Agroecological Efficiency of Organic and Mineral Fertilizers under Frozen Soil Conditions

Abstract

Investigations were carried out on permafrost taiga soil in Central Yakutia in a field factorial experiment with a wide range of rates and combinations of cattle manure and mineral fertilizers. The advantage of an organo-mineral fertilizer system in N₆₀P₆₀K₆₀ rates was shown against a background of 40 t of manure per hectare, which provides, under watering conditions, potato tuber yields of 18 t per hectare with starch content of 13.9%, which is 47.8% higher than in the control without fertilizer use. The yield of potatoes under the organic system with annual manure rate of 40 t per hectare was at the same level with the mineral system, but tubers contained more starch, 12.8%. It has also been established that organo-mineral and organic systems have a positive effect on the agrochemical properties of the soil, optimize its humus state and phosphate and potassium regimes. For the mineral fertilizer systems in rates of N₆₀P₆₀K₆₀, the yield increment was significant, but it did not exceed 17.8% with a lower starch content in tubers, 11.5%, and a negative balance of humus, phosphorus, and potassium in the soil.