Bacteria in Agrobiol
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Nutrient Management and Imbalances David H
98 Nutrient Management and Imbalances David H. Gent, J Robert Sirrine, and Heather M. Darby Hop plants produce abundant biomass in the form of bines, leaves, and cones. High- yielding plants such as hop require adequate nutrition. Many of the various nutrients required by hop may be deficient or in excess of the crop’s needs. It can be difficult to pinpoint the cause of abnormal plant symptoms, especially if multiple production factors lead to the same symptom. General symptoms associated with nutrient imbalances are described in this section, as well as known nutrient interactions with diseases and arthropod pests. Fertilization recommendations are beyond the scope of this pest management guide and are not provided. Recommendations vary widely in published literature, differing among production regions, varieties, irrigation methods, soil types, and production goals. Readers should seek input from local experts for guidance appropriate to their region and situation. Boron Iron Boron deficiency can result in delayed Iron deficiency is first observed on emergence of shoots; stunting, distortion, young leaves as yellowing between veins, and crinkling of young leaves (Fig. 257); while veins remain green (Fig. 260, right- and yellowing and death of shoot tips (Fig. hand image, and Fig. 261). Iron deficiency 258). Leaves of affected plants may be small is most common in alkaline soils, although and brittle, and may develop a fluffy-tipped it can be induced in highly acidic soils appearance due to impaired development (approximately pH 5.7 or less) because of lobes (Fig. 259). Deficiencies are most of enhanced solubility and uptake of common in acid and/or sandy textured soils. -
A Sustainable Approach for Improving Soil Properties and Reducing N2O Emissions Is Possible Through Initial and Repeated Biochar Application
agronomy Article A Sustainable Approach for Improving Soil Properties and Reducing N2O Emissions Is Possible through Initial and Repeated Biochar Application Ján Horák 1,* , Tatijana Kotuš 1, Lucia Toková 1, Elena Aydın 1 , Dušan Igaz 1 and Vladimír Šimanský 2 1 Department of Biometeorology and Hydrology, Faculty of Horticulture and Landscape Engineering, Slovak University of Agriculture, 949 76 Nitra, Slovakia; [email protected] (T.K.); [email protected] (L.T.); [email protected] (E.A.); [email protected] (D.I.) 2 Department of Soil Science, Faculty of Agrobiology and Food Resources, Slovak University of Agriculture, 949 76 Nitra, Slovakia; [email protected] * Correspondence: [email protected] Abstract: Recent findings of changing climate, water scarcity, soil degradation, and greenhouse gas emissions have brought major challenges to sustainable agriculture worldwide. Biochar application to soil proves to be a suitable solution to these problems. Although the literature presents the pros and cons of biochar application, very little information is available on the impact of repeated application. In this study, we evaluate and discuss the effects of initial and reapplied biochar (both in rates of 0, 10, and 20 t ha−1) combined with N fertilization (at doses of 0, 40, and 80 kg ha−1) on soil properties and N O emission from Haplic Luvisol in the temperate climate zone (Slovakia). Results showed that 2 biochar generally improved the soil properties such as soil pH(KCl) (p ≤ 0.05; from acidic towards Citation: Horák, J.; Kotuš, T.; Toková, moderately acidic), soil organic carbon (p ≤ 0.05; an increase from 4% to over 100%), soil water L.; Aydın, E.; Igaz, D.; Šimanský, V. -
Nutrient Deficiency Symptoms in Plants (DPI Vic)
