阿特拉津对不同种子大小品种大豆的危害

玉米和大豆轮作是我国东北地区应用广泛的种植方式，但玉米田除草剂阿特拉津常引起下茬大豆药害。选用东北地区推广应用的45个不同种子大小的大豆品种（粒重范围81～302 mg/seed）进行温室盆栽试验，探讨大豆地上冠部和地下根系对阿特拉津危害的响应。结果表明，阿特拉津在土壤中有效成分用量为500g/hm2的条件下，大豆地上部干物质生产随种子重量增加而增加，呈显著正相关（P＜0.05），而根系干物质生产与种子大小未呈显著正相关（P＞0.05）。这说明大粒品种大豆对阿特拉津耐药性强，小粒品种则敏感，因此，种植大粒品种大豆或品种中大粒种子，可使阿特拉津对大豆危害降到最低。 

Effect of atrazine on soybeans with various seed size varieties

Maize (Zea mays L.) and soybean Glycine max (L.) Merr.] are frequently grown in rotation throughout Northeast China. Soybeans injury often occurs when soybeans are grown in fields treated with atrazine 2-chloro-4, 6-bis-(ethy1amino)-s-triazine] the previous year for control of weeds in maize. Pot culture experiments were conducted to examine 45 soybean varieties with various seed size (seed weight range 81﹣302 mg/seed) for the response of soybean shoot and root injury from atrazine in the greenhouse. The results showed that dry shoot weight production of soybean grown in soil treated-atrazine generally increased significantly (P＜0.05) as seed size increased, while root dry weight production of soybean did not increased nonsignificantly (P＞0.05) as with larger seed size increased. The results indicated that large-seeded varieties of soybeans are more tolerant ofted atrazine better than small-seeded varieties. We suggest soybean injury from atrazine may could be reduced by planting large-seeded varieties or planting the largest seed from a given variety.