METHOD FOR DETERMINING THE IRRIGATION RATE FOR DRIP IRRIGATION OF AGRICULTURAL CROPS Russian patent published in 2023 - IPC A01G25/00 

FIELD: drip irrigation of crops.

SUBSTANCE: method consists in the instrumental determination of the density of the moistened soil layer, the lowest moisture capacity of the soaked soil layer, the content of clay particles in the soil and the calculation of the irrigation rate, the issuance of which ensures the formation of a zone of soil moisture. Together with soil characteristics, the influence of water supply intensity (dropper consumption) and pre-irrigation soil moisture on the irrigation rate is taken into account, the calculation of which is made according to the dependence: N_drip = 4.78·y_vol·h_mois³·(P_p·k_q·k_β)²·(ε_post-ε_pre) · β_mm where N_drip is the irrigation rate per one drip water outlet, l/drop; y_vol is the density of soil composition averaged over the depth of the moistened layer, t/m³; h_mois is the thickness (depth) of the moistened soil layer, m; P_p is the parameter characterizing the influence of soil characteristics on the geometrical parameters of the moisture contour: P_p = 0.5·[0.66+0.009·W_c+0.034·W_mm] where W_c is the average content of clay particles in the moistened soil layer, % of the mass of dry soil (% MDS); W_mm is the average value of the minimal moisture for the moistened soil layer, % MDS; k_q is the coefficient characterizing the effect of water supply intensity on the geometrical parameters of the humidity circuit: k_q =(Q_drop/2)^0.1Wc/Wmm, Q_drop is the consumption of drip water outlet, l/h; k_β is the coefficient characterizing the influence of pre-irrigation soil moisture on the geometric parameters of the moisture contour: k_β =(W_c/W_mm)0.4·(1-β_pre/β_mm)^0.1Wc/Wmm; β_pre is the average pre-irrigation soil moisture for the moistened soil layer, % MDS; β_mm is the soil moisture corresponding to the minimal moisture which is average in the moistened layer, % MDS, β_{mm =} W_mm; ε_post and ε_pre is the shares of β_mm indicating levels of post-irrigation and pre-irrigation soil moisture, respectively, measured in fractions of a unit.

EFFECT: dosed supply of irrigation water to the root-inhabited soil space.

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