April, 1995 Nutrient deficiency symptoms of AG0257 plants ISSN 1329-8062 David Beardsell, Knoxfield Plants must absorb certain elements to live and grow. Carbon (C), hydrogen (H), and oxygen (O) are the elements supplied from air and water. The growing media generally supplies the remaining nutrients required for plant growth. The major elements or macronutrients required by the plant are nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulphur (S). The minor elements, trace elements or micronutrients necessary for healthy plant production are molybdenum (Mo), copper (Cu), zinc (Zn), manganese (Mn), boron (B), iron (Fe), and chlorine (Cl). Deficiencies or imbalances in supply of these essential elements can cause growth reductions, and in more severe cases visual symptoms are expressed in leaves and flowers. Nitrogen deficiency (N) Nitrogen is required by plants in higher concentrations than any of the other elements, except potassium in certain instances. Plants grown without nitrogen grow very slowly. Plants are stunted and show a general yellowing of the foliage. The symptoms of nitrogen deficiency will first occur in the older leaves. The leaves turn from a pale green Figure 1. Symptoms of nitrogen deficiency include stunted plant colour to a yellow and eventually leaf drop occurs. The growth. The Eucalyptus gunni plant on the right hand side younger leaves remain green for longer periods of time but exhibits this symptom. The plant on the left hand side has an eventually the whole plant exhibits a pale green to yellow adequate supply of nitrogen. colour. Potassium deficiency (K) Phosphorus deficiency (P) Deficiency symptoms of potassium are also exhibited in Deficiency symptoms of this element, like nitrogen, are the older leaves of the plant first. -
Risk Analysis of Alien Grasses Occurring in South Africa
Risk analysis of alien grasses occurring in South Africa By NKUNA Khensani Vulani Thesis presented in partial fulfilment of the requirements for the degree of Master of Science at Stellenbosch University (Department of Botany and Zoology) Supervisor: Dr. Sabrina Kumschick Co-supervisor (s): Dr. Vernon Visser : Prof. John R. Wilson Department of Botany & Zoology Faculty of Science Stellenbosch University December 2018 Stellenbosch University https://scholar.sun.ac.za Declaration By submitting this thesis/dissertation electronically, I declare that the entirety of the work contained therein is my own, original work, that I am the sole author thereof (save to the extent explicitly otherwise stated), that reproduction and publication thereof by Stellenbosch University will not infringe any third party rights and that I have not previously in its entirety or in part submitted it for obtaining any qualification. Date: December 2018 Copyright © 2018 Stellenbosch University All rights reserved i Stellenbosch University https://scholar.sun.ac.za Abstract Alien grasses have caused major impacts in their introduced ranges, including transforming natural ecosystems and reducing agricultural yields. This is clearly of concern for South Africa. However, alien grass impacts in South Africa are largely unknown. This makes prioritising them for management difficult. In this thesis, I investigated the negative environmental and socio-economic impacts of 58 alien grasses occurring in South Africa from 352 published literature sources, the mechanisms through which they cause impacts, and the magnitudes of those impacts across different habitats and regions. Through this assessment, I ranked alien grasses based on their maximum recorded impact. Cortaderia sellonoana had the highest overall impact score, followed by Arundo donax, Avena fatua, Elymus repens, and Festuca arundinacea. -
Root-Knot Nematodes: Abundance in Organic Farming, Differentiation Among Populations, Microbes Attached to Juveniles in Soil, and Bacterial Antagonists
Mohamed Adam Mohamed Abdou Institut für Epidemiologie und Pathogendiagnostik Root-knot nematodes: abundance in organic farming, diff erentiation among populations, microbes attached to juveniles in soil, and bacterial antagonists Dissertationen aus dem Julius Kühn-Institut Julius Kühn-Institut Bundesforschungsinstitut für Kulturpfl anzen Kontakt: Mohamed Adam Mohamed Abdou Julius Kühn-Institut, Bundesforschungsinstitut für Kulturpflanzen (JKI) Institut für Epidemiologie und Pathogendiagnostik Messeweg 11/12 38104 Braunschweig Germany Von der Fakultät Architektur, Bauingenieurwesen und Umweltwissenschaften der Technischen Universität Carolo-Wilhelmina zu Braunschweig zur Erlangung des Grades eines Doktors der Naturwissenschaften (Dr. rer. nat.) genehmigte Dissertation Die Schriftenreihe ,,Dissertationen aus dem Julius Kühn-lnstitut" veröffentlicht Doktorarbeiten, die in enger Zusammenarbeit mit Universitäten an lnstituten des Julius Kühn-lnstituts entstanden sind Der Vertrieb dieser Monographien erfolgt über den Buchhandel (Nachweis im Verzeichnis lieferbarer Bücher - VLB) und OPEN ACCESS im lnternetangebot www.jki.bund.de Bereich Veröffentlichungen. Wir unterstützen den offenen Zugang zu wissenschaftlichem Wissen. Die Dissertationen aus dem Julius Kühn-lnstitut erscheinen daher OPEN ACCESS. Alle Ausgaben stehen kostenfrei im lnternet zur Verfügung: http://www.jki.bund.de Bereich Veröffentlichungen We advocate open access to scientific knowledge. Dissertations from the Julius Kühn-lnstitut are therefore published open access. All issues -
