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Impulse irrigation efficiency of rice under conditions of irrigation water shortage

Purpose: research of impulse irrigation of rice in different interphase periods for saving water resources. Materials and methods. The research was carried out at different water supply impulses to rice during the growing season. Observations, metering, field measurements were carried out according to technique of Kuban State Agrarian University and the Federal Scientific Rice Center. The irrigation regime in the control variant corresponded to the technology of shortened flooding. In the experimental variants, the impulses “watering – draining” were carried out in the phases of rice vegetation “germination – tillering”, “booting – flowering”, “ripening”. Results. It has been found that the impulse irrigation regime in the phases “germination – tillering”, “booting – flowering” and “ripening” can reduce the irrigation rate by 11.4; 5.1; 1.5 %, respectively, compared to control. The average yield by experience was 75.7 dt/ha, which is more than on control by 1.2 dt/ha. The calculation of economic efficiency by the options showed that the extra profit from the yield increase in the experimental plots was from 1440 to 2880 rubles/ha, the net income rose from 480 to 960 rubles/ha. Cost savings on water delivery service payment varied according to the experimental options from 69.83 to 530.71 rubles/ha. Conclusions. Impulse irrigation at different interphase periods of rice growing with soil moisture at the end of each pulse of at least 85 % of the lowest moisture capacity does not affect grain yield adversely. In the control variant of the experiment, the rice yield was 74.5 dt/ha, on impulse irrigation in the “germination – tillering” phase – 7.61 dt/ha, “booting – flowering” – 75.6 dt/ha, “ripening” – 75.3 dt/ha. In general, the cost savings were from 549.83 to 1490.71 rubles/ha when introducing an impulse irrigation regime for rice in various interphase periods in the experiment.