intTypePromotion=4
ADSENSE

Plant nutrient

Xem 1-20 trên 86 kết quả Plant nutrient
  • A plant nutrient is a chemical element that is essential for plant growth and reproduction. Essential element is a term often used to identify a plant nutrient. The term nutrient implies essentiality, so it is redundant to call these elements essential nutrients. Commonly, for an element to be a nutrient, it must fit certain criteria. The principal criterion is that the element must be required for a plant to complete its life cycle. The second criterion is that no other element substitutes fully for the element being considered as a nutrient.

    pdf663p augi20 24-04-2012 120 50   Download

  • The soils of the South American llanos and cerrado grasslands are predominantly old soils from which most of the plant nutrients have been lost. In many places there are layers of laterite (see the sidebar), which give them a red or yellow color. African savanna soils are much younger and more fertile. These shade into arid soils in the north and into wetter soils on high ground. On the southern side there are poor, exhausted, lateritic soils typical of tropical rain forest.

    pdf233p ktct_1669 08-05-2012 57 15   Download

  • Deficit plant nutrients, especially nitrogen, and weed competition are the most critical problems in organic farming. This research was carried out on research plots of the Agricultural Research and Extension Center of Atatürk University Agricultural Faculty during the cropping seasons of 2006–07, 2007–08, and 2008–09 under dry farming conditions.

    pdf10p vimb123 11-01-2019 10 0   Download

  • The objective of this study was to evaluate grain yield and yield components of popcorn with different nitrogen rates and plant densities. Field studies were conducted in 1995 and 1996 at Kazova Plain in Tokat. The experiment was designed in a randomized-complete-block design with a split-plot arrangement with three replications.

    pdf9p aquaman27 15-01-2019 10 0   Download

  • Tài liệu Plants and the environment provides about plants need the environment; plants use land and water; plants get food and water from the soil; their roots grow in the soil; the roots soak up water and nutrients; plants use animals and other plants;...

    pdf28p thieulam5782 04-10-2015 60 18   Download

  • This textbook covers Plant Ecology from the molecular to the global level.

    pdf0p phoebe75 01-02-2013 65 17   Download

  • “Have you thanked a green plant today?” reads a popular bumper sticker. Indeed, we should thank green plants for providing the food we eat, fiber for the clothing we wear, wood for building our houses, and the oxygen we breathe. Without plants, humans and other animals simply could not exist. Psychologists tell us that plants also provide a sense of well-being and peace of mind, which is why we preserve forested parks in our cities, surround our homes with gardens, and install plants and flowers in our homes and workplaces.

    pdf153p cronus75 14-01-2013 47 16   Download

  • 14 Nickel Nickel (Ni), the most recently discovered essential element (1), is unique among plant nutrients in that its metabolic function was determined well before it was determined that its deficiency could disrupt plant growth.

    pdf16p trasua1 21-09-2010 67 12   Download

  • Conclusion.Chapters in this handbook summarize research for each of the plant nutrients and several beneficial elements, and readers should refer to the individual chapters for information on past, current, and future research on these elements.

    pdf49p trasua1 21-09-2010 64 12   Download

  • MINERAL NUTRIENTS ARE ELEMENTS acquired primarily in the form of inorganic ions from the soil. Although mineral nutrients continually cycle through all organisms, they enter the biosphere predominantly through the root systems of plants, so in a sense plants act as the “miners” of Earth’s crust (Epstein 1999). The large surface area of roots and their ability to absorb inorganic ions at low concentrations from the soil solution make mineral absorption by plants a very effective process.

    pdf20p anhphuonggl 11-04-2013 70 10   Download

  • IN CHAPTER 5 WE DISCUSSED plants’ requirements for mineral nutrients and light in order to grow and complete their life cycle. Because living organisms interact with one another and their environment, mineral nutrients cycle through the biosphere. These cycles involve complex interactions, and each cycle is critical in its own right. Because the amount of matter in the biosphere remains constant, energy must be supplied to keep the cycles operational. Otherwise increasing entropy dictates that the flow of matter would ultimately stop.