The Emergence of Cereal Fungal Diseases and the Incidence of Leaf Spot Diseases in Finland
AGRICULTURAL AND FOOD SCIENCE AGRICULTURAL AND FOOD SCIENCE Vol. 20 (2011): 62–73. Vol. 20(2011): 62–73. The emergence of cereal fungal diseases and the incidence of leaf spot diseases in Finland Marja Jalli, Pauliina Laitinen and Satu Latvala MTT Agrifood Research Finland, Plant Production Research, FI-31600 Jokioinen, Finland, email: [email protected] Fungal plant pathogens causing cereal diseases in Finland have been studied by a literature survey, and a field survey of cereal leaf spot diseases conducted in 2009. Fifty-seven cereal fungal diseases have been identified in Finland. The first available references on different cereal fungal pathogens were published in 1868 and the most recent reports are on the emergence of Ramularia collo-cygni and Fusarium langsethiae in 2001. The incidence of cereal leaf spot diseases has increased during the last 40 years. Based on the field survey done in 2009 in Finland, Pyrenophora teres was present in 86%, Cochliobolus sativus in 90% and Rhynchosporium secalis in 52% of the investigated barley fields.Mycosphaerella graminicola was identi- fied for the first time in Finnish spring wheat fields, being present in 6% of the studied fields.Stagonospora nodorum was present in 98% and Pyrenophora tritici-repentis in 94% of spring wheat fields. Oat fields had the fewest fungal diseases. Pyrenophora chaetomioides was present in 63% and Cochliobolus sativus in 25% of the oat fields studied. Key-words: Plant disease, leaf spot disease, emergence, cereal, barley, wheat, oat Introduction nbrock and McDonald 2009). Changes in cropping systems and in climate are likely to maintain the plant-pathogen interactions (Gregory et al. -
Bacteria in Agrobiology: Stress Management
Bacteria in Agrobiology: Stress Management Bearbeitet von Dinesh K. Maheshwari 1. Auflage 2012. Buch. XII, 333 S. Hardcover ISBN 978 3 642 23464 4 Format (B x L): 15,5 x 23,5 cm Gewicht: 684 g Weitere Fachgebiete > Chemie, Biowissenschaften, Agrarwissenschaften > Entwicklungsbiologie > Bakteriologie (nichtmedizinisch) Zu Inhaltsverzeichnis schnell und portofrei erhältlich bei Die Online-Fachbuchhandlung beck-shop.de ist spezialisiert auf Fachbücher, insbesondere Recht, Steuern und Wirtschaft. Im Sortiment finden Sie alle Medien (Bücher, Zeitschriften, CDs, eBooks, etc.) aller Verlage. Ergänzt wird das Programm durch Services wie Neuerscheinungsdienst oder Zusammenstellungen von Büchern zu Sonderpreisen. Der Shop führt mehr als 8 Millionen Produkte. Chapter 2 The Management of Soil Quality and Plant Productivity in Stressed Environment with Rhizobacteria Dilfuza Egamberdieva 2.1 Introduction The urgency of feeding the world’s growing population while combating soil pollution, salinization, and desertification has given plant and soil productivity research vital importance. Under such circumstances, it requires suitable biotech- nology not only to improve crop productivity but also to improve soil health through interactions of plant roots and soil microorganisms (Lugtenberg et al. 2002). Interest in bacterial fertilizers has increased, as it would substantially reduce the use of chemical fertilizers and pesticides which often contribute to the pollution of soil–water ecosystems. Presently, about 20 biocontrol products based on Pseu- domonas, Bacillus, Streptomyces, and Agrobacterium strains have been commercialized, but there still is a need to improve the efficacy of these biocontrol products (Copping 2004; Chebotar et al. 2000; Lugtenberg and Kamilova 2004). Soil salinity disturbs the plant–microbe interaction, which is a critical ecological factor to help further plant growth in degraded ecosystems (Paul and Nair 2008). -
Shropshire Fungus Checklist 2010
