Influence of Spring Provision of Productive Moisture in Soil and Precipitation on Cereal’s Crop Productivity in Arid Black Earth Steppe Influence of Spring Provision of Productive Moisture in Soil and Precipitation on Cereal’s Crop Productivity in Arid Black Earth Steppe Authors: Kurdiukov Y. F., Vasilieva M. Y., Pryakhina S. I. Analysis of many years’ data lets to determine correlation of the cereal’s crop capacity with spring provision of productive moisture in soil and the precipitations quantity in different periods of the cereal’s growth and development.