METHOD OF FORECASTING YIELDING CAPACITY OF LUCERNE SEEDS ON CULTIVATION IN IRRIGATED AGRICULTURE

摘要

FIELD: agriculture, in particular, forecasting and improvement of intensive technology used in cultivation of winter cereals under arid climate conditions.;SUBSTANCE: method involves providing deep plowing combined with application of phosphate-potassium fertilizer and soil herbicides; harrowing in spring; sowing crop by wide drilling method and irrigating during budding phase with single soil moistening procedure to soil moisture content of 90-100% of minimal moisture capacity up to 1.3-1.5 m depth at the rate of 1,360-1,500 m³/hectare; upon termination of flowering stage, reducing moisture content in soil layer of 0-55 cm to 50-55%, in soil layer of 51-100 cm to moisture content of 70-75%, in soil layer of 101-150 cm to moisture content of 75-80% of minimal moisture capacity; determining average daily soil temperature in last decade of April and first decade of May; defining seed yielding capacity at second year of plant life from expression: Y=k₁·xt+(k₂·A+k₃·d+k₄·P)/G_s, where Y is Lucerne seed yielding capacity to be forecast during second year of plant life, kg/hectare; xt is average soil temperature at the last decade of April - first decade of May, C; A is seed sowing rate, pc/hectare; d is amount of NPK fertilizers, kg/hectare; P is irrigation norm for growing period, m₃/hectare; k₁ is coefficient taking into account sort qualities of each seed of Lucerne in formation and accumulation of cereal mass, kg/( C · hectare); k₂ is coefficient taking into account influence of temperature mode upon formation of plant root system during the first year of life, kg/(pc · hectare); k₃ is coefficient taking into account mineral feeding stock from precursor in root layer, kg(kg hectare); k₄ is coefficient taking into account share of natural precipitation in formation of cereal yield, kg/mm · hectare); G_s is hydrotechnical coefficient TG based on data referring to precipitation and total of temperatures above +10 C during plant life from time of beginning sowing procedure to growing termination time.;EFFECT: reduced labor intensity and simplified method of forecasting Lucerne seed yielding capacity, increased precision in calculations and reliable forecasting results.;6 ex