• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
The acrylamide problem: a plant and agronomic
The acrylamide problem: a plant and agronomic

... asparagine to accumulate include exposure to toxic metals such as cadmium, pathogen attack, and drought or salt stress (reviewed by Lea et al., 2007). Lack of nutrients other than nitrogen, such as potassium, sulphur, phosphorous, and magnesium, also causes asparagine to accumulate and this is exace ...
A conformationally restricted uniconazole analogue as a specific
A conformationally restricted uniconazole analogue as a specific

... ABSTRACT The plant growth retardant uniconazole (UNI), which has been used as an effective inhibitor of ent-kaurene oxidase (CYP701A) involved in gibberellin biosynthesis, also strongly inhibits ABA 8'-hydroxylase (CYP707A), a key enzyme in abscisic acid catabolism. Azole P450 inhibitors bind to th ...
Full text in PDF file - International Journal of Pharmaceutical
Full text in PDF file - International Journal of Pharmaceutical

... The leaves of Buchanania Lanzan (Anacardiaceae) are reported to have great medicinal value. Phytochemical screening including qualitative chemical examinations and quantitative analysis was carried out using HPTLC techniques. Identification, separation and quantification of chemical constituents was ...
FREE Sample Here - We can offer most test bank and
FREE Sample Here - We can offer most test bank and

... in food, must be obtained by the body’s nutritional intake, and are known as essential nutrients. _________________________ ANS: T TOP: Nutrients and Their Functions ...
Part I - Oregon State University Extension Service
Part I - Oregon State University Extension Service

... Removal of errant shoots help shape ...
Obligate cremnophytes are exiled to life on a cliff and... habitat where there is no (or limited) disturbance by larger... CHAPTER 5
Obligate cremnophytes are exiled to life on a cliff and... habitat where there is no (or limited) disturbance by larger... CHAPTER 5

... plants, the first seeds appeared some 360 million years ago. Since then they have developed into highly sophisticated propagules that enable seed plants to dominate the earth’s surface and conquer almost every possible habitat from the Antarctic to the hottest deserts.’ Seeds have a dual function, n ...
Catalog of Ecoseeds™ - Redwood City Seed Co.
Catalog of Ecoseeds™ - Redwood City Seed Co.

... edible without the need for grinding. Fun for kids to grown, plant as you would sweet corn, and allow the ears to dry before harvesting. Plant away from other corns to avoid cross pollination. PKT. $2 ...
Guide to Minerals and Trace Minerals
Guide to Minerals and Trace Minerals

... farming methods, re-fertilization with organic matter, crop rotation, etc.) to maintain optimal soil quality have been abandoned by large commercial farming ventures in favor of convenient and less costly methods to grow the largest crop possible—year after year with no respite. That means that ever ...
Bean Research
Bean Research

... your community has a large Italian population or fosters farmer’s type markets. Cranberry beans are usually found in the mass market as packaged and dried unless one encounters them in the independent local farmer’s market wherein they can be seen fresh with their beautiful coloration. More widely k ...
An Introduction - Indian Institute of Maize Research
An Introduction - Indian Institute of Maize Research

... seedling establishes sufficient leaf area to become autotrophy. The germ is the source of maize “vegetable oil” (total oil content of maize grain is 4% by weight). The endosperm occupies about two thirds of a maize kernel’s volume and accounts for approximately 86% of its dry weight. The endosperm o ...
Dietary Phosphorus, Blood Pressure, and Incidence of Hypertension
Dietary Phosphorus, Blood Pressure, and Incidence of Hypertension

... Key Words: phosphorus 䡲 cohort 䡲 dairy product 䡲 epidemiology 䡲 blood pressure 䡲 hypertension ...
- Malaysian Society of Plant Physiology
- Malaysian Society of Plant Physiology

... of metals in plant body. It is proposed that MCS is a novel chelator in plants and may play not merely Mg-dechelation from chlorophyllide a, but also other roles such as micronutrient transport. Keywords: Chlorophyll degradation, Mg-dechelation, Metal-chelating substance, Micronutrient transport, Ph ...
Main Packet - Canola in the Classroom
Main Packet - Canola in the Classroom

... currently available in the Great Plains region that have been developed for seeding in the fall and harvesting the following spring/summer. Roundup Ready winter canola varieties contain in-plant tolerance to Roundup agricultural herbicides, enabling growers to apply Roundup agricultural herbicides o ...
Global Extent of Soil Degradation - Wageningen UR E
Global Extent of Soil Degradation - Wageningen UR E

... The displacement of soil material by water can have several negative consequences. The removal of part of the usually fertile topsoil reduces the productive capacity of the soil, while in extreme cases the rooting depth can become restricted for agricultural crops. Although measurements of erop yiel ...
Gas-Chromatography Mass-Spectrometry (GC
Gas-Chromatography Mass-Spectrometry (GC

