Effectiveness of corn stalk biochar in amending the contaminated soil attributes and enhancing the sustainable grass growth

It is important to rapidly amend the hostile rural soil fertility and quality to develop green land verdure. In this research, cornstalk-derived biochar was added (sequence proportions 0, 1, 5, 10, 20, and 50 % in the mass ratio) into hostile rural soil and then the grass was grown in the pots. The findings indicated that the biochar addition caused substantial enhancement in soil black carbon, organic carbon total nitrogen, available potassium, and phosphorus by more than 4.6, 1.7 1.6, 0.3, and 4.7 times, correspondingly. Grass dry matters (DM) enhanced proportionally with enhancing the quantity of applied corn stalk biochar (69%) owing to enhancement in plant minerals nutrition. Treatment of biochar highly enhanced the total quantities of the soil's heavy metal contents. However, 36 to 90 % of heavy metal contents in treated soil were concentrated in residual fractions with lower bio-availability. Thus, the accumulation of heavy metal contents in the grass above-ground biomass was greatly decreased through biochar application. Our findings showed that corn stalk-derived biochar could be suggested in hostile rural soil as soil ameliorates at an amount of 50%. Conversely, the environmental hazard due to the heavy metals accumulation in the soil treated by corn stalk biochar should be sensibly considered.