| 摘要 |
FIELD: agriculture.SUBSTANCE: method includes intermittent flooding of rice checks, water supply to rice crops is carried out in the form of asymmetrical triangular impulses regulated in space and time, reducing the bare soil moisture between the impulses is not allowed below 85% of the total water capacity (TWC), the program distribution of water in the irrigation network between the consumers is carried out on schedule by assigning time intervals of water supply to each of them on the parameters of the regulated impulse, which are determined by the following formulas: - The height of the impulse (water layer), h;h=?+?h, mm, where: ? is mean-square deviation of the roughness on the surface of checks, mm; ?h is a layer of water, ensuring flooding of high areas on the check and creating a favourable thermal regime of the soil, mm, it is assigned equal: in a phase of the "shoots-tillering" - 60 mm, in the phase of formation of the embryonic panicle - 100 mm; - The duration of the water supply to create a given impulse height, t: t=(h/q)·?, day, where: q is a hydromodule of flooding equal to 100 mm/day; ? is coefficient taking into account evaporation losses equal to about 1.05; - Duration of drawdown of the water layer in a natural way through evapotranspiration (E) and filtration (F) t: t=h/(E+F), day; - Duration of bare soil between impulses t:where : ? is humidity at which its water-keeping is close to 0, and the transpiration intensity is not reduced, for loamy soils it was found to be 85% TWC - The amount of strokes of water circulation N on the economic distributor is defined by the formula: N=T/twhere: Tis the total duration of the impulse, day.EFFECT: increased efficiency of use of water resources.1 cl, 4 tbl, 1 dwg |
