Comparison of soil organic carbon and total nitrogen stocks between farmland treated with three and six years level soil bund and adjacent farmland without conservation measure: In the case of southwestern Ethiopia

PLoS One. 2021 May 27;16(5):e0252123. doi: 10.1371/journal.pone.0252123. eCollection 2021.

Abstract

This study was conducted to examine and compare the status of soil organic carbon (SOC) and total nitrogen (TN) stocks between farmlands treated with level soil bund (LSB) of three and six years and adjacent farmland without conservation measure (control) at Somodo Watershed. Soil samples were collected from farmland treated with LSB-3 years, LSB-6 years and control using randomized complete block design. A total of 108 composite soil samples (3 treatments * 6 replications * 3 bund zones * 2 depths (0-20 and 20-40 cm) were collected for analysis and determination of the Organic Carbon fraction (OC) and Nitrogen fraction (N). OC was determined using Walkley and Black method while N was determined using the Kjeldahl digestion, distillation and titration method. The result indicated that farmland treated with LSB-6 years has insignificantly higher SOC (98.43±11.55 Mg ha-1) and TN (9.37±1.10 Mg ha-1) stock than control SOC (93.01±13.51 Mg ha-1) and TN (9.28±1.60 Mg ha-1) stock. Likely, farmland treated with LSB-6 years has insignificantly higher SOC and TN stock than farmland treated with LSB-3 years SOC (96.61±11.45 Mg ha-1) stock. With respect to the age of LSB, farmland treated with LSB-6 years accumulated more SOC stock (5.83%) than control. This study revealed that the age of LSB conservation measures has a critical role in enhancing soil fertility through maintaining and sequestering SOC and TN.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Agriculture / methods*
  • Carbon / analysis*
  • Ethiopia
  • Nitrogen / analysis*
  • Soil / chemistry*

Substances

  • Soil
  • Carbon
  • Nitrogen

Grants and funding

Ethiopian Institute of Agricultural Research is the institution that supported this study. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.The corresponding author received a salary from the funders.