The optimization of the water regime of chernozem of ordinary forest-steppe zone of Krasnoyarsk region

The aim of the study is to optimize the water regime of ordinary medium-loam Chernozem when growing perennial grass mixtures for the year of the calculated provision of precipitation. The study was conducted on the territory of the hospital "Novoselovo", located in the forest-steppe zone in the province of varieties of ordinary chernozems of medium-loamy Chulym-Enisei southern district, formed on loess-like loams of quaternary deposits. To study the irrigation regime of ordinary Chernozem, vegetation and field experiments were laid, according to the scheme. The scheme of experiment in studying the water regime of ordinary chernozem: 1) control (without irrigation); 2) pre-watering threshold moisture 80 % HB. The repetition of the experience was fourfold. The samples were taken by Kachinsky drill after 10 cm to a depth of 50 cm; the humidity was determined by thermostatic-weight method a decade, also before and after watering. The moisture content of growing season in the year of the research was characterized as insufficiently humidified. The observations of soil moisture dynamics showed that precipitation had not provided optimal plant moisture, especially at the beginning of grass regrowth. To maintain humidity at the level of 80-100 % HB, in May, two watering norms ~ 300 m3 / hectare on the variant with irrigation were carried out. Water consumption rates for irrigation were almost twice as high as for bogar.