Synergistic Impact of Biochar and Organic Amendments on Field Bean (Vicia faba) Growth and Soil Characteristics

Abstract

Many studies have explored the effects of various biochar types and their combinations with inorganic fertilizers, but few have focused on identifying the most effective organic amendments when used with biochar in sandy loam soil. This study aims to determine the impact of different biochar doses combined with organic amendments on plant growth and yield (Vicia faba) in sandy loam soil. Biochar doses of 15, 20, and 25 t/ha were applied in combination with organic amendments such as farmyard manure (FYM), vermicompost (VC), Ghanajeevamruth (GA), and their various combinations. The effectiveness of these treatments was compared to the use of biochar alone. Results indicated that the combination of biochar and organic amendments significantly increased average pod number (by 36.19% to 88.63%) and pod weight (by 24.11% to 83.18%) compared to biochar alone. Higher biochar doses consistently resulted in increased pH levels in the soil, regardless of the organic amendment used. Additionally, biochar combined with organic amendments led to higher nutrient levels, including nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur, compared to biochar alone. The study concluded that biochar, particularly in combination with Ghanajeevamruth, had superior effects on plant growth and yield. The choice of amendment and biochar dose significantly influenced soil pH, nutrient availability, bulk density, and water holding capacity. These findings confirm the potential of combining biochar with organic amendments to enhance soil fertility and agricultural productivity, offering valuable strategies for sustainable nutrient management in sandy loam soils.