Xem 1-20 trên 581 kết quả Fertility
  • Soil fertility describes soil nutrient status and the factors controlling the supply of nutrients to plants. Continued efforts to improve soil fertility are required to support the world's growing demand for food, fiber, and renewable fuels. Important ecological services provided by soils, such as biodiversity, buffering capacity, and nutrient recycling benefit from the amendments applied to sustain soil fertility. Those amendments need to be applied in a manner that is both economical and practical for the producer to achieve agronomic objectives that are environmentally sound.

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  • Soil fertility is critical for the provision of adequate food, fiber and renewable natural resources(fuel,wood etc.). In the developing world soil fertility is linked to economic well being of many farm families. Poor soils means poor harvest leading to low returns for the over 60% of the population of developing countries relying on agriculture for survival.Use of inorganic and organic fertilizers in addition to biological processes to improve the fertility of the soil requires good understanding of their practical use and management.

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  • The prevailing low food production in sub-Saharan Africa is an issue of great concern especially since Africa south of the Sahara is the only remaining region of the world where per capita food production has remained stagnant. This chapter reviews long-term experiments in Africa in the context of shifting paradigms related to tropical soil fertility management from fi rst external input paradigm right through to the current Integrated Soil Fertility Management (ISFM) approach, which is a culmination of the participatory methods developed along the paradigm shift.

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  • The focus of this volume, based on the 2002 conference ’Fertility: The Current South African Issues of Poverty, HIV/AIDS, and Youth’ emanating from the partnership between the Department of Social Development, the South African Regional Poverty Network (SARPN) and the HSRC, is to examine the underlying inextricable link between fertility and the socio-economic development.

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  • Several recent efforts in statistical natural language understanding (NLU) have focused on generating clumps of English words from semantic meaning concepts (Miller et al., 1995; Levin and Pieraccini, 1995; Epstein et al., 1996; Epstein, 1996). This paper extends the IBM Machine Translation Group's concept of fertility (Brown et al., 1993) to the generation of clumps for natural language understanding. The basic underlying intuition is that a single concept may be expressed in English as many disjoint clump of words. ...

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  • This publication presents agronomic reasons which have led to the development of controlled-release and stabilized fertilizers. The characteristics, the advantages and the possible disadvantages of controlled-release and nitrification/urease inhibitors are discussed. Particular attention is given to problems of legislation, registration, methodology and standardization. Leading manufacturers and their product ranges are listed.

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  • Invite you to consult the document content, "Fertilizer manual" below. Contents of the document referred to the content you: General concepts, classification, tenninology, and definitions, the role of fertilizers in agriculture, status of the fertilizer industry, fertilizer raw materials and reserves, compound fertilizers. Hopefully document content to meet the needs of learning, work effectively.

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  • Agromisa receives many questions about agricultural problems that directly or indirectly involve soil fertility problems. Often crop returns have decreased, so farmers want to know how to regain previous harvest levels. Lack of soil fertility causes decreased yields but many plant diseases are also related to poor soil fertility

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  • Part II: Soil fertility and fertilizing 8 Introduction and nutrient balance To ensure a sufficient nutrient supply for crops, we must strive to keep an even nutrient balance in the soil. The loss of nutrients has to be minimised, and the addition of nutrients maximised in order to avoid a depletion of nutrients in the soil.

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  • IVF and related treatments (GIFT and ZIFT, see below) are the most invasive ART treatments. Usually women try other methods first, and turn to IVF when those methods have not succeeded in pregnancy or live birth. One percent of babies in the US are born using IVF. Unlike AI, fertilization takes place outside the woman’s body in which eggs (retrieved from the woman trying to get pregnant or from an egg donor) are fertilized with sperm (from a partner or donor) in a Petri dish.

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  • The overall objective of the project is to reduce the use of N fertilizer use on legumes soybean and groundnut in Vietnam through by increasing legume inoculants. Replace N fertilizer with legume inoculants will provide both economic benefits and environmental benefits for farmers and reduce financial stress for poor farmers by reducing input costs. The approach is to raise awareness and demand for inoculants through an expanded program including live demonstrations of the benefits of inoculants and training in the functions and their use.

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  • The past three decades have witnessed significant advances in the field of assisted human conception. Following the remarkable perseverance and triumph of Robert Edwards, Patrick Steptoe, and Jean Purdy, numerous scientists and physicians from around the world have worked to develop more effective and safer procedures to treat infertile couples.

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  • Tham khảo sách 'fertilizers and their use', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Thorough evaluation of the infertile couple before in vitro fertilization (IVF) is critical in achieving the best outcomes and avoiding complications. Most IVF centers organize the evaluation by using a checklist that the nurse coordinator and physician assure is complete before proceeding with the cycle. DAY 3 FOLLICLE-STIMULATING HORMONE A level exceeding 25 mIU/ml (about 12 mIU/ml using current assays) has been correlated with a very low chance of pregnancy (1).

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  • Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Field effect of P fertilization on N2 fixation rate of Ulex europaeus...

    pdf7p toshiba5 15-09-2011 25 4   Download

  • The birth of the world’s first baby born as a result of in vitro fertilization (IVF) in July 1978 was by no means a chance event. Indeed, in the long evolution of reproduction, conception by IVF represents the end of a continuum which originated with childbirth wholly dependent on chance but which today is almost exclusively under human control. Today, nearly all forms of infertility can be treated by the various techniques of assisted reproduction, which are now responsible for the birth of around two million children worldwide. ...

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  • In this chapter, I will provide insights into the following areas of in vitro fertilization outcome. First, why we monitor in vitro fertilization (IVF) outcome. Second, why monitoring IVF outcome is not well done. Third, a brief overview of the known IVF literature. Fourth, how to do monitoring in an ideal world, and what outstanding questions have not been addressed which are of concern to families, fertility practitioners, the broader scientific community, and general public.

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: The extent of root rot damage in Norway spruce stands established on fertile sites of former agricultural land...

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Analysis of the aerial application of fertilizer and dolomitic limestone...

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Interaction of initial seedling diameter, fertilization and weed control on Douglas-fir growth over the first four years after planting"

    pdf11p toshiba4 20-09-2011 31 3   Download


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