Study of Dynamics of Mobile Forms of Nitrogen, Phosphorus and Potassium in Cryogenic Meadow-Chernozem Soil of Central Yakutia in the Field Experiment with the Currants

Abstract

In this study, the practice of use of mineral macro and micro fertilizers together with irrigation in culturing of blackcurrant on frozen meadow-chernozemic soils of Сentral Yakutia has been demonstrated. Object of study is the variety of blackcurrant of Yakutian selection – Yakutskaya. Experiments were carried out under the following scheme: 1) Сontrol, without fertilizer; 2) NPK; 3) NPK + humus; 4) NPK + microelements. We used the standard methods of investigation in this experiments. The content of mobile forms of nitrogen, phosphorus and potassium in studied soil has been estimated. We used the standard methods of investigation in this experiments. So, nitrate nitrogen was determined with phenoldisulfonic acid, ammonia nitrogen – with the Nesler reagent, mobile phosphorus – by the Ginsburg-Artamonova, exchange potassium – by the Maslov. It was revealed, that the content of mobile forms of nitrogen, phosphorus and potassium in studied soil of Central Yakutia is low, but mobile phosphorus – high. The dynamics of nutrition regime of the soil in conditions of different soil fertility values was studied. It was found that the average content of available forms of nitrogen, phosphorous and potassium in frozen meadow-chernozemic soil was increased in all fertilized variants as compared to control samples. It was noted that during blackcurrant vegetation period the higher demand in these elements was observed during the ripening phase.