Plant nutrition

Xem 1-20 trên 109 kết quả Plant nutrition
  • “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 31 13   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.

    pdf663p augi20 24-04-2012 89 45   Download

  • Chapter 37 - Soil and plant nutrition. This chapter define soil texture and soil composition; explain why plants cannot extract all of the water in soil; define cation exchange and describe how plants can stimulate the process; discuss the problems of topsoil erosion and farm irrigation in arid regions; suggest actions that can help mitigate these problems;...

    ppt61p tangtuy02 08-03-2016 4 1   Download

  • Plant response to reduced water availability and other abiotic stress (e.g. metals) have been analysed through changes in water absorption and transport mechanisms and also by molecular and genetic approach. A relatively new aspects of fruit nutrition are presented in order to provide the basis for the improvement of some fruit quality traits. The involvement of hormones, nutritional and proteomic plant profiles together with some structure/function of sexual components have also been addressed.

    pdf398p conquynho32 14-09-2012 66 26   Download

  • Section II Essential Elements––Macronutrients 2 Nitrogen Discovery of the essentiality of nitrogen is often credited to de Saussure (1–3), who in 1804 recognized that nitrogen was a vital constituent of plants, and that nitrogen was obtained mainly from the soil.

    pdf32p trasua1 21-09-2010 70 21   Download

  • 3 Phosphorus Incidental phosphorus fertilization in the form of manures, plant and animal biomass, and other natural materials, such as bones, probably has been practiced since agriculture began. Although specific nutritional benefits were unknown

    pdf40p trasua1 21-09-2010 71 18   Download

  • 9 Chlorine Chlorine is classified as a micronutrient, but it is often taken up by plants at levels comparable to a macronutrient. Supplies of chlorine in nature are often plentiful, and obvious symptoms of deficiency are seldom observed.

    pdf14p trasua1 21-09-2010 65 16   Download

  • 16 Aluminum Soils contain an average of 7% total aluminum (Al), and under acidic conditions, aluminum is solubilized (1), increasing availability to plants and aquatic animals. Soil acidification due to application of fertilizers, growing of legumes.

    pdf62p trasua1 21-09-2010 60 14   Download

  • 7 Sulfur Sulfur (S) is unique in having changed within just a few years, from being viewed as an undesired pollutant to being seen as a major nutrient limiting plant production in Western Europe. In East Asia, where, under current legislative restrictions

    pdf56p trasua1 21-09-2010 46 13   Download

  • 12 Manganese The determination of manganese (Mn) essentiality in plant growth by McHargue (1914–1922) focused the attention of plant nutritionists on this nutrient, and led the way for further groundbreaking studies.

    pdf24p trasua1 21-09-2010 68 13   Download

  • 15 Zinc Discovery of zinc as an essential element for higher plants was made by Sommer and Lipman (1) while working with barley (Hordeum vulgare L.) and sunflower (Helianthus annuus L.). However, Chandler et al. (2) stated that Raulin, as early as 1869.

    pdf26p trasua1 21-09-2010 55 13   Download

  • 5 Calcium The rare earth element calcium is one of the most abundant elements in the lithosphere; it is readily available in most soils; and it is a macronutrient for plants, yet it is actively excluded from plant cytoplasm.

    pdf24p trasua1 21-09-2010 65 12   Download

  • 8 Boron Boron (B) is one of the eight essential micronutrients, also called trace elements, required for the normal growth of most plants. It is the only nonmetal among the plant micronutrients. Boron was first recognized as an essential element for plants early in the twentieth century

    pdf41p trasua1 21-09-2010 50 12   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 45 12   Download

  • 17 Cobalt Cobalt has long been known to be a micronutrient for animals, including human beings, where it is a constituent of vitamin B12 (1). However, its presence and function has not been recorded to the same extent in higher plants as in animals.

    pdf16p trasua1 21-09-2010 76 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 52 12   Download

  • Early interest in selenium by nutritionists concerned its high concentration in certain range plants and the consequent toxicosis in animals that grazed those plants. More recently, the essential nature of selenium has become the center of attention, and this element is now known to be required by laboratory animals, food animals (including fish), and humans. Its role as an integral feature of glutathione peroxidase has been established, and other possible functions are under active investigation.

    pdf185p cronus75 14-01-2013 31 9   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 53 9   Download

  • A ‘textbook’ plant typically comprises about 85% water and 13.5% carbohy- drates. The remaining fraction contains at least 14 mineral elements, without which plants would be unable to complete their life cycles. These essential mineral elements include six macronutrients – N, K, P, S, Mg and Ca – which are present in relatively large amounts in plant tissues (mg g−1 of dry tissue), and several micronutrients, including Fe and Zn, which are present in smaller amounts (µg g−1 of dry tissue).

    pdf344p banhkem0908 24-11-2012 34 8   Download

  • Plants are sessile organisms and as such must have mechanisms to deal with both abiotic and biotic stresses to ensure survival. The term “abiotic stress” includes many stresses caused by environmental conditions such as drought, salinity, UV and extreme temperatures. Due to global climate change it is predicted that abiotic stresses will increase in the near future and have substantial impacts on crop yields (Intergovernmental Panel of Climate Change;

    pdf397p thienbinh1311 13-12-2012 30 8   Download


Đồng bộ tài khoản