MONITORING OF THE AGRO-ECOLOGICAL CONDITION OF THE SOILS OF INDIVIDUAL TERRITORIAL COMMUNITIES OF THE VOLYN POLISSYA

Abstract

The results refer to soil surveys of Loknytska and Zarichnenska territorial communities, Varas district, Rivne region. The largest areas of agricultural land out of the surveyed areas are occupied by drained floodplain turf muds – 9,074.7 ha (33.4%), drained peat bogs and shallow peat bogs – 3,689.2 (13.6%) and turf and podzolic muds drained soils - 2668.3 ha (9.8%). We determined the agroecological indicators of the most common soils. These soils are mainly of low quality, mostly seventh and eighth grades. The average indicator of soil evaluation is 31 points. Soils of very low quality occupy 5.5 thousand hectares and belong to the ninth class. Areas of soils with low quality are 19.4 thousand hectares, of which 7.6 and 11.8 thousand hectares are of the seventh and eighth grades, respectively. Soils of average quality occupy 2.2 thousand hectares, of which 0.1 are of the fifth class, and 2.1 thousand hectares are of the sixth class. Areas of unusable land amount to 0.03 thousand hectares and belong to the tenth quality class. The assessment of soils varies by village communities (village councils) from 26 to 38 points. The lowest indicator of land quality assessment is in Novorichytskyi hromada, it is 26 points, the highest indicator is in Kukhchensk hromada. We determined that the areas of eroded soils with unsatisfactory content of alkaline hydrolyzed nitrogen, mobile forms of phosphorus and potassium have significantly increased in recent decades. The areas of soils with an acidic reaction of the environment also increased significantly. According to the data of 2015, the average content of humus is 2.7%, alkaline hydrolyzed nitrogen is 203 mg/kg, phosphorus is 81 mg/kg, potassium is 46 mg/kg of soil, the average value of pH is 5.1. The average content of humus in 2020 was 2.8%, alkaline hydrolyzed nitrogen was 193 mg/kg, phosphorus was 111 mg/kg, potassium was 80 mg/kg of soil, the average pH value was 5.1. The obtained data allow us to see the general trend of changes in the condition of arable soils over the past three to five decades.