CONCLUSION
This study showed wide variability in soil
nutrients among locations and even between soil
depths, which may be influenced by various
environmental and cultural factors including soil
nutrient management. The nitrogen level in the soil
was low which may result in nutrient imbalances
in many orchards. The available P and K seemed
to be accumulated in the top soil layer; however,
their levels were within the recommended range.
The difference in nutrient levels between the
surface soil (0–20 cm) and the subsoil (21–40 cm)
also indicated that collecting soil samples from
two depths was necessary for nutrient content
analysis in Bhutanese soils.