* Здесь и далее: Lim-диапазон колебаний показателей; M ± m-средняя арифметическая ± ошибка среднего значения; V-коэффициент вариации, %.

В современных условиях организации земледелия актуальны испытания кремнийсодержащих природных материалов, в том числе цеолитов, которые оказывают оструктуривающее и влагоудерживающее действие на почву, оптимизируют условия для развития агрономически цен-

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The paper presents the results of field and laboratory experiments in studying the effectiveness of zeolite of the Yushanskoye deposit based in the Ulyanovsk region being a fertilizer of maize on grain when applied both in pure form and in combination with mineral fertilizers. A positive effect of zeolite on the agrophysical, biological and agrochemical properties of medium-loamy leached chernozem and, as a result, yield and environmental safety of maize grain has been established. Its increase ranged from 0.93 t/ha (500 kg/ha of zeolite) to 2.43 and made up to 2.76 t/ha when used together with mineral fertilizers. when applying 500 kg/ha zeolite to the soil together with nitrogen fertilizer (urea) at the rate of 60 kg per hectare for 3 years on average the maize grain yield exceeded the option with mineral fertilizers (N60H60R60) by 0.27 t/ha. Zeolite contributed to more environmentally friendly products.