... sugar alcohols, amino acids, organic acids and polyamines, resulting in fairly comprehensive coverage of the central pathways of primary metabolism [7]. Nevertheless, the use of this technique in algal studies is still relatively rare [4]. This is at least partly due to the complexity of establishin ...
Review Article - WebmedCentral.com
Review Article - WebmedCentral.com

... people in the developing world rely on phytomedicine for primary healthcare for man and livestock (Mccorkle C. M., 1996). However, despite the growing demand for phytotherapeutic agents, most medical and veterinary professionals still distrust the use of herbal medicines, due to the lack of scientif ...
A comprehensive review on Parnabeeja [Bryophyllum pinnatum
A comprehensive review on Parnabeeja [Bryophyllum pinnatum

... The leaf sections of were used as explants, the various plant hormones (TDZ, BAP, BAP & NAA) with different concentrations (2.5, 5.0, 10.0, 15.0, 20.0 µM) were used. TDZ 10 μM gave better results for shoot proliferation and elongation in both varieties. The regeneration frequency and number of shoot ...
In Vitro, Propagation of Strawberry (Fragaria × annanasa Duch
In Vitro, Propagation of Strawberry (Fragaria × annanasa Duch

... embryogenesis. Direct morphogenesis is the production of shoots from explants without passing through callus (unorganised tissue) phase while indirect morphogenesis refers to induction of shoots through callus phase. The culture in which an organised form of growth can be continuously obtained is re ...
Zaenab Aljassim thesis-6_1
Zaenab Aljassim thesis-6_1

... subunit vaccines failed to provide protection beyond what the BCG vaccine can provide. Streptomyces, phylogenetic relatives of the mycobacteria, have been suggested as heterologous systems to formulate new vaccines against Tuberculosis. The main research objective of this study is to establish a fun ...
Amino Acids, Proteins, and Enzymes
Amino Acids, Proteins, and Enzymes

... • deficiency can lead to weakened connective tissue, slow-healing wounds, and anemia. • is found in blueberries, citrus fruits, tomatoes, broccoli, red and green vegetables. ...
MAP - hortharyana.gov.in
MAP - hortharyana.gov.in

... and the or-ganizations is deeply acknowledged. The agro-techniques included in the publication are based on the reports furnished by the project organiza-tions. All other information relating to basic features of a particular me-dicinal plant is based on the published literature and formularies/ pha ...
THE INFLUENCE OF NUTRITIONAL PHOSPHATE DEPRIVATION ARABIDOPSIS THALIANA
THE INFLUENCE OF NUTRITIONAL PHOSPHATE DEPRIVATION ARABIDOPSIS THALIANA

... cultures by 2-dimensional gel electrophoresis. Mass spectrometry identified 18 different secreted proteins that were upregulated by at least 2-fold by –Pi Arabidopsis. They were predicted to function in Pi scavenging, cell wall and ROS metabolism, proteolysis, and pathogen responses. The relationshi ...
Common Name: Artemesia - Powis Castle Botanical name
Common Name: Artemesia - Powis Castle Botanical name

... Chili Pequin adapts to a wide variety of soil types and either moist or very dry conditions. It can grow in sand, loam, caliche, or limestone soils. Plants grown in the shade will be thin while those grown with a little sun exposure produce a thicker branching structure. Chile Pequin is an excellent ...
Niacin
Niacin

... There are mild and severe deficiencies that could occur. The mild deficiency symptoms include indigestion, fatigue, canker sores, vomiting, and depression. A severe deficiency is not very common in the US, but it is highly related to alcohol abuse. The severe deficiency is also known as pellagra. Sy ...
Alkaloids
Alkaloids

... These are based on reaction of alkaloidal bases with acids (Acid-Base titration). They include: Aqueous titration: This is carried by either: 1- Direct titration of the alcoholic solution of the alkaloidal residue with standard acid, or 2- Back titration by dissolving the residue in a known amount o ...
< 1 ... 26 27 28 29 30 31 32 33 34 ... 552 >

