Fertilizing winter crops is possible during the winter period, but it depends on a number of factors. Specifically, if the soil is completely frozen and no thaws are expected, such fertilization will be ineffective or completely ineffective. If there is a frozen layer of soil and the snow layer is low, about 1-2 cm, and a thaw is expected, meaning you know for sure that the snow will melt, the soil will also thaw quickly. And then it is possible to apply mineral fertilizers, primarily nitrogen, says scientist Serhiy Avramenkov.