生物炭(BC)是由有机废物热解形成的有机化合物。应用BCs作为土壤改良剂有许多好处,包括固碳,提高土壤肥力和可持续农业生产。在本研究中,我们酸化了由稻草制成的不同BCs,稻壳,小麦秸秆,棉秆,家禽粪便,甘蔗压榨泥浆和蔬菜废料;接下来,我们把它们应用在一系列的盆栽实验中。比较了酸化和非酸化的BCs对种子萌发的影响。土壤特性(EC,pH)营养成分(P,K,Na)和有机物。治疗包括一个对照,和所有上述BC(酸化的和非酸化的)以1%(w/w)的比率施用于土壤。选择玉米作物作为试验作物。结果表明,酸化后的家禽粪肥BC显著提高了发芽率,射击长度,与其他BC及其各自的对照植物相比,玉米幼苗的生物量。然而,酸化的BCs导致营养素含量显著降低(P,K,Na)的土壤,玉米幼苗,以及与未酸化的BCs相比的土壤有机质含量。但是与对照治疗相比,所有BCs处理(酸化和非酸化)均提供更高水平的营养素和有机物含量。结论是,没有一个BCs(酸化和非酸化)对土壤条件和玉米生长造成负面影响。此外,BC在应用于碱性土壤之前的酸化可能改变了土壤化学,并使玉米生长更好。往前走,需要更多的研究来了解改性BCs对不同土壤养分动态的长期影响。此外,BC应用时机的可能影响,应用率,颗粒大小,和作物物种必须进行系统评估。
Biochar (BC) is an organic compound formed by the pyrolysis of organic wastes. Application of BCs as soil amendments has many benefits including carbon sequestration, enhanced soil fertility and sustainable agriculture production. In the present study, we acidified the different BCs prepared from rice straw, rice husk, wheat straw, cotton stalk, poultry manure, sugarcane press mud and vegetable waste; following which, we applied them in a series of pot experiments. Comparisons were made between acidified and non- acidified BCs for their effects on seed germination, soil properties (EC, pH) nutrient contents (P, K, Na) and organic matter. The treatments comprised of a control, and all above-described BCs (acidified as well as non-acidified) applied to soil at the rate of 1% (w/w). The maize crop was selected as a test crop. The results showed that acidified poultry manure BC significantly improved germination percentage, shoot length, and biomass of maize seedlings as compared to other BCs and their respective control plants. However, acidified BCs caused a significant decrease in nutrient contents (P, K, Na) of soil,maize seedlings, and the soil organic matter contents as compared to non- acidified BCs. But when compared with control treatments, all BCs treatments (acidified and non-acidified) delivered higher levels of nutrients and organic matter contents. It was concluded that none of the BCs (acidified and non-acidified) had caused negative effect on soil conditions and growth of maize. In addition, the acidification of BC prior to its application to alkaline soils might had altered soil chemistry and delivered better maize growth. Moving forward, more research is needed to understand the long-term effects of modified BCs on nutrient dynamics in different soils. In addition, the possible effects of BC application timings, application rates, particle size, and crop species have to be evaluated systemtically.