Soil bulk density and phytosanitary conditions at potato field
Kokkuvõte
The aim of this paper is to present the microorganisms and
their activities and soil bulk density. It is a fact that both have a great
impact on soil fertility and its health status. Among the microorganisms in
soil, the bacteria and fungi are the most important ones for potato
cultivation; the bacteria living on the plant roots serve to uphold the
nutrient intake of plants. Our previous research has shown that
Paenibacillus Polymyxa Rizobacter fostered a better uptake of phosphorus
and reduced drought stress. The potato experiments were conducted in a
pH range of 5.4 to 5.9, so it was environmentally favourable for the
development of soil fungi. It is well known that moulds have a welldeveloped
filiform and a high spore production. We have found that if the
genus Alternaria, Helminthosporium, Fusarium, etc., has been left on the
surface of the skin of potatoes then it will affect the disease. In 2010, the
mould count remained within the range from 0.83·105 to 2.25·105. Also
according to our assessments, an economic loss related to unfavourable
soil bulk density for potato will occur if it is more than 1.25 ±0.07 Mg m-3.
At the same time, it should be noted that for the Estonian soil conditions,
the accepted limit of penetration resistance is 1.0 MPa.