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characteristics of nutrient uptakethese results show certain characteristics of nutrient uptake selectivity certain mineral elements are taken up
changes in the ions the concentration of potassium phosphate and nitrate declined significantly in the bathing medium within four days the
nutrient absorptionexcept for carbon oxygen and hydrogen which are provided by co2 and water all the other elements essential for plants are provided
biochemical function - essential elementselements mg mn k ca and fe are cofactors for many enzymatic reactions fe is carrier of electrons in electron
structural function - essential elementsthe elements nitrogen phosphorus and sulphur absorbed from the soil are essential components of amino acids
osmotic function - essential elementsplant cells generally contain mineral ions 10 to 1000 times higher in concentration than the surrounding soil
criteria of essentialityamon and stout as early as 1939 suggested certain criteria that an element must fulfil in order to be classified as essential
nutrient elements of plantslet us first find out the chemical composition of plants and see which element nature has selected to support their
normal 0 false false false en-in x-none x-none
distribution of stomatathere are two parameters normally used for expressing the distribution of stomata stomatal frequency the number of stomata per
alteration of turgor of guard cellsthere are two ways in which the relative turgor of guard cells may be altered a decrease in osmotic potential or
factors controlling stomatal aperturekhul ja sim sim the two rocks slide and the gates to a great treasure open with these magic words ali baba and
mechanism of stomatal openingit has been known for over a century that stomata open because of reversible turgor changes in the guard cells stomata
stomatal resistancestomatal resistance is most important because gas exchange between leaves and external atmosphere takes place entirely through
functions of stomatathe cuticle forms outermost surface of the leaf and offers resistance to the evaporation of water vapour and entry of carbon
water loss - plant water relationplants lose about 98 of water to the atmosphere by transpiration often water loss by transpiration exceeds gain by
water absorption and transpirationthe rate of water absorption is controlled by the rate of transpiration a high water potential in the atmosphere
root - plant water relationroot system is directly related to the absorption of water and its growth under field conditions is very much influenced
soil temperaturesoil temperature is known to influence water absorption and ultimately transpiration to a considerable extent in many plants water
permanent wilting percentage pwpit is the percentage of moisture in the soil at which a plant wilts and does not recover unless water is added to the
field capacity fcit is the capacity of a field to hold the amount of water against gravitational forces it is expressed as the percentage of the dry
water absorptionwater status of a plant is determined by two major factors i water absorption and ii water loss we deal with water absorption in this
physical concepts of plant water relation - osmosisosmosis is a special case of diffusion here the movement of water solvent takes place from a
physical concepts of plant water relation - diffusiondiffusion is a spontaneous process that leads to net movement of a substance from a region of
basic physical concepts of plant water relationthe main idea of this section is to explain the concept of chemical potential of water or water