THE EFFECTIVENESS OF DIFFERENT FORMS OF NITROGEN FERTILIZER IN THE EARLY-SPRING FERTILIZATION OF WINTER WHEAT IN THE CONDITIONS OF UNSTABLE MOISTURE OF THE STAVROPOL TERRITORY

Abstract

The studies on the impact of early-spring nitrogen fertilizer on the productivity and
quality of winter wheat grain were conducted in the conditions of unstable moisture in the
Stavropol Territory on the experimental field of the Laboratory of Soil Science and
Agrochemistry of FSBSI “North Caucasus Federal Agricultural Research Center”. Along with
the main application of 0.1 t/ha of ammophos (N12Р52), fertilization with various forms of
nitrogen fertilizer contributed to a significant increase in crop yield by 0.7-1.04 t / ha. It was
established that using all forms of nitrogen fertilizer had a high efficiency, but the highest
yield of winter wheat was achieved with the application of ammonium nitrate (4.02 t / ha) and
the co-use of UAN-32 with ammonium thiosulfate (ATS) in the ratio of 4:1 – 4.10 t/ha. As a
result of the use of these forms of fertilizers, we obtained the highest economic indicators of
grain production in the experiment. The profitability was 33%, the profit was 12066-12326
rubles/ha, the cost of 1 ton of grain – 9119-9124 rubles. The addition of water-soluble
fertilizer NPK 13:40:13 and 20:20: 20 when fertilizing winter wheat with UAN-32 did not
have a significant effect on crop yield, but contributed to an increase in the content of wet
gluten in the grain in comparison with UAN-32 by 1.2%.