Abstract: In order to explore a better intercropping model of millet with soybean, varieties ‘Nongda 8’ and ‘Jindou 25’, were selected as experimental materials for millet and soybean, on the basis of no nitrogen fertilizer, 5 treatments of intercropping ratio of millet to soybean, including 6:0 (T1), 2:4 (T2), 3:3 (T3), 4:2 (T4) and 0:6 (T5) were set up. Photosynthetic characteristics and yield of millet and soybean in different treatments were detected. The results showed that chlorophyll content of soybean in different treatments had no significant difference compared with single cropping mode. While chlorophyll content of millet in different treatments had a certain increasing trend, treatment T2 was the most increasing one. Net photosynthetic rate, transpiration rate and stomatal conductance of millet under intercropping treatments increased significantly, and treatment T2 was the best one; while these photosynthetic indexes of soybean decreased significantly. The intercellular CO2 concentration of millet under intercropping treatment decreased, while that of soybean increased. The yield of millet increased by 2%～9% in intercropping mode, while the yield of soybean decreased by 29%～33%. The intercropping treatment of millet with soybean was better than single cropping mode in whole. Among them, T2 treatment was the best one. The results had certain guiding significance for the intercropping practice of intercropping of millet with soybean.

Key words: intercropping, millet, soybean, photosynthetic characteristics, yield

摘要： 为探究较好的谷子大豆间作模式，选用品种‘农大8号’和‘晋豆25号’作为谷子和大豆的试验材料，在不施氮肥的基础上，设置谷子和大豆间作比例为6:0（T1）、2:4（T2）、3:3（T3）、4:2（T4）、0:6（T5）共5个处理，检测不同间作比例对谷子和大豆的光合特性及产量的影响。结果表明，与单作模式对比，间作各处理条件下，大豆的叶绿素含量无显著差异，而谷子的叶绿素含量有一定的升高趋势，其中T2处理显著提高；间作条件下谷子的净光合速率、蒸腾速率和气孔导度均显著提高，T2处理综合表现最好，而大豆的光合指标则显著下降；间作处理下谷子的胞间CO2浓度下降，大豆则有一定上涨；在间作模式下谷子的产量升高2%～9%，T2处理产量最高，大豆产量下降29%～33%。T2、T3、T4的土地当量比均大于1，表明间作处理具有间作优势，其中T2处理表现最好，结果对谷子大豆间作实践具有一定指导意义。

关键词: 间作, 谷子, 大豆, 光合特性, 产量