    pdf26p anhphuonggl 11-04-2013 55 10   Download

  • SURVIVAL ON LAND POSES SOME SERIOUS CHALLENGES to terrestrial plants, foremost of which is the need to acquire and retain water. In response to these environmental pressures, plants evolved roots and leaves. Roots anchor the plant and absorb water and nutrients; leaves absorb light and exchange gases. As plants increased in size, the roots and leaves became increasingly separated from each other in space. Thus, systems evolved for long-distance transport that allowed the shoot and the root to efficiently exchange products of absorption and assimilation.

    pdf30p anhphuonggl 11-04-2013 65 10   Download

  • HIGHER PLANTS ARE AUTOTROPHIC ORGANISMS that can synthesize their organic molecular components out of inorganic nutrients obtained from their surroundings. For many mineral nutrients, this process involves absorption from the soil by the roots (see Chapter 5) and incorporation into the organic compounds that are essential for growth and development. This incorporation of mineral nutrients into organic substances such as pigments, enzyme cofactors, lipids, nucleic acids, and amino acids is termed nutrient assimilation....

    pdf24p anhphuonggl 11-04-2013 66 9   Download

  • A plant nutrient is a chemical element that is essential for plant growth and reproduction. Essential element is a term often used to identify a plant nutrient. The term nutrient implies essentiality, so it is redundant to call these elements essential nutrients. Commonly, for an element to be a nutrient, it must fit certain criteria. The principal criterion is that the element must be required for a plant to complete its life cycle. The second criterion is that no other element substitutes fully for the element being considered as a nutrient.

    pdf662p cronus75 14-01-2013 64 8   Download

  • PLANT CELLS ARE SEPARATED from their environment by a plasma membrane that is only two lipid molecules thick. This thin layer separates a relatively constant internal environment from highly variable external surroundings. In addition to forming a hydrophobic barrier to diffusion, the membrane must facilitate and continuously regulate the inward and outward traffic of selected molecules and ions as the cell takes up nutrients, exports wastes, and regulates its turgor pressure.

    pdf22p anhphuonggl 11-04-2013 56 7   Download

  • THE CYTOKININS WERE DISCOVERED in the search for factors that stimulate plant cells to divide (i.e., undergo cytokinesis). Since their discovery, cytokinins have been shown to have effects on many other physiological and developmental processes, including leaf senescence, nutrient mobilization, apical dominance, the formation and activity of shoot apical meristems, floral development, the breaking of bud dormancy, and seed germination.

    pdf26p anhphuonggl 11-04-2013 62 7   Download

  • The Animal Production and Health Section of the Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture recognises that the trend towards intensification of livestock production in developing countries presents both opportunities and challenges. The potential opportunities are the flow-on benefits to the producers and local economy while the potential challenges are the flow-on costs to the environment, animal health and welfare.

    pdf252p cronus75 14-01-2013 36 5   Download

  • After studying this chapter you will be able to understand: Mutualistic relationships between plant roots and the bacteria and fungi that grow in the rhizosphere help plants acquire important nutrients; nonmutualistic nutritional adaptations enable plant survival in adverse habitats.

    ppt14p nomoney10 04-05-2017 22 3   Download

  • Sugars play important roles as both nutrients and regulatory molecules throughout plant life. Sugar metabolism and signalling function in an intri-cate network with numerous hormones and reactive oxygen species (ROS) production, signalling and scavenging systems.

    pdf16p mobifone23 21-01-2013 38 2   Download

  • After studying this chapter you will be able to understand: The role of passive transport, active transport, and cotransport in plant transport; the role of diffusion, active transport, and bulk flow in the movement of water and nutrients in plants; how the transpiration cohesion-tension mechanism explain water movement in plants; how pressure flow explains translocation.

    ppt24p nomoney10 04-05-2017 21 2   Download

CHỦ ĐỀ BẠN MUỐN TÌM

ADSENSE

p_strKeyword=Plant nutrient
p_strCode=plantnutrient

nocache searchPhinxDoc

 

Đồng bộ tài khoản
2=>2