Green mass of amaranth as an alternative of mineral fertilizers

The cheapest substitute for mineral fertilizers are siderates, the value of which depends on the type of culture grown and the amount of green mass that was ploughed.In the zone of sufficient moisture, the cultivation of after-the-harvest crops for green manure is particularly promising.Amaranth is very suitable for growing as a green fertilizer, as it does not require a large amount of moisture for germination and during the growing season, has a fast pace of development, blooms after one and a half months, forms approximately 40 t/ha of nitrogen-rich vegetative mass.On the research field of the Lviv National Environmental University, on dark-gray podzolized light-loamy soil, studies were conducted on the structure of the crop of green mass of amaranth varieties intended for sideration.Varieties of amaranth differed in plant height, this indicator varied from 162 cm to 228 cm.The Ultra variety was the smallest, and the Kharkivskyi 1 variety was the tallest.The weight of the plant also varied widely, from 267 g to 419 g.The number of plants per m 2 varied within 18-21 pcs/m 2 .Based on the yield of green mass and the content of nutrients in amaranth, it was established that the Kharkivskyi 1 amaranth variety provided the highest yield of green mass (88 t/ha).The highest content of nitrogen (2.58 %), phosphorus (1.04 %) and potassium (4.86 %) in the green mass was in the Studentskyi variety.Amaranth varieties with a high level of green mass yield (48-88 t/ha) can be one of the best siderate fertilizers and an important source of nutrient supply to the soil (656.3-1505.6).