• 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
vascular cambium
vascular cambium

... – A waxy coating called the cuticle helps prevent water loss from the epidermis – In woody plants, protective tissues called periderm replace the epidermis in older regions of stems and roots ...
Cotton production guideline
Cotton production guideline

... (China, India, USA and Pakistan) is, however, expected to increase by 3% in 2014/15. In contrast, the ICAC expects cotton production to decrease by 18% in the Southern Hemisphere in 2014/15. In Brazil and Australia, the Southern Hemisphere’s largest cotton-producing countries, production is forecast ...
Hevea 1
Hevea 1

... ARREANGEMENT (FIG 3.3B) WHEN ESTABLISHING POLYBAG ROOTSIOCK NURSERIES Planting in polybags: As soon as seeds germinate in the germination bed, plant one germinated seed per bag. After 7 days remove weak or diseased seedlings and replace with fresh germinated seeds. Watering : Watering should be done ...
Sexual Reproduction in Seedless Plants
Sexual Reproduction in Seedless Plants

... as descriptive as possible about the plant’s general appearance and where it lives. ...
Dof5.6/HCA2, a Dof Transcription Factor Gene, Regulates
Dof5.6/HCA2, a Dof Transcription Factor Gene, Regulates

... preferentially expressed in the vasculature of all the organs, particularly in the cambium, phloem, and interfascicular parenchyma cells of inflorescence stems. Dominant-negative analysis further demonstrated that both ubiquitous and in situ repression of HCA2 activity led to disruption of interfasc ...
Plant Guide 2012 - LeBeau Bamboo Nursery
Plant Guide 2012 - LeBeau Bamboo Nursery

... Bamboo grows differently than most other woody plants, mostly because bamboos are basically giant grasses. Each cane is connected to all the other canes in the grove through an underground network of rhizomes, keeping an entire grove a single organism. This is what allows bamboo plants to grow so qu ...
Comparative pharmacognosy of Pashanbhed
Comparative pharmacognosy of Pashanbhed

... activity by binding with adenosine A1 receptor associated with the diuretic action.[23] Many reports have extensively shown that terpenoids exert significant cardiovascular effects.[24-26] It has also been reported that some classes of diterpenes showed significant systemic hypotensive and coronary ...
2.3. 3. The definition of medicinal plants.
2.3. 3. The definition of medicinal plants.

... herbalists. They copied old books, thus preserving the compiled knowledge of bygone ages. Charlemagne ordained that each monastery should have a garden of medicinal herbs. The abbess Hildegard of Bingen (10981179) was also a Benedictine herbalist. Her book Causae et Curae is a compilation of the kno ...
Increased Lysine Synthesis Coupled with a Knockout of
Increased Lysine Synthesis Coupled with a Knockout of

... We also analyzed the specific correlation between Lys and Thr or Met in each plant individually. As shown in Figure 7, in all comparisons the individual lines again were clustered into groups 1 and 2, similar to those shown in Figure 5. The relative level of free Thr was negatively correlated with t ...
ACID/ALKALINE BALANCE
ACID/ALKALINE BALANCE

... white blood cells in the blood of a normal adult human.) The main adverse effects of chronic metabolic acidosis are increased muscle degradation and abnormal bone metabolism, as well as indirect effects on these tissues emanating from alterations in the secretion and/or action of several hormones. T ...
native plant list - Portland Water District
native plant list - Portland Water District

... Redosier Dogwood (Cornus sericea) Grows from 6 to 9 feet high with a spread of 8 to 12 feet. Grows best in rich medium to wet soil. Typically found in bogs or swamps and will tolerate a wide range of soils. Young branches are bright red. Small white clusters of flowers bloom in late spring and are ...
Biochar in Agricultural Systems
Biochar in Agricultural Systems

... from manure; therefore, it has the potential of being land-applied with lower nutrient runoff problems. The biochar is also much lighter than the manure it was produced from, and if it is then seen as a value-added product, it will make long-distance transport and use out of areas of animal producti ...
Allelopathic  Effect of  Acacia Raddiana Leaf Extract on... Lupinus termis
Allelopathic Effect of Acacia Raddiana Leaf Extract on... Lupinus termis

... been attributed to inhibited of enzymes of biosynthesis of Guinolizidine alkaloids. In this respect, Takamatsu et al.,[4 7 ], indicated that certain members of the genus lupinus are rich in esters of bicyclic quinolizidine alkaloids with the derivatives of cinnamic acid. Also, Takamatsu et al., [4 7 ...
Lesson 10 - eXtension
Lesson 10 - eXtension

