Annual dynamics of ammonium and nitrate nitrogen content by using capsulated carbamide in cassettes of one-year-old seedlings of Scots Pine (Pinus sylvestris)

Abstract

Over the past decades of forestry development in Russia, the main trends have been identified, according to which P. sylvestris planting material can be effectively grown in a container method with a closed root system, considering the forest-seed area. The purpose of the study was to study the annual dynamics of ammonium and nitrate nitrogen in a soil with P. sylvestris with a closed root system using encapsulated urea with hydroquinone and mulch. The objectives of the study were based on the study of the effect of mineral fertilizers on the annual dynamics of ammonium and nitrate nitrogen and their effect on the growth of seedlings. The object of the study was the dynamics of the content of these nitrogen compounds in the soil. The study was carried out by methods of agrochemical, biometric and statistical analysis. Thus, the use of extended-form carbamide makes it possible to cover the need of plants for nitrogen nutrition throughout the growing season, having a significant impact on their growth in stem height. The use of encapsulated carbamide with hydroquinone, 0.5 cm pine mulch, potassium monophosphate and phosphorous flour allows the production of the best P. sylvestris seedlings with a maximum height of 188.82±15.41 mm per year due to constant saturation of the soil with available nitrogen, on which a change in the growth rate of seedlings is almost directly dependent (R = 0.99821-0.99988; Multiple R = 0.99643-0.99977; Adjusted R = 0.98928-0.99930; p < 0.01525-0.05978). At the same time, ammonium nitrogen has the greatest effect on it (p < 0.01633-0.05436).