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In agricultural development one of the most certain increasers of productivity is the intensifying of fertilization. By the help of field and laboratory investigations, the nutrient condition of the cultivated field has been brought towards the correct balance in the best cases with regard to both the amounts of the different nutrients and the relation between them (7). In Finland we can already say that this is soin the case of the major nutrients in practical cultivation (8). From the point of view of the minor elements the situation is, on the contrary, still uncertain in many ways. A long »robbery» cultivation towards minor elements is a fact in agriculture nowadays. Besides this, the more intensive the cultivation is in other respects, the greater the »robbery» effect. The consequences are already to be seen in many places both in extensive and intensive plant husbandry, especially in sugar-beet cultivations and in gardens. The farmers are even overinterested in the minor element problem, and the blame for poor growth is often laid on the minor elements, although amelioration with lime or with the main nutrients has not been done. Investigations to solve the minor element problems of theFinnish soils are being carried out in many ways. From fertilizing experiments in field conditions, the deficiency of copper and boron, for example, has already been proved and on using the corresponding fertilizers big increases in yield have been obtained (5, 6,3). The amounts of minor elements in the soil have been investigated spectrographically (4, 10), but questions such as the solubility of the minor elements in Finnish soils and the need for or the poisonous qualities of the minor elements still require much investigation.

On the amounts of minor elements in Finnish soils