REGIONAL FEATURES AND EVALUATION OF THE METHODS AIMED AT LABILE PHOSPHATES DETERMINATION IN THE SOIL OF NOVOSIBIRSK REGION

Abstract

The paper summarizes the results of many-year research on applying the existing methods for determining labile phosphates aimed at evaluation of the phosphorus fertilizers effect. The standard methods of phosphorus determination according to Truog and Chirikov suggests extracting a large amount of hard-to-reach forms from the soil. The existing scales for determining the soil needs inside this element for crops do not allow to evaluate objectively the fertility of black soil in the Novosibirsk Region. The application of buffer mixtures, acid and salt extractants for the diagnosis of phosphorus nutrition of plants is discussed. The authors suggest to explore black soil according to the Nikolov method and the LAC- method. They characterize the actual reserves of available phosphorus in the soil. During the growing season, it is necessary to carry out operational diagnostics using Karpinsky–Zamyatina method. The method determines the degree of transition of phosphorus to the soil fluid and the presence of residual phosphates. The amount of energy required to extract phosphorus from soil compounds is suggested to be determined by the Scofield method. Its value depends on the absorption properties of the soil and is regional in nature. For all the methods studied the new scales for the supply of black soil in the Novosibirsk Region were proposed. These scales give opportunity  to find out the appropriateness of applying phosphorus fertilizers and give a correct assessment during the study of the diagnosis of phosphorus nutrition of plants.