ABSTRACT

The application of bio-inoculant and biochar can be an effective strategy for stimulating crop growth, while improving soil fertility in an environmentally friendly manner. A greenhouse experiment was conducted to study the effects of biochar and TUAT-1 bio-inoculant under two N fertilization modes (basal and split) on the yield of forage rice and nutrient distribution in the soil rhizosphere. Positive effects of the biochar and bio-inoculant, either alone or in combination, on growth, photosynthesis rate, and yield components were depended on the mode of N application. There was no change in either microbial biomass carbon (MBC) or microbial biomass nitrogen (MBN) with the treatments of biochar and bio-inoculant with split N fertilization, whereas both these treatments, either alone or in combination, resulted in higher MBC and MBN with basal N fertilization. The NO₃⁻–N concentration of surface floodwater under biochar treatment was significantly reduced immediately after soil N fertilization, whereas biochar addition did not reduce the NH₄⁺–N concentration of surface floodwater at each of our monitoring points. The findings indicate that biochar and the mode of N fertilization have the potential to improve forage rice productivity and soil nutrient availability, while minimizing the potential of nitrate (NO₃⁻–N) leaching.

摘要

生物接种剂和生物炭的应用可以成为刺激作物生长的有效策略，同时以环保的方式提高土壤肥力。通过温室试验研究了生物炭和TUAT-1生物菌剂在两种氮肥模式（基础和分裂）下对饲用稻产量和土壤根际养分分布的影响。生物炭和生物接种剂（单独或组合）对生长、光合作用速率和产量成分的积极影响取决于施氮方式。生物炭和生物接种剂与分裂 N 施肥处理的微生物生物量碳 (MBC) 或微生物生物量氮 (MBN) 没有变化，而这两种处理，无论是单独的还是组合的，导致基础施氮肥的 MBC 和 MBN 较高。没有土壤施氮后，生物炭处理的地表洪水₃ ^- -N 浓度立即显着降低，而生物炭的添加并未降低我们每个监测点的地表洪水的 NH ₄ ^{+ -N 浓度。}研究结果表明，生物炭和施氮模式具有提高牧草水稻生产力和土壤养分有效性的潜力，同时最大限度地减少硝酸盐（NO ₃ ^- -N）浸出的可能性。