Connolly
IGC Proceedings (2001-2021)
Under the auspices of COST Action 852, a multi-site experiment investigated issues of community structure, function and their interrelationships in multi-species grass/legume mixtures (Collins et al., 2004; Sebastià et al., 2004). We describe the effects of 2 contrasting sites on forage yield and species composition during sward establishment.
Unplanned Fires And Sustainability Of A Semi-Arid Rangeland In South Africa,
2023
University of the Free State, South Africa
Unplanned Fires And Sustainability Of A Semi-Arid Rangeland In South Africa, Hennie A. Snyman
IGC Proceedings (2001-2021)
Whether due to lightning or human negligence, large-scale unplanned fires affect large areas of the semi-arid southern African rangelands during the dormant winter (June-August) period (Everson 1999). These fires cause enormous fodder flow problems, and also influence ecosystem functioning (Snyman 2003). The short-term impact (2 years) of an unplanned fire on the sensitivity of above- and belowground productivity of a semi-arid rangeland was therefore investigated.
Effects Of Burning On Grassland Vegetation Cover On The Northeastern Side Of The Alborz Ranges In Iran,
2023
The Islamic Azad University, Iran
Effects Of Burning On Grassland Vegetation Cover On The Northeastern Side Of The Alborz Ranges In Iran, F. Amiri, M. R. Chaichi, A. Atrakchali
IGC Proceedings (2001-2021)
Golestan National Park is located on the northeastern side of the Alborz ranges, Golestan province, Iran. Because of the special vegetation cover and being located close to two wet and dry weather areas, this park is vulnerable to fire hazards. Between 1957 and 2004 more than 67 fires have been reported in the park. The international importance of the park requires a careful study on fire effects on vegetation cover, phytomass production, grass diversity and successional process after fires.
The Influence Of Tree Thinning And Subhabitat Differentiation On Panicum Maximum And Urochloa Mosambicensis Of A Bush Encroached Semi-Arid Savanna In South Africa,
2023
University of the Free State, South Africa
The Influence Of Tree Thinning And Subhabitat Differentiation On Panicum Maximum And Urochloa Mosambicensis Of A Bush Encroached Semi-Arid Savanna In South Africa, G. N. Smit
IGC Proceedings (2001-2021)
The productivity of grasses is most important for herbivores in extensive semi-arid savannas. In these areas an increase in woody plant abundance, commonly referred to as bush encroachment, suppresses grasses. This is the main reason why landowners often consider thinning or even total clearing of all woody plants. The aims of this study were to investigate the influence of different intensities of tree thinning and subhabitat differentiation on the grass layer of a semi-arid South African savanna.
The Effect Of Different Utilisation Methods On Composition Of Semi-Natural Grassland,
2023
Slovak Agricultural University, Slovakia
The Effect Of Different Utilisation Methods On Composition Of Semi-Natural Grassland, J. Jančovič, L'. Vozár, L'. Jančovičová
IGC Proceedings (2001-2021)
There has been much research on application of mineral fertilisers to permanent grasslands to maximise production of above-ground phytomass (Folkman & Jančovič 1990), but the changes arising after exclusion of fertilisers have not been studied in Slovak Republic up to now despite current interest in low input ststems. This paper reports on the effects of cessation of fertiliser inputs for an eight-year period.
Impact Of The Agricultural Use On The Biodiversity Of A Festuca Rubra Meadow,
2023
University of Agricultural Sciences and Medicine, Romania
Impact Of The Agricultural Use On The Biodiversity Of A Festuca Rubra Meadow, I. Rotar, F. Păcirar, R. Vidican, N. Sima
IGC Proceedings (2001-2021)
Technological inputs into meadow ecosystems trigger significant changes in the sward. In this paper we present the effect of organic and mineral fertilisation on the biodiversity of a Festuca rubra meadow.
Long-Term Effect Of Levels Of N-, P-, K-Supply On The Shannon-Index For Two Pastures Located In Central Germany,
2023
Justus-Liebig-University Giessen, Germany
Long-Term Effect Of Levels Of N-, P-, K-Supply On The Shannon-Index For Two Pastures Located In Central Germany, Judith F. Oerlemans, W. Opitz Von Boberfeld
IGC Proceedings (2001-2021)
Intensive grassland production, including the use of mineral fertilisers, has degraded the botanical diversity of grassland communities seriously (Chapman, 2001). There is little information on optimal amounts of soil nutrient availability to maintain/regenerate species-rich grassland communities. This study in Central Germany aimed to quantify the long-term effect of different N-, P-, K-supply combinations on biodiversity, expressed in terms of the Shannon-Index (Sh-Id), of 2 pastures classified as Lolio-Cynosuretum.
The Effect Of Npk Fertilisation On Structure And Species Composition Of Grasslands,
2023
Mendel University in Brno, Czech Republic
The Effect Of Npk Fertilisation On Structure And Species Composition Of Grasslands, Frantisek Hrabě, Jiří Skládanka
IGC Proceedings (2001-2021)
Long-term research into the effect of N+PK nutrition enables an objective evaluation of the trend and rate of succession and a prediction of changes including production development in permanent grassland (Hrabě et al., 1991). Former research (Hrabě & Halva, 1993) and evaluation within an eco-system concept (Rychnovská et al., 1994) demonstrated marked changes in the species composition of grass communities with the application of N+PK fertilisation that did not correspond to the sward type and site conditions.
