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Influencia Da Incorporacao De Adubos E Corretivos Em Profundidade Na Cultura Do Milho Zea Mays L Sob Deficit Hidrico Induzido Em Solo De Cerrado
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Book Synopsis Influencia da incorporacao de adubos e corretivos em profundidade, na cultura do milho (Zea mays L.), sob deficit hidrico induzido em solo de cerrado by : A. dos S. ALONCO
Download or read book Influencia da incorporacao de adubos e corretivos em profundidade, na cultura do milho (Zea mays L.), sob deficit hidrico induzido em solo de cerrado written by A. dos S. ALONCO and published by . This book was released on 1990 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Efeitos do sistema de plantio do milho (Zea mays L.) e da rotacao com a soja sobre algumas caracteristicas fisicas do solo e comportamento da cultura by : L.A. Daniel
Download or read book Efeitos do sistema de plantio do milho (Zea mays L.) e da rotacao com a soja sobre algumas caracteristicas fisicas do solo e comportamento da cultura written by L.A. Daniel and published by . This book was released on 1984 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considerando que o comportamento da cultura e influenciado pelas caracteristicas fisicas, quimica e bioquimicas do meio onde se desenvolve e, como o metodo de manejo do solo assim como os tratos culturais empregados podem modificar tais caracteristicas, procurou-se, com o presente trabalho, estudar o comportamento da cultura do milho, com e sem rotacao com a cultura de soja, cultivadas atraves dos sistemas de plantio direto e convencional. Tais estudos basearam-se no ensaio desenvolvido em area experimental do campus da UNESP, localizado em Jaboticabal - SP., durante o ano agricola 82/83, em condicoes reais de campo. O ensaio desenvolveu-se durante o periodo de outubro de 1982 a abril de 1983, a partir do qual foram levantados informacoes quanto as seguintes caracteristicas fisicas do solo: temperatura, tensao de agua, densidade aparente e resistencia a penetracao. Com relacao ao comportamento da cultura do milho ao longo do ciclo, foram feitas determinacoes da altura, acumulo de materia seca, area foliar, producao de graos e indice de produtividade. Da analise dos resultados obtidos, evidenciaram-se algumas conclusoes como: os dois sistemas de cultivo nao mostraram por si so, influencia no comportamento da cultura do milho; o sistema de plantio direto promoveu menores variacoes de temperatura e de tensao de agua no solo, na fase de germinacao e emergencia da cultura, assim como determinou maiores valores de resistencia do solo a penetracao em sua camada superficial (ate 20,0 cm de profundidade), quando (...).
Book Synopsis Resposta da cultura do milho (Zea mays L.) a adubacao nitrogenada, sob semeadura direta na regiao do cerrado by : F.M. Fernandes
Download or read book Resposta da cultura do milho (Zea mays L.) a adubacao nitrogenada, sob semeadura direta na regiao do cerrado written by F.M. Fernandes and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Balanco de nitrogenio (15N) na cultura do milho (Zea mays L) em um latossolo vermelho-escuro fase cerrado by : A. M. Coelho
Download or read book Balanco de nitrogenio (15N) na cultura do milho (Zea mays L) em um latossolo vermelho-escuro fase cerrado written by A. M. Coelho and published by . This book was released on 1987 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimento de campo, foi conduzido em Latossol Vermelho-Escuro fase cerrado, no Centro Nacional de Pesquisa de Milho e Sorgo (EMBRAPA), Sete Lagoas, MG, com a finalidade de estabelecer o balanco do nitrogenio no sistema solo-planta da cultura do milho (Zea mays L.) atraves de tecnica do 15N. Utilizou-se o delineamento experimental em blocos casualizados com quatro repeticoes e oito tratamentos, envolvendo fontes de nitrogenio (ureia e sulfato de amonio), doses (0; 10; 40; 70; 130 e 250 kgN/ha, sendo 10 gk no plantio e o restante em cobertura) e metodos de aplicacao (na superficies e incorporado no solo). A ureia, contendo 5,505 atomos % de 15N em excesso, foi aplicada na dose de 60 kgN/ha, na superficie e incorporada a 7,5cm no solo. O sulfato de amonio, na dose de 60 kgN/ha, foi aplicado na superficie do solo. Para as doses de 30; 120 e 240 kgN/ha, utilizou-se ureia, incorporada no solo. Na colheita, amostras de material de planta (graos, sabugo, folha, colmo + pendao e raizes) e solo () - 15; 15-30; 30 - 45; 45 - 60; 60 - 90; 90 - 120 e 120 - 150 cm), foram analizadas para nitrogenio total e atamos % de 15N, sendo tambem determinado o nitrogenio no solo proveniente do fertilizante, nas formas inorganicas. Com base nos resultados obtidos, pode-se concluir que: a) houve pronunciada resposta na producao a aplicacao de nitrogênio com um incremento de 80% no rendimento de graos da dose zero para 120 kgN/ha (3943 para 7110 kg/ha respectivamente); b) a dose de nitrogenio necessaria para atingir 90% da producao (...).
