To improve soil fertility, it is necessary to apply organic waste taking into account its chemical composition, sanitary and bacteriological characteristics and environmental impact. In the Kalmansky district of Altai Krai, on black soil of ordinary low-moisture medium humus medium loamy was carried out the development of methods of assessment and safe application of organic wastes, such as sewage sludge from municipal sewage treatment plants of Barnaul city and poultry manure from the poultry farm “Molodezhnaya”. To assess organic wastes and their suitability for improving soil quality, a decision support information technology, “Recultivant,” was created. It was developed in the integrated development environment Visual Studio on the Python programming language. To verify the obtained data, field experience was incorporated into the ITPPD “Recultivant”. Poultry litter and sewage sludge applied as fertilisers for fertility improvement had an effect on the agrochemical characteristics of the soil. In the field experiment, actual yields were obtained and compared with the calculated yields from IPPI Recultivant. The content of all heavy metals and arsenic in the green mass of oilseed radish does not exceed the maximum permissible concentrations. Based on the results of the assessment of sewage sludge from the city of Barnaul and caged chicken litter obtained from JSC “Molodezhnaya Poultry Farm”, the ITPPD “Recultivant” formulated a recommendation on their use as organic fertiliser and recultivant of degraded and unproductive soils without additional preparation.