Evaluacion de la eficiencia de cuatro practicas mecanicas para reducir las perdidas de suelo y nutrimentos por erosion hidrica en terrenos agricolas de temporal PDF Download

Author: A. Trueba Carranza
Publisher:
ISBN:
Category :
Languages : es
Pages : 190

View

Book Description
Avaliar as diferentes praticas de conservacao do solo e da agua com base em sua efetividade para reduzir as perdas de solo e nutrientes, gerar os coeficientes de eficiencia que garantam a capacidade de obras para reduzir a erosao, determinar o efeito destas praticas sobre o rendimento de milho em graos e finalmente obter a analise economica das obras com base nos beneficios e custos que implica seu estabelecimento e operacao.

Author: A. T. Carranza
Publisher:
ISBN:
Category :
Languages : es
Pages : 190

View

Book Description
En el campo experimental temporalero de la Universidad Autonoma de Chapingo, Mex. ubicado sobre el parteaguas SW de la cuenca del rio Tezcoco, se realizo el presente trabajo con la finalidad de evaluar las diferentes practicas de conservacion del suelo y del agua con base en su efectividad para reducir las perdidas de suelo y nutrimentos, generar los coefientes de eficiencia que reflejan la capacidad de las obras para reducir la erosion, determinar el efecto de esas practicas sobre el rendimiento de maiz engrano y finalmente obtener el analisis economico de las obr as con base en los beneficios y costos que implica su estabelecimento y operacion. Los tratamientos se seleccionaron con base en aspectos economicos, operativos y al tipo de obra mas comunmente empleados en los programas de conservacion de suelos en Mexico. Las praticas seleccionadas fueron las seguientes: 1. Testigo - surcos rectos perpendiculares a la pendiente principal del terreno. 2. Surcado al contorno. 3. Terraza de base angosta SARH. 4. Terraza de base angosta CP. 5. Terraza de banco. Para poder lograr los objetivos de la experimentacion - hubo necesidad de establecer parcelas de 0.703 ha por lo que solo se emplearon dos repeticones bajo un diseno completamente al azar. Para disenar la capacidad de los canales de conduccion, del sistema de muestreo y el drenaje del area experimental, se calculo el escurrimiento maximo esperado con un periodo de retorno de 5 anos con base en el metodo racional modificado. La metologia empleada tanto para el ...

Author: Alejandro Trueba Carranza
Publisher:
ISBN:
Category :
Languages : es
Pages : 378

View

Book Description

Author: Samir A. El-Swaify
Publisher: CRC Press
ISBN:
Category : Nature
Languages : en
Pages : 776

View

Book Description
Introduction, rationale, and relevance of MODSS. Addressing diverse client needs. MODSS methodologies, tools, components, and integration. Applicability to economic, social, policy, risk, and sustainability issues. Applicability to national, regional, and global issues.

Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1172

View

Book Description

Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 756

View

Book Description

Author: E.G. Gregorich
Publisher: Elsevier
ISBN: 0080541402
Category : Technology & Engineering
Languages : en
Pages : 465

View

Book Description
Soil is a complex body that exists as many types, each with diverse properties that may vary widely across time and space as a function of many factors. This complexity makes the evaluation of soil quality much more challenging than that of water or air quality. Evaluation of soil quality now considers environmental implications as well as economic productivity, seeking to be more holistic in its approach.Thus, soil quality research draws from a wide range of disciplines, blending the approaches of biologists, physicists, chemists, ecologists, economists and agronomists, among others.This book presents a broad perspective of soil quality that includes these various perspectives and gives a strong theoretical basis for the assessment of soil quality.A short glossary provides definitions for terms used throughout the book.

Author: Dennis Dalton
Publisher: Columbia University Press
ISBN: 0231530390
Category : History
Languages : en
Pages : 353

View

Book Description
Dennis Dalton's classic account of Gandhi's political and intellectual development focuses on the leader's two signal triumphs: the civil disobedience movement (or salt satyagraha) of 1930 and the Calcutta fast of 1947. Dalton clearly demonstrates how Gandhi's lifelong career in national politics gave him the opportunity to develop and refine his ideals. He then concludes with a comparison of Gandhi's methods and the strategies of Martin Luther King Jr. and Malcolm X, drawing a fascinating juxtaposition that enriches the biography of all three figures and asserts Gandhi's relevance to the study of race and political leadership in America. Dalton situates Gandhi within the "clash of civilizations" debate, identifying the implications of his work on continuing nonviolent protests. He also extensively reviews Gandhian studies and adds a detailed chronology of events in Gandhi's life.

Author: M.H. Zimmermann
Publisher: Springer Science & Business Media
ISBN: 3642661610
Category : Science
Languages : en
Pages : 548

View

Book Description
When WILHELM RUHLAND developed his plan for an Encyclopedia of Plant Physiol ogy more than three decades ago, biology could still be conveniently subdivided into classical areas. Even within plant physiology, subdivisions were not too difficult to make, and general principles could be covered sufficiently in the two introductory volumes of the Encyclopedia on the physical and chemical basis of cell biology. But the situation changed rapidly even during the 12-year publication period of the Encyclopedia (1955-1967). The new molecular direction of genetics and structural research on biopolymers had an integrating effect on all other biological fields, including plant physiology, and it became increasingly difficult to keep previously distinct areas separated. RUHLAND'S overall plan included 18 volumes and about 22,000 pages. It covered the entire field of plant physiology, in most cases from the very beginning. But, as each volume appeared, it was clear that its content would soon be outdated.

Author: Sukhada Mohandas
Publisher: Springer
ISBN: 9811015856
Category : Science
Languages : en
Pages : 345

View

Book Description
Bananas and plantains are among the most important food and cash crops in the world. They are cultivated in more than 135 countries, across the tropics and subtropics, with an annual global production of ca. 130 million metric tonnes. Though bananas are one of the most important components of food security in many developing countries, banana production is threatened by both abiotic and biotic stresses. These include a wide range of diseases and pests, such as bunchy top virus, burrowing nematodes, black Sigatoka or black leaf streak, Fusarium wilt, etc. In recent years, considerable progress has been made and several biotechnological and genomic tools have been employed to help understand and unravel the mysterious banana genome. Molecular and genomic studies have helped to decipher the Musa genome and its evolution. Genetic linkage map and whole genome sequencing of both Musa acuminata and Musa balbisiana (progenitors of cultivated banana) have completely changed the way of thinking and the approach on banana crop improvement. Whole-genome sequencing has helped to improve the selection of quantitative traits such as yield, as well as the selection of optimal parents for developing required hybrids in breeding programs. Gene isolation and the analysis of mutants have helped in the characterization of genes of agronomic value and the associated regulatory sequences. With the advent of molecular markers and new statistical tools, it is now possible to measure the diversity, identify genes and useful alleles linked to important agronomic traits. Further these alleles can be incorporated into cultivars through marker assisted selection or through transgenic approach. Transgenic approaches are potential tools for direct transfer of these genes into popular cultivars, which are generally not amenable for conventional breeding techniques, in specific with crops such as bananas which are sterile, triploid and heterozygous thereby making it difficult to reconstruct the recurrent genotypes in banana. Transgenic techniques thus have helped overcome the difficulty of working with sterile, triploid banana crop. In the last five years, enormous amount of new information and techniques have been generated for banana. A comprehensive book entitled “Banana: Genomics and Transgenic Approaches for Genetic improvement” on banana genomics, latest transgenic technologies and tools available for improved crop development in banana will address all these requirements.