Book Synopsis Vegetation of the Earth and Ecological Systems of the Geo-biosphere by : Heinrich Walter
Download or read book Vegetation of the Earth and Ecological Systems of the Geo-biosphere written by Heinrich Walter and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phytomass and Primary Production of the Various Vegetational Zones and of the Entire Biosphere The biosphere is that thin layer at the earth's surface in which living organisms exist and biological cycling takes place. It includes the upper horizons of the soil in which plants root, the atmosphere near the ground, (insofar as organisms penetrate this space), and all the surface waters. More than 99% of the earth's biomass is phytomass, to which we shall limit our discussion. Amounts of phytomass are distinctly related to vegeta tional zones. Because accurate determination of phytomass and primary production is difficult, only gross estimates have been available until recently. However, in 1970, Bazilevich et al. published (in Russian) more accurate calculations, based on the rapidly accumulating literature, for the various thermal zones and bioclimatic regions of the earth. These authors calculated mean phyto mass and mean annual primary production for the various regions as dry mass (in tons) per hectare. On the basis of measurements of the areas covered by the individual regions, excluding rivers, lakes, glaciers, and permanent snow, total phytomass and total annual primary production for the various regions were obtained (see table). The sum of these figures is the phytomass and annual production of the land surface of the earth. In addition, the table gives corresponding data for the waters of the earth. The values involved are potential i. e. , they are based on natural vegetation uninfluenced by man.
Book Synopsis Climate Dynamics of the Tropics by : S. Hastenrath
Download or read book Climate Dynamics of the Tropics written by S. Hastenrath and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first edition of my book "Climate and Circulation of the Tropics" was reasonably up to date to the middle of 1985. In a second printing in 1988 it was possible to complete a few literature references and to correct some misprints. However, vigorous research has taken place over the past five years in various areas of tropical climate dynamics, especially in the atmosphere-ocean mechanisms of climate anomalies, climate prediction, ocean circulation, and paleoclimates. Promising progress has also been made in the application of general circulation modelling to tropical climate problems. In the present second edition, named "Climate Dynamics of the Tropics", I have attempted to incorporate much of the recent work to late 1990. Chapters 8 and 9 have been essentially re-written, and major additions have been made to Chapters 4 and 12 in particular. I would like to acknowledge the continued support by the U.S. National Science Foundation over the past five years. B. Parthasarathy, Poona, and H. Lessmann, San Salvador, sent me updates of data series not easily accessible. I have benefitted from discussions with numerous colleagues in the United States and overseas. In the preparation of this second edition, Marilyn Wolff patiently transferred my illegible hand-written drafts onto word processor. Dierk Polzin and Dan Skemp assisted me with the creation of the page masters and the subject index and Christopher Collimore with the author index.
Book Synopsis Fire and Plants by : William J. Bond
Download or read book Fire and Plants written by William J. Bond and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large regions of the world are regularly burnt either deliberately or naturally. However, despite the widespread occurrence of such fire-prone ecosystems, and considerable body of research on plant population biology in relation to fire, until now there have only been limited attempts at a coherent conceptual synthesis of the field for use by students or researchers.
