Assessment of Soil Fertility under Different Land-Use Systems in Dhading District of Nepal

Abstract

Unscientific land use and cropping techniques have led high soil erosion and degradation of soil quality in the mid-hills of Nepal. To understand the effects of land use systems for selected soil chemical properties in mid-hills, composite soil samples at 0 cm to 20 cm depth were collected from five different land-use systems: Grassland, forest land, upland, lowland, and vegetable farms from Dhading district of Nepal in 2017. Soil samples were analyzed for soil fertility parameters: Soil pH, organic matter (OM), total nitrogen (N), available phosphorus (P), available potassium (K) and its effect due to different land use systems were compared. Results showed that soil pH was neutral in vegetable farms (6.61), whereas the rest of the land-use systems had acidic soils. Soil OM (3.55%) and N (0.18%) content was significantly higher in forest, but the lowest soil OM (1.26%) and N (0.06%) contents were recorded from upland and lowland farms, respectively. Available P was the highest in the vegetable farm (41.07 mg kg−1) and was the lowest in grazing land (2.89 mg kg−1). The upland farm had significantly higher P levels (39.89 mg kg−1) than the lowland farm (9.02 mg kg−1). Available K was the highest in the vegetable farm (130.2 mg kg−1) and lowest in grazing land (36.8 mg kg−1). These results indicated that the land under traditional mixed cereal-based farming had poor soil health compared with adjacent vegetable, grazing, and forest lands among the study area. The variations in soil fertility parameters suggest the immediate need for improvement in soil health of traditional farmlands.

Assessment of soil metals status in parts of Rivers State, Nigeria

“…There was insignificant variation in levels of K. This is in agreement with study by (Kihara et al, 2016). The variations can be attributed to land use practices, leaching and adsorption in soil (Kharal, Khanal, & Panday, 2018 Jassogne, & Merckx, 2016). The mean level of Mn in soil was 4.21± 0.61 ppm which was within the WHO acceptable limit of ≤2,000 ppm.…”

Evaluation of spatial spreading of phyto-available sulphur and micronutrients in cultivated coastal soils

“…The variations of soil pH (from highly acidic (3.70) to alkaline (9.90), EC (from 0.01 dS m -1 (non-saline) to 7.45 dS m -1 (saline)) and SOC (from 0.02 to 3.74%) were wide ( Table 2 ). In line with our findings, Kharal et al [ 55 ] reported the variations in soil pH and organic matter content in soils of Nepal under different land uses. The variations of soil pH, EC and SOC the study area is ascribed to the effects of the soil types, prevailing climatic conditions, and adoption of different crop-management practices.…”

Analytical Study on Fertility Status and Soil Quality Index of Shorearobusta Forest, Central Nepal

“…These values (4.33-5.26 and 4. 74) are similar as reported by Paudel and Sah (2003) and Kharal et al(2018)in different S. robusta forests. Good S. robusta regeneration areas favor slightly acidic soils (Bhatnagar, 1965).…”