Essential micro-(trace) elements

摘要: For nearly half a century following the classical researches with water cultures of Sachs and Knop in 1860 it was generally accepted that for vast majority plant species, if not all, ten elements, elements only, were essential healthy growth. The carbon, hydrogen, oxygen, nitrogen, phosphorus, sulphur, potassium, calcium, magnesium iron. few plants had been suggested some additional element might be necessary; thus as early 1862 Nobbe Siegert came to conclusion chlorine necessary development buckwheat (Fagopyrum esculentum). Again, nutrient solution proposed by Pfeffer contained certain amount (1900) stated probably no grown complete absence element. However, convincing confirmation these conclusions forthcoming any instance many years, opinion all growth almost without question.