Assessing the suitability of soils for boehmeria nivea on the agricultural production land of Nhu Xuan district - Thanh Hoa province

Abstract

This study was carried out on 15,944.36 hectares of agricultural land in Nhu Xuan district, Thanh Hoa province. The results of soil quality assessment and mapping of soil units for Boehmeria nivea have identified 32 soil units belonging to 4 soil types of 2 main soil groups: Ferralsols and Luvisols, of which the area is Ferralsols group is 98.97%. The area of each soil unit has a large difference, the smallest soil unit has an area of only 0.2 ha and the largest soil unit is 7,255.08 ha. Agricultural land in Nhu Xuan district has a thick soil layer, located mainly on high terrain, the area with slopes from flat to 15⁰ accounts for about 95%. Most of the agricultural land has low fertility, low content of total nitrogen (N), easily digestible phosphorus (P₂O₅), easily digestible potassium (K₂O), total organic matter (OM) and exchangeable absorptive capacity (CEC) in the soil; The pH_H2O in the soil ranges from moderately acidic to very acidic. The results of soils suitability assessment show that most of the agricultural land in Nhu Xuan district is suitable for growing Boehmeria nivea. However, the area of S3 accounted for 40.38% due to limited slope, acidic soil, low content of nutrients in the soil. The degree of land unsuitability accounts for only 0.22% due to the limitation of slope greater than 25⁰, located in high mountains, with this height not suitable for growing Boehmeria nivea.