Uman NUH | today: 06/23/2022

Justification of the limit of expediency of using potash fertilizers

Author(s) Hospodarenko G.M., Doctor of Agricultural Sciences, Professor, Uman National University of Horticulture, Ukraine
Martynyuk A.T., Candidate of Agricultural Sciences, , Uman National University of Horticulture, Ukraine
Cherno O.D., Candidate of Agricultural Science, Associate Professor of Department of Agricultural Chemistry and Soil Science, Uman National University of Horticulture, Ukraine
Category The Agronomy
year 2021 issue Issue number 99. Part 1
pages 68-80 index UDK 303.4: 631.83
DOI 10.31395/2415-8240-2021-99-1-68-80 (Link)
Abstract The issues of the recoupment of potash fertilizers are considered, which is one of the most controversial in agronomy, since it is precisely this that determines the need for fertilizers and the economic efficiency of their use. It is shown that the payback of fertilizers is a complex value and not constant in different crops. The increase in yield from fertilizers in kind is taken on the basis of field experiments with fertilizers carried out on podzolized chernozem in the Uman NUS. The cost of the increase in yield from the use of potash fertilizers was determined by the average actual sales prices of products prevailing on the market through various sales channels in the 6th quarter of 2021. collecting a yield increase from potash fertilizers. The cost of potash fertilizer was taken at the current price of 16000 UAH/t with the addition of a margin for their delivery to the farm. The costs for the use of fertilizers on the farm and for collecting the increase in yield were set calculated according to the accepted standards. The difference between the value of the yield increase (YI) and additional costs (AC) gives the net income received from the use of fertilizers. The ratio of the cost of increasing the yield to additional costs shows their payback. On the basis of comparing the indicators YI and AC, the boundaries of the economic efficiency of the use of fertilizers were determined: YI>AC (general expression of the task). The minimum necessary increase in yield from fertilizers and the limits of the increase in prices for potash fertilizers were also calculated. It has been established that at a price for potassium chloride of 16000 UAH /t and the cost of its use in optimal doses for field crops against the background of a balanced nitrogen-phosphorus nutrition, the cost of an increase in yield is 1164–14820 UAH/ ha. Payback (unprofitableness) of 1 kg. potash fertilizers vary in a wide range – from – UAH 18.6 to 104,0, depending on the crop. The limit of the unprofitable price per unit of the active substance of potash fertilizers at the optimal dose of application depends on the crop and is in the range of 6.9–129,5 UAH/ha. With the current disparity in prices for crop products and potassium chloride, its use is unprofitable for winter rye, spring barley, grain sorghum and sugar beet (when applied against a background of 40 t/ha of manure). This is due to the availability of podzolized chernozem with mobile potassium compounds, biological characteristics of crops and technologies for their cultivation.
Key words potash fertilizers, agricultural crops, fertilizer payback, loss threshold, price increase limit
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