硬茬复播玉米和大豆田主要杂草及化学防除技术研究

Studies on Techniques of Weed Chemical Control in Corn and Soybean Fields Seeded on Unfallowing Wheat Fields

硬茬复播田杂草种类达15科27种。采用除草剂JNH－1，JNH－2或JNH－3进行苗前土壤处理，对已出苗和未出苗的杂草皆有极显著防效，一次用药不仅可保证作物苗期免遭草害，而且对作物生育后期的杂草也可达到有效控制。所用除草剂均对玉米、大豆安全。由于有效减轻了草害和虫害，大豆平均增产19．4％，玉米平均增产26．2％。

The techniques of weed chemical control were studied in corn and soybean fields seeded on unfallowing wheat fields. The experiments employed a randomized block design. Results showed that the treatments that included JNH-1, JNH-2 and JNH-3 had very significant control effects for weeds which amount to 15 families, 27 species in the unfallowing wheat fields. The treatments were carried out before the emergence of weed seeding. Then it did not only restain the emergence of some weeds seeding, but also hot the growth of some weeds. Therefore, it is very effective to prevent the crops from weed injury. Moreover it can effectively control the weeds that emerge in later period of crop growing season. all treatments were safe to corn and soybean.