REGULATION OF THE HYDROTHERMAL REGIME OF EARLY POTATO PLANTINGS

Abstract

The article deals within matters of the mineral elements removal with drainage water on reclaimed lands, on the Central Russian and Volga Uplands in an unstable hydrothermal regime. The reuse of drainage water for irrigation with the use of sprinkler and drip irrigation are assessed. Taking the example of drip irrigation is being considered the possibility of the most effective influence during the plant growing season on the hydrothermal regime of the soil and the ground-level pollution both in a dry year and in case of excessive rainfall. The features of drip irrigation technology with use of a mulching screen made of a membrane film with selective moisture permeability are described. The proposed method of drip irrigation of early varieties of potatoes due to more intensive condensation of water vapor on the inner layer of the screen allows to maintain a more stable daily soil temperature. The screen opaqueness inhibits the germination of weeds in wet row spacing, capillary humidification of the tuber formation zone in combination with the screen permeability for air prevent anaerobic processes in this part of the furrows and its overmoisturazing. The application of the proposed method of potato cultivation during drip irrigation provides the rational use of rainfall, increasing the uniformity of field moistening and reducing moisture loss, and also prevents the soil overwetting in the zone of tuber formation and provides aeration of the soil under the screen.