Seed treatment with biomass-derived biochar has potential to overcome the moisture, nutrients, and hormonal constraint on native germination and early growth. An experiment was conducted to study the effect of different levels of biochars obtained from four divergent biomass on seed germination and seedling growth of maize and black gram. All the biochars were prepared at 500 °C and characterized for their physicochemical properties. We determined the effect of biochar type and application rate. The biochar under study enhanced the seed germination and seedling growth significantly at a reasonable application rate than higher rate which might be due to secretion of chemical substances by the respective biochar. But the pine needle biochar (PNB) did not perform satisfactorily, and it may be due to lignin-rich feedstock. Both the maize stalk biochar (MSB) and Lantana camara biochar (LCB) showed slightly inhibitory effect at higher application rate due to presence of some heavy metals. However, the black gram biochar (BGB) performed well and constantly increased seed germination as well as seedling growth, and thus has a greater potential to increase its application rate under field condition. The shoot/root ration decreased with increase in biochar application rate. Our results offer new facts for the requirement of creating environmental risk management of biochar before its field soil application.

用生物质衍生的生物炭进行种子处理具有克服水分，养分和激素限制本地发芽和早期生长的潜力。进行了一项实验，研究了从四种不同生物量中获得的不同水平的生物炭对玉米和黑克的种子萌发和幼苗生长的影响。所有生物炭均在500°C下制备，并对其理化性质进行了表征。我们确定了生物炭类型和施用率的影响。所研究的生物炭在合理的施用量下比较高的施用量显着提高了种子的发芽和幼苗生长，这可能是由于各个生物炭分泌化学物质所致。但是松针生物炭（PNB）的性能不能令人满意，这可能是由于富含木质素的原料引起的。马tana丹camara生物炭（LCB）由于存在一些重金属而在较高的施用量下显示出轻微的抑制作用。然而，黑克生物炭（BGB）表现良好，并不断增加种子发芽和幼苗生长，因此在田间条件下具有更大的潜力来提高其施用量。随着生物炭施用量的增加，苗的根/根比降低。我们的结果为生物炭在田间土壤施用前建立环境风险管理的要求提供了新的事实。