... secretes about 1/3 of a pound of protein in the form of enzymes and other proteins into the digestive tract. Secreted enzymes break down the feed, and then amino acids (the building blocks for protein), carbohydrates (sugars for energy), and fats (for energy and essential fatty acids) are taken up ( ...
(G6PD) Deficiency
(G6PD) Deficiency

... haemolytic potential Currently available medications with proven haemolytic potential are relatively few in ...
St John`s wort, Hypericum perforatum, best practice management
St John`s wort, Hypericum perforatum, best practice management

... from seed or by suckering. It mainly sets seed without pollination, but can also outcross. New crowns may be produced by shoots from the lateral roots in spring and autumn. The origin of a mature crown can be determined by digging up the roots. If the main tap root is vertical the plant originates f ...
Peas in the Home Garden
Peas in the Home Garden

... year’s growth from fruit trees inserted into the soil make an excellent, cheap, and somewhat artistic fence. The brush is usually good for two to three years. One- and two-inch chicken wire will also suffice. Unlike beans, peas aren’t a heavy plant or fruit, thus they don’t need as strong a fence. I ...
Hydrangeas - Cornell Cooperative Extension
Hydrangeas - Cornell Cooperative Extension

... This commonly grown hydrangea has large globe-shaped flowers. It is frequently forced by florists and sold as an indoor plant in spring. Once moved outdoors (if hardy), flower color depends on the soil pH where it is grown: blue if acid; pink if alkaline. Most Rockland County soils are acidic. If yo ...
Phytochemical analysis and medicinal uses of Hibiscus sabdariffa.
Phytochemical analysis and medicinal uses of Hibiscus sabdariffa.

... taken as juice which helps in the improvement of health and immune system thus in the prevention of diseases in a research carried out by [3] in Nigeria. In folk medicine, it has been used to treat cancer, inflammatory diseases and research has shown that the flowers contains anthocyannins, flavonoi ...
ACTA BIOLOGICA CRACOVIENSIA SERIES BOTANICA Vol. 51
ACTA BIOLOGICA CRACOVIENSIA SERIES BOTANICA Vol. 51

... prototype of therapeutic hepatitis B vaccine and a carrier for HBV preS epitopes P. M. Pukacki, M. Jarząbek, W. Jóźwiak, C. Lütz – Cryoprotective activity of thermal hysteresis protein in evergreen plants D. Raj, A. Kokotkiewicz , M. Łuczkiewicz – Influence of different culture strategies on growth ...
Somatic embryogenesis from leaf explants
Somatic embryogenesis from leaf explants

... Induction of callus tissue On CIM plant explants formed soft and very friable callus, white to yellowish in the case of foliole explants and more yellow to light green from the petioles. For the period of 50 – 60 days 80 % of the explants formed callus tissue. The formation of calli started 15 days ...
Nonphosphorylating Glyceraldehyde-3-Phosphate
Nonphosphorylating Glyceraldehyde-3-Phosphate

... basic protein (MBP), which was phosphorylated to a certain degree under all the assays conditions (Fig. 1A). Interestingly, Figure 1B illustrates that np-Ga3PDHase was appreciably phosphorylated only under conditions specific for SnRK, Ca2+-independent protein kinases. Results thus support a high sp ...
Transcriptome analysis reveals unique C4
Transcriptome analysis reveals unique C4

... carotenoids de novo, therefore, they rely upon diet to obtain these compounds. ArA can be commercially obtained from marine fish oil, animal tissues and fungi [8]. Interest in ArA and other long-chain PUFAs inspired the search for new PUFA sources. Myrmecia incisa Reisigl H4301, a coccoid green micr ...
on the potential efficiency of converting solar radiation to phytoenergy
on the potential efficiency of converting solar radiation to phytoenergy

... Because photosynthesis is a quantum process, the distinction between solar energy flux (irradiance) and photon flux density is important; photon energy is inversely related to wavelength, so that the potential efficiency of energy use is greater with longer wavelength photons. The maximal spectral s ...
Taxonomy and biology of the tropical plant Jatropha curcas L.
Taxonomy and biology of the tropical plant Jatropha curcas L.

... Effect on soil erosion ► Propagation by seedlings ...
< 1 ... 32 33 34 35 36 37 38 39 40 ... 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