Book Synopsis The Cerrados of Brazil by : Paulo S.
Download or read book The Cerrados of Brazil written by Paulo S. and published by Columbia University Press. This book was released on 2013-02-05 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: The massive grasslands of Brazil -- known as the cerrados -- which cover roughly a quarter of its land surface and are among the most threatened regions in South America, have received little media attention. This book brings together leading researchers on the area to produce the first detailed account in English of the natural history and ecology of the cerrado/savanna ecosystem. Given their extent and threatened status, the richness of their flora and fauna, and the lack of familiarity with their unique ecology at the international level, the cerrados are badly in need of this important and timely work.
Download or read book Vegetation history written by B. Huntley and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis of vegetation history is one of the prime objectives for vegetation scientists. In order to understand the recent composition of local floras and plant communities a second knowledge of species com position during recent millenia is essential. With the present concern over climate changes, due to human activities, an understanding of past vegeta tion distribution becomes even more important, since the correlation between climate and vegetation can often be used to predict possible impacts to crops and forests. I was very fortunate to receive the help of Drs. Webb and Huntley to compile this volume on vegetation history. They have collated an impres sive set of papers which together give an account of the vegetation history of most of the continents during the late-Tertiary and Quaternery periods. There are, however, gaps in the coverage achieved, most notably Africa, and Asia apart from Japan. The information in this book will nonetheless certainly be used widely by vegetation scientists for the regions covered in the book and much of it has relevance to the areas not explicitly described. The authors of the individual chapters have done their best to cover recent topics of interest as well as established facts. It is intended that a separate volume will be produced in the near future covering the vegetation history of Africa and Asia. I thank the editors of It fits well into the this volume for their commendable achievement.
Download or read book Vegetation Dynamics written by R. Knapp and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the International Botanical Congress in Edinburgh, 1964, Mrs. 1. M. WEISBACH-J UNK of The Hague discussed a plan for preparation by her publishing company (Dr. W. Junk b.v.) of an international Handbook of Vegetation Science. She proposed a series that should give a comprehensive survey of the varied directions within this science, and their achievements to date as well as their objectives for the future. The challenge of such an enterprise, and its evident value for the further development of vegetation research, induced the undersigned after some consideration to accept the offer of the honorable but also burdensome task of General Editor. The decision was encouraged by a well formulated and detailed outline for the Handbook worked out by the Dutch phytosociolo gists J. J. BARKMAN and V. WESTHOFF. A circle of scholars from numerous countries was invited by the Dr. Junk Publishing Com pany to The Hague in January 1966 to draw up a list of editors and contributors for the parts of the Handbook. The outline and list have served since for the organization of the Handbook, with no need for major change. The different burdens of editors and authors have compelled quite different timings for completion of the individual sections.
Book Synopsis The Ecology and Management of Grazing Systems by : John Hodgson
Download or read book The Ecology and Management of Grazing Systems written by John Hodgson and published by Cabi. This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The understanding and management of land resources used by grazing animals are of major importance to ecologists and agricultural and environmental scientists. This book fills a major gap in the market by synthesising a range of perspectives on grazing systems, drawn from plant science, animal science and ecology. It outlines the principles of herbage growth and competition; of animal nutrition and grazing behavior; and of the interactions of plant and animal factors that are central to an understanding of grazing systems. Chapters on the management of grazing systems cover both intensive and extensive systems (including rangelands) from all major agroecological zones of the world. The book is written by leading authorities from the USA, UK, Australia, New Zealand, South Africa, Israel and France. It represents a major contribution to the literature for advanced students and research workers concerned with plant science (especially grasslands), animal science (especially ruminants), and natural and agricultural ecosystems.
Book Synopsis Grasses and Grasslands by : James R. Estes
Download or read book Grasses and Grasslands written by James R. Estes and published by . This book was released on 1982 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