THE CHECKLIST OF SHROPSHIRE FUNGI 2011 Contents Page Introduction 2 Name changes 3 Taxonomic Arrangement (with page numbers) 19 Checklist 25 Indicator species 229 Rare and endangered fungi in /Shropshire (Excluding BAP species) 230 Important sites for fungi in Shropshire 232 A List of BAP species and their status in Shropshire 233 Acknowledgements and References 234 1 CHECKLIST OF SHROPSHIRE FUNGI Introduction The county of Shropshire (VC40) is large and landlocked and contains all major habitats, apart from coast and dune. These include the uplands of the Clees, Stiperstones and Long Mynd with their associated heath land, forested land such as the Forest of Wyre and the Mortimer Forest, the lowland bogs and meres in the north of the county, and agricultural land scattered with small woodlands and copses. This diversity makes Shropshire unique. The Shropshire Fungus Group has been in existence for 18 years. (Inaugural meeting 6th December 1992. The aim was to produce a fungus flora for the county. This aim has not yet been realised for a number of reasons, chief amongst these are manpower and cost. The group has however collected many records by trawling the archives, contributions from interested individuals/groups, and by field meetings. It is these records that are published here. The first Shropshire checklist was published in 1997. Many more records have now been added and nearly 40,000 of these have now been added to the national British Mycological Society’s database, the Fungus Record Database for Britain and Ireland (FRDBI). During this ten year period molecular biology, i.e. DNA analysis has been applied to fungal classification. -
Agricultural and Food Science, Vol. 20 (2011): 117 S
AGRICULTURAL AND FOOD A gricultural A N D F O O D S ci ence Vol. 20, No. 1, 2011 Contents Hyvönen, T. 1 Preface Agricultural anD food science Hakala, K., Hannukkala, A., Huusela-Veistola, E., Jalli, M. and Peltonen-Sainio, P. 3 Pests and diseases in a changing climate: a major challenge for Finnish crop production Heikkilä, J. 15 A review of risk prioritisation schemes of pathogens, pests and weeds: principles and practices Lemmetty, A., Laamanen J., Soukainen, M. and Tegel, J. 29 SC Emerging virus and viroid pathogen species identified for the first time in horticultural plants in Finland in IENCE 1997–2010 V o l . 2 0 , N o . 1 , 2 0 1 1 Hannukkala, A.O. 42 Examples of alien pathogens in Finnish potato production – their introduction, establishment and conse- quences Special Issue Jalli, M., Laitinen, P. and Latvala, S. 62 The emergence of cereal fungal diseases and the incidence of leaf spot diseases in Finland Alien pest species in agriculture and Lilja, A., Rytkönen, A., Hantula, J., Müller, M., Parikka, P. and Kurkela, T. 74 horticulture in Finland Introduced pathogens found on ornamentals, strawberry and trees in Finland over the past 20 years Hyvönen, T. and Jalli, H. 86 Alien species in the Finnish weed flora Vänninen, I., Worner, S., Huusela-Veistola, E., Tuovinen, T., Nissinen, A. and Saikkonen, K. 96 Recorded and potential alien invertebrate pests in Finnish agriculture and horticulture Saxe, A. 115 Letter to Editor. Third sector organizations in rural development: – A Comment. Valentinov, V. 117 Letter to Editor. Third sector organizations in rural development: – Reply. -
Iron (Fe) Nutrition of Plants1 George Hochmuth2
SL353 Iron (Fe) Nutrition of Plants1 George Hochmuth2 Introduction are on the order of 10-15 molar (very low concentration). As pH increases by one unit, activity of Fe+++ decreases by Iron is one of 16 essential elements for plant growth and 1000-fold due to the formation of insoluble Fe +++hydroxide. reproduction (some scientists also consider nickel to be Under reducing conditions—addition of H+ or other essential, making 17 in total). Iron (Fe) is one of the most reductants—Fe solubility increases. Under such situations, abundant elements on the planet. In 1844, Eusebe Gris Fe can be adsorbed on soil as an exchangeable ion. showed that certain chlorosis in plants could be reversed by treating roots and leaves with iron solutions. Iron is a In certain soil situations, carbonate or sulfide compounds micronutrient and is required by plants in small amounts. may form with Fe. Commonly in waterlogged situations, Most annual plants have a requirement for Fe on