不同生物炭浸提液对水稻发芽及幼苗发育的影响

使用不同生物炭浸提液对水稻种子进行培养，研究生物炭种类对水稻萌发和幼苗发育的潜在影响。3 种生物炭为竹炭、烟杆炭和稻杆炭，生物炭浸提液梯度为原液（1:5）、10 倍稀释液和50 倍稀释液，处理培养后观察水稻种子发芽率和幼苗生长情况。烟杆炭原液处理培养后第3 天水稻种子发芽率只有8.7%，远低于对照的43.3%，芽根长度、干鲜重等指标也均显著低于对照（p<0.05）。所有低浓度的生物炭浸提液对水稻萌发具有一定促进作用。竹炭10 倍浸提稀释液的发芽率比对照高9.3%，烟杆炭和稻杆炭50 倍浸提稀释液的发芽率比对照高11.3%，但芽根长度、干鲜重等指标大部分与对照无显著差异。本结果初步证明高浓度烟杆炭对水稻生长具有抑制作用，而适当的生物炭用量则有益于水稻生长。

Effects of Different Biochar Extracts on Rice Germination and Seedling Development

In order to explore the effects of different biochars on rice germination and seedling development, different biochars extracts were used to culture the rice seed. Three kinds of biochars are bamboo biochar, tobacco stem biochar and rice straw biochar, three concentrations of biochars extract are original extracts, 10 times diluent and 50 times diluent, and seed germination and seedling growth was observed after cultivation. The third day’s rice germination rate was only 8.7% after treated by the un-diluted tobacco stems biochar extract, which was much lower than the control of 43.3% . At the same time, the length and weight of rice seedlings were also significantly lower than the control (p<0.05). However, the diluted biochar extracts showed a stimulation effect on the rice germination. Compared with the control, the germination rate treated by the bamboo biochar extract diluted by 10 times was 9.3% higher and it was 11.3% higher with the tobacco stem and rice straw biochar extracts diluted by 50 times. However, the seedling length and weight treated by all extract diluents showed no significant difference with the control. Results suggested that the high concentration of tobacco stems biochar inhibit rice germination and growth, but an appropriate level of biochar would be benefit.