Assessment of acid state of low-productive irrigated lands depending on fertilizer system and preceding crops
2020
Shevchenko, V., All-Russian Research Inst. of Hydrotechnics and Melioration named after A.N. Kostyakova, Moscow (Russian Federation) | Bondareva, G., All-Russian Research Inst. of Hydrotechnics and Melioration named after A.N. Kostyakova, Moscow (Russian Federation) | Solovyov, A., All-Russian Research Inst. of Hydrotechnics and Melioration named after A.N. Kostyakova, Moscow (Russian Federation) | Kudryavtseva, L., All-Russian Research Inst. of Hydrotechnics and Melioration named after A.N. Kostyakova, Moscow (Russian Federation)
The mineral system of cultivating spring barley on degraded lands exacerbates the acidity of the soil solution, increasing it by an average of 0.2−0.3 pH for all preceding crops. To neutralize the acidity of physiologically acidic fertilizers, it is necessary to apply higher doses of lime, taking into account correction coefficients. The application of organic fertilizers in the form of manure extracted from the liquid effluents of animal husbandry complexes, combined with the use of spring rapeseed as a preceding crop, is essential in reducing soil acidity. In this case, over a seven-year research period, the acidity reduction of unproductive irrigated lands amounted to 0.42−0.48 pH at LSD05 = 0.41−0.45 pH. For other predecessors, there was only a positive trend of deoxidation of the soil, since the difference between the initial and final values was within the error of experience. The positive effect of liquid livestock runoff on soil deoxidation was noted, which provided a significant reduction in acidity when applying 100−120 t•haE−1 as the main fertilizer, equal to 0.40 pH units.
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