Nutricion Vegetal

Plant Nutrition
Photosynthesis is the major source of plant nutrition. Plants also require a number of inorganic molecules. macronutrients carbon, hydrogen, oxygen, nitrogen, potassium, calcium,phosphorus, magnesium and sulfur each may exceed 1% dry weight of plant micronutrients iron, chlorine, copper, manganese, zinc, molybdenum, and boron constitute from less than one, to several hundred,parts per million in most plants nutritional requirements assessed in hydroponic cultures

Deficiencies of certain nutrients cause specific diseases Complete lack of only one nutrient can result inlack of growth Leybig’s Law of the Minimum although all other nutrients are in abundance, a deficiency of a single nutrient will stop growth

Under natural circumstances, nutrients come from soilPlant growth affected by soil composition Most roots found in topsoil Topsoil consists of small particles of weathered rock, minerals, decomposing organic materials (humus), and living organisms Abouthalf total soil volume occupied by spaces or pores filled with air or water, depending on environmental conditions

weathering of bedrock releases nutrients slowly - chemical processes makemineral nutrients soluble In natural conditions, plants remove nutrients from the soil but their death and decomposition returns nutrients to the soil

In agriculture, removal of the crop removesnutrients that the crops have taken from the soil Agricultural land often becomes nutrient depleted Chemical fertilizers can be used to replenish lost nutrients Commercial fertilizers generally have Nitrogen(N), Phosphorus (P), and Potassium (K) in percentages given on the label: 20:20:20 = 20% N: 20% P: 20% K They often have other macronutrients and micronutrients also. Nutrient depletion in soils canbe reduced by crop rotation and plowing under of unharvested plant remains.

Large particle soils have large air spaces and little surface area They have poor ability to hold water and nutrients...