阿特拉津对不同种子大小品种大豆的危害

Effect of atrazine on soybeans with various seed size varieties

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81～302mg/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,种植大粒或中大粒品种,可使阿特拉津对大豆危害降到最低。

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 500g/hm^2 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.