Balance of humus and nutrients in the meadow-chernozem soil of the rice ecosystem

¹ Kuban State Agrarian University named after I.T. Trubilin, 13 Kalinina St., Krasnodar, 350044, Russian Federation
² Federal Scientific Rice Centre, 3 Belozerny, Krasnodar, 350921, Russian Federation
³ Maykop State Technological University, 191 Pervomayskaya St., Maykop, 385000, the Republic of Adygea, Russian Federation

^* Corresponding author: ashad.sheudzhen@mail.ru

Abstract

The purpose of the study is to determine the influence of mineral and organomineral fertilizer systems on the balance of humus and nutrients in meadow-chernozem soil of the rice ecosystem. The field test was conducted at the Maryano-Cheburgolsky irrigation massif of the Kuban-type rice irrigation system, which studied the effect of mineral fertilizers and their combination with manure slurry introduced in different periods (autumn and spring) and in different ways (with and without the nitrification inhibitor Entec FL). It was established that the optimization of mineral nutrition of plants is accompanied by an increase in rice yield by 2.32–2.78 t/ha and an increase in the removal of nutrients from the soil with harvest. The deficit-free balance of humus and food elements in meadow-chernozem soil under rice is ensured by using an organomineral fertilizer system with slurry application rate of 30 t/ha and N₁₂₀P₈₀K₆₀ mineral fertilizers. The combined action of mineral and organic fertilizers reduces the loss of humus from the soil by 2.9–3.0 t/ha and returns nitrogen 51.4–61.4 kg/ha (35.1–46.8%), phosphorus – 48.6–55.6 kg/ha (72.1–92.1%), potassium – 20.8–31.4 kg/ha (21.4–52.0%) taken with rice crop.