the order ferric iron is reduced to the ferrous state. If sulfates also of 1 to 1.5 lb Fe per acre, compared with nitrogen (N) at 80 are abundant in the soil, these become oxygen sources for to 200 lb per acre. This publication provides information bacteria and black-colored ferrous sulfide is formed on plant nutrition and soil fertility for agricultural and urban plant production and management practitioners. The Where organic matter is present in soils, Fe may be present information should provide a detailed basic understanding in its reduced state as Fe++ in the soil solution or adsorbed of soil science and plant physiology for diagnosing and onto soil particle surfaces. -
Citrus Fertilizer Management on Calcareous Soils Page 3 Sufficiency Level for Use with Citrus Grown on Florida Susceptibility To
Citrus Fertilizer Management on Calcareous Soils Page 3 sufficiency level for use with citrus grown on Florida Susceptibility to Fe chlorosis depends on a plant's calcareous soils, response to Fe deficiency stress, which is controlled genetically. Citrus rootstocks vary widely in their THE EFFECT OF CaCO, ON ZINC AND ability to overcome low Fe stress (see Table 2). The MANGANESE easiest way to avoid lime-induced Fe chlorosis in citrus trees to be planted on calcareous soils is to use Soil pH is the most important factor regulating tolerant rootstocks. Existing Fe chlorosis can be Zn and Mn supply in alkaline soils. At alkaline (high) corrected by using organic chelates, a method pH values, Zn and Mn form precipitous compounds discussed in detail in a later section. with low water solubility, markedly decreasing their availability to plants. A soil pH value of less than 7 FERTILIZER MANAGEMENT ON is preferred to ensure that Zn and Mn are available CALCAREOUS SOILS to plants in sufficient amounts. The soil around a plant root (the rhizosphere) tends to be acidic due to Nitrogen. Regardless of the initial form applied, root exudation of H' ions. Therefore, soils that are essentially all N fertilizer ultimately exists as N03- slightly alkaline may not necessarily be deficient in Zn because nitrification proceeds uninhibited in or Mn. In addition, Zn and Mn can be chelated by calcareous soils. Rather than attempt to slow this natural organic compounds in the soil, a process that process, citrus grove management practices should aids the movement of these nutrients to the plant emphasize irrigation and fertilizer application root. -
Visual Symptoms: a Handy Tool in Identifying Nutrient Deficiency in Corn, Cotton and Soybean
W 976 Visual Symptoms: A Handy Tool in Identifying Nutrient Deficiency in Corn, Cotton and Soybean Nutifafa Adotey, Assistant Professor and Tyson Raper, Associate Professor and Soil and Nutrient Management Specialist Cotton and Small Grain Specialist Angela McClure, Professor and Corn and Robert Florence, Director, UT Soil, Plant Soybean Specialist and Pest Center Generally, a nutrient deficiency occurs as a result of low necrosis, which occurs when the plant tissue dies. Necrosis soil nutrient levels. However, prevailing environmental is commonly associated with N, phosphorus (P), and conditions, soil properties, growth conditions and root potassium (K) deficiencies. Abnormal growth occurs when diseases may restrict nutrient uptake and induce deficiencies inadequate amounts of a nutrient in the plant restrict cell in crops even if soil nutrient levels are estimated sufficient elongation and replication resulting in stunted growth, for optimum yield. For example, low or high soil pH, soil deformation or crinkled leaves. compaction and excessively wet or dry soil may prevent Where the symptomology occurs on the plant depends nutrient uptake. A handy diagnostic tool to identify nutrient on the mobility of the nutrient within the plant (Figure 1). deficiency in crops is via visual observation of symptoms. Plant nutrients can be classified as mobile or immobile However, this tool may not always provide a definite within the plant. Mobile nutrients such as N, P, K and Mg diagnosis of the nutrient status of the plant. Keep in mind can be translocated from the older leaves to the developing other conditions are capable of inducing symptoms that plant parts. Hence, deficiency symptoms tend to show on closely resemble those of nutrient deficiencies.