ASSESSMENT OF AGROPHYSICAL STATE THE OF SOIL AFTER SEEDBED PREPARATION BY SOIL PENETRATION RESISTANCE
Penetration resistance of dark gray podzolic soil and typical heavy-loamy chernozem was measured after traditional presowing tillage (by cultivator КТS 6 to a depth of 6-8 cm), presowing tillage by experimental tool in a production conditions and in a model microfield experiment with manually created optimum agrophysical parameters of seed layer. For dark gray podzolic soil the optimum parameters of penetration resistance during 2013-2014 was observed in all cases in a layer of 0-12 cm. In 2015 the optimal penetration resistance values were observed only in the layer of 0-5 cm. For typical heavy-loamy chernozem optimal values of penetration resistance is observed at depth of seedbed preparation in a layer of 0-8 cm. In the case of forming the optimal agrosoil parameters by presowing tillage its influence can be maintained throughout the growing season. Regression models allowing by results of penetration resistance and moisture determination with certain probability to establish its bulk density are proposed.