为了研究PS04菌株分泌物对化感稻苗生长及其抑草效果的影响，以化感稻3号和化两优78为材料，用6个不同浓度（0、1/100、1/150、1/200、1/250和1/300容积比）的PS04菌株分泌物分别对水稻进行浸种或喷施幼苗叶片处理，分别在28℃和22℃下测定其对化感稻幼苗的影响，并观测各处理的化感稻与稗草混种对稗草生长的影响。结果表明，28℃下，以1/300浓度PS04菌株分泌物溶液浸种化感稻3号和喷施化两优78叶片效果较好，既可以提高化感稻的生长，又不会影响其对稗草的抑制作用；22℃下，以1/200、1/250和1/300浓度喷施化两优78号叶片效果较好，均能促进其生长，并使与化两优78号混种的稗草存活率降低；1/100和1/250浸种以及1/250浓度PS04菌株分泌物溶液喷施叶片或者浸种+喷施叶片，均能促进化感稻3号的生长，也能够显著抑制各处理下与化感稻3号混种的稗草的生长。可见，PS04菌株分泌物溶液对化感稻苗的生长有促进作用，并能增强其对稗草的抑制效果。

In order to study the effects of bacillus polymyxa PS04 secretions on the growth and herbicidal effect of alleloptic rice seedlings, The authors set six different concentrations of PS04 secretions （0, 1/100, 1/150, 1/200, 1/250 and 1/300 volumetric ratio） to soak seeds and spray leaves, respectively, using Huagandao 3 and Hualiangyou 78 as materials. And under 28℃ and 22℃, investigated the effects of PS04 secretions on allelopathic rice and on the growth of barnyardgrass after mixed planting allelopathic rice and barnyardgrass, respectively. The results showed that soaking seeds of Huagandao 3 and spraying leaves of Hualiangyou 78 at the 1/300 concentration of PS04 secretions at 28℃ could improve the growth of two kinds allelopathic rices, but not impact its function of inhibition of grass. And at 22℃, using 1/200, 1/250 and 1/300 concentration of PS04 secretions to spray the leaves Hualiangyou 78 improved its growth, and decreased the barnyardgrass survival rates; 1/100 and 1/250 concentration of PS04 secretions soaked seeds and 1/250 concentration of PS04 secretions sprayed leaves or soaked seeds + sprayed leaves, which improved the growth of Huagandao 3, and also significantly impacted the growth of barnyardgrass mixed planting with Huagandao 3. PS04 secretions could promote the growth of alleloptic rice seedlings and enhance its inhibition of barnyardgrass.