Plant nutrition



Plant nutrition is the study of the chemical elements and compounds that are necessary for plant growth, and also of their external supply and internal metabolism. In 1972, E. Epstein defined two criteria for an element to be essential for plant growth: in its absence the plant is unable to complete a normal life cycle; or that the element is part of some essential plant constituent or metabolite.This is in accordance with Liebig's law of the minimum. There are 14 essential plant nutrients. Carbon and oxygen are absorbed from the air, while other nutrients including water are typically obtained from the soil (exceptions include some parasitic or carnivorous plants).Plants must obtain the following mineral nutrients from the growing media: the primary macronutrients: nitrogen (N), phosphorus (P), potassium (K) the three secondary macronutrients: calcium (Ca), sulfur (S), magnesium (Mg) the micronutrients/trace minerals: boron (B), chlorine (Cl), manganese (Mn), iron (Fe), zinc (Zn), copper (Cu), molybdenum (Mo), nickel (Ni)The macronutrients are consumed in larger quantities and are present in plant tissue in quantities from 0.2% to 4.0% (on a dry matter weight basis). Micro nutrients are present in plant tissue in quantities measured in parts per million, ranging from 5 to 200 ppm, or less than 0.02% dry weight.Most soil conditions across the world can provide plants with adequate nutrition and do not require fertilizer for a complete life cycle. However, humans can artificially modify soil through the addition of fertilizer to promote vigorous growth and increase yield. The plants are able to obtain their required nutrients from the fertilizer added to the soil. A colloidal carbonaceous residue, known as humus, can serve as a nutrient reservoir. Even with adequate water and sunshine, nutrient deficiency can limit growth.Nutrient uptake from the soil is achieved by cation exchange, where root hairs pump hydrogen ions (H+) into the soil through proton pumps. These hydrogen ions displace cations attached to negatively charged soil particles so that the cations are available for uptake by the root.Plant nutrition is a difficult subject to understand completely, partly because of the variation between different plants and even between different species or individuals of a given clone. An element present at a low level may cause deficiency symptoms, while the same element at a higher level may cause toxicity. Further, deficiency of one element may present as symptoms of toxicity from another element. An abundance of one nutrient may cause a deficiency of another nutrient. For example, lower availability of a given nutrient such as SO42− can affect the uptake of another nutrient, such as NO3−. As another example, K+ uptake can be influenced by the amount of NH4+ available.The root, especially the root hair, is the most essential organ for the uptake of nutrients. The structure and architecture of the root can alter the rate of nutrient uptake. Nutrient ions are transported to the center of the root, the stele in order for the nutrients to reach the conducting tissues, xylem and phloem. The Casparian strip, a cell wall outside the stele but within the root, prevents passive flow of water and nutrients, helping to regulate the uptake of nutrients and water. Xylem moves water and inorganic molecules within the plant and phloem accounts for organic molecule transportation. Water potential plays a key role in a plants nutrient uptake. If the water potential is more negative within the plant than the surrounding soils, the nutrients will move from the region of higher solute concentration—in the soil—to the area of lower solute concentration: in the plant.There are three fundamental ways plants uptake nutrients through the root: simple diffusion, occurs when a nonpolar molecule, such as O2, CO2, and NH3 follows a concentration gradient, moving passively through the cell lipid bilayer membrane without the use of transport proteins. facilitated diffusion, is the rapid movement of solutes or ions following a concentration gradient, facilitated by transport proteins. Active transport, is the uptake by cells of ions or molecules against a concentration gradient; this requires an energy source, usually ATP, to power molecular pumps that move the ions or molecules through the membrane. Nutrients are moved inside a plant to where they are most needed. For example, a plant will try to supply more nutrients to its younger leaves than to its older ones. When nutrients are mobile, symptoms of any deficiency become apparent first on the older leaves. However, not all nutrients are equally mobile. Nitrogen, phosphorus, and potassium are mobile nutrients, while the others have varying degrees of mobility. When a less mobile nutrient is deficient, the younger leaves suffer because the nutrient does not move up to them but stays in the older leaves. This phenomenon is helpful in determining which nutrients a plant may be lacking.Many plants engage in symbiosis with microorganisms. Two important types of these relationship are with bacteria such as rhizobia, that carry out biological nitrogen fixation, in which atmospheric nitrogen (N2) is converted into ammonium (NH4); and with mycorrhizal fungi, which through their association with the plant roots help to create a larger effective root surface area. Both of these mutualistic relationships enhance nutrient uptake. Though nitrogen is plentiful in the Earth's atmosphere, relatively few plants harbor nitrogen fixing bacteria, so most plants rely on nitrogen compounds present in the soil to support their growth. These can be supplied by mineralization of soil organic matter or added plant residues, nitrogen fixing bacteria, animal waste, or through the application of fertilizers.Hydroponics, is a method for growing plants in a water-nutrient solution without the use of nutrient-rich soil. It allows researchers and home gardeners to grow their plants in a controlled environment. The most common solution, is the Hoagland solution, developed by D. R. Hoagland in 1933, the solution consists of all the essential nutrients in the correct proportions necessary for most plant growth. An aerator is used to prevent an anoxic event or hypoxia. Hypoxia can affect nutrient uptake of a plant because without oxygen present, respiration becomes inhibited within the root cells. The Nutrient film technique is a variation of hydroponic technique. The roots are not fully submerged, which allows for adequate aeration of the roots, while a ""film"" thin layer of nutrient rich water is pumped through the system to provide nutrients and water to the plant.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report