"Migration of salts in hydromorphic soils with the improvement of furrow irrigation technologies"

Authors

  • Yulia SHIROKOVA, Gauharay PALUASHOVA

Abstract

On saline hydromorphic, lands with zero slop in the lower reaches of the Amu Darya River (in the Khorezm region of Uzbekistan), water-saving modifications of furrow irrigation technologies were studied. Studies have established quantitative indicators of the effectiveness of «counter irrigation” and “irrigation through the furrow” when irrigating cotton. Water savings can reach: 15-25 %, with "counter irrigation", and 30 - 35 % with “irrigation through the furrow”. Also with "oncoming irrigation", the moisture content of the upper soil layer was improved at the end of the field (on 1.8 % of the soil mass).

The beneficial effect of counter irrigation on the salt regime of the soil in the lower part of the field was revealed. With a high degree of salinization of soils before irrigation (7-10 dS/m), with «counter-irrigation” the accumulation of salts by the end of the growing season was 6.2 dS/m less than in the control variation. Due to this, on average, a cotton yield increase of 0.77 t/ha was obtained for the field. When irrigating lightly saline soils (3 dS/m) through the furrow, a slight increase in seasonal salt accumulation (0.7 dS/m) and a decrease in yield by 0.12 t/ha were noted. The study proofed the need to select irrigation technologies that provide downward flow of water during irrigation of crops on saline hydromorphic soils.

Published

2020-11-01

Issue

Section

Articles