Abstract
SHS investigation development is considered from the geographical and historical viewpoint. 3 stages are described. Within Stage 1 the work was carried out in the Department of the Institute of Chemical Physics in Chernogolovka where the scientific discovery had been made. At Stage 2 the interest to SHS arose in different cities and towns of the former USSR. Within Stage 3 SHS entered the international scene. Now SHS processes and products are being studied in more than 50 countries.
Abstract
Soil acts as a source of nutrient elements, and the availability of nutrients is determined by soil properties. The different elements are grouped according to their biochemical behavior and physiological functions. The nutrients that are needed in moderately large amounts are called macronutrients. The plant macronutrients comprise nitrogen, potassium, phosphorus, calcium, sulfur, and magnesium. The micronutrients are required for plant growth in much smaller quantities than macronutrients. These micronutrients contain boron, copper, iron, manganese, molybdenum, and zinc. All of these nutrients are absorbed through the roots. Water will transfers the nutrients from soil to the roots of the plant. In this chapter, we will discuss the physiological role of essential and non-essential elements and the effects of some general environmental stressors, such as salinity, drought, and metals, on nutrient uptake by plants.
Keywords:
Deficiency symptoms, Drought, Essential elements, Heavy Metals, Macronutrients, Micronutrients, Salinity.
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Authors:Bentham Science Books