Central Region Agricultural Research Center, National Agriculture and Food Research Organization Tsukuba, Ibaraki, Japan.
Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan.
PLoS One. 2019 Jul 31;14(7):e0220236. doi: 10.1371/journal.pone.0220236. eCollection 2019.
Biochar is widely used as a soil amendment to increase crop yields. However, the impact of the interaction between the biochar and microbial inoculants (e.g., biofertilizer) on plant nutrient uptake and yield in forage rice is not fully understood. A greenhouse study was conducted to evaluate the synergistic effects of rice-husk biochar and Bacillus pumilus strain TUAT-1 biofertilizer application on growth, yield, and nutrient uptake in two forage rice genotypes; Fukuhibiki and the newly bred line, LTAT-29. Positive effects of biochar and biofertilizer, alone or in a combination, on growth traits, nutrient uptake, and yield components were dependent on the rice genotypes. Biochar and TUAT-1 biofertilizer influenced the overall growth of plants positively and increased straw and above-ground biomass in both genotypes. However, although biochar application significantly increased grain yield in LTAT-29, this was not the case in Fukuhibiki. Biochar and TUAT-1 biofertilizer, either alone or combined, significantly affected plant nutrient uptake but the effect largely depended on rice genotype. Results of this study indicate that biochar amendment and TUAT-1 biofertilizer can enhance forage rice productivity depending on genotypes, and therefore, there is a need to consider plant genetic composition when evaluating the potential for crop response to these soil amendments before application on a commercial scale.
生物炭被广泛用作土壤改良剂，以提高作物产量。然而，生物炭与微生物接种剂（如生物肥料）之间的相互作用对饲料稻中植物养分吸收和产量的影响还不完全清楚。本研究采用温室试验，评估了稻壳生物炭和短小芽孢杆菌 TUAT-1 生物肥料联合施用对两个饲料稻品种（福谷比基和新培育的 LTAT-29）生长、产量和养分吸收的协同效应。生物炭和生物肥料单独或联合施用对生长特性、养分吸收和产量构成的正向影响取决于水稻基因型。生物炭和 TUAT-1 生物肥料均能促进植物的整体生长，增加两个品种的茎秆和地上生物量。然而，尽管生物炭的应用显著提高了 LTAT-29 的籽粒产量，但在福谷比基中却并非如此。生物炭和 TUAT-1 生物肥料单独或联合施用均显著影响植物养分吸收，但这种影响在很大程度上取决于水稻基因型。本研究结果表明，生物炭改良剂和 TUAT-1 生物肥料可以根据基因型提高饲料稻的生产力，因此，在大规模商业应用之前，需要考虑植物的遗传组成，评估这些土壤改良剂对作物的潜在响应。
