Biological N ₂ fixation, C accumulation and water-use efficiency (δ ¹³ C) of chickpea grown in three different soil types: response to the addition of biochar from poultry litter and acacia

Post-Tin-Mining Agricultural Soil Regeneration Using Local Organic Amendments Improve Nitrogen Fixation and Uptake in a Legume–Cassava Intercropping System

“…The dolomite treatment, on the other hand, promoted N 2 -fixation, resulting in the lowest δ 15 N values (Figure 2A), but ultimately resulted in the lowest amount of N 2 fixed in terms of mass due to its shoot biomass being the lowest. Liming acid soils can improve macro-and micronutrient availability (such as P, Mo, Ca, and Mg) in soils, which can increase N 2 -fixation in legume species [18,19,22]. In the present study, however, no correlation between soil pH and δ 15 N was observed, suggesting that other factors may have contributed to this phenomenon.…”

“…The amount of N input via N 2 -fixation, a primary source of N in organic farming, is an important factor in the N balance of legume-based agroecosystems [14]. The application of soil amendments such as lime or dolomite increases N 2 -fixation in legumes, particularly in tropical soils [7,[17][18][19]. The increased availability of macronutrients (phosphorus, potassium, and sulfur) and micronutrients (boron and molybdenum) increase N 2 -fixation in legumes in soils amended with charcoal [20][21][22].…”