The effect of cyclic irrigation on reproduction of black-earth soil fertility

Abstract

The relevance of the problem under study is conditioned by the need to preserve and reproduce the fertility of agricultural land. The goal of the research is to develop methods for maintaining and improving the fertility of irrigated black earth soil in southern Russia. Research methods: the leading method is the synthesis, comparison and analysis of data obtained from long-term field studies of the long period of irrigation (30 years or more)  effect  on the change in soil processes; the experiments were carried out by the randomized method on stationary closes in the experimental farms of the institute (Russian Scientific Research Institute of Land Improvement Problems, until 2001 it was called Southern Scientific Research Institute of Land Improvement Problems, Rostov Region); soil and water sampling and analysis was carried out according to international standards (ISO). The study results showed that the adoption of the proposed cyclic irrigation method, when one part of the crop rotation fields (5, 25, 50 or 75%) is put into non-irrigated mode with seeding-down of drought-resistant crops for several years, and the second part of the fields with moisture-loving crops remains in the irrigation mode. This alternation of fields in the experimental plots contributed to the creation of conditions for the natural restoration of the main indicators of soil fertility: the humus content increased from 1.99 to 2.67%, the pH decreased from 7.5 to 6.7, the amount of toxic salts is halved from 0.04 to 0.02% in the upper horizons 0-20 and 20-40 cm and the sodium content in the soil absorption complex decreased more than two to three times  and moved from the category of salty soils to non-salty. Practical significance is concluded in the development of a method for increasing soil fertility without additional costs for chemical reclamation of degraded soils on long-irrigated lands.

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