Effects of chemical herbicides on bio-communities in agroecosystems;

Weed is the worldwide pest of farmland, as the widely using of chemical herbicide, the side-effect become more and more evidence, such as resistance, environment pollution, the harm of herbicide to crops, the alternation of weed community, so some new measurement should be developed.

The effects of chemical herbicides on the community of insect enemies in rice fields and non-rice fields were studied in this paper.

chemical herbicides should be rationally selected and applied,according to the different purpose of weed control.

This experiment research is that when they were used in the Bermuda grass turf the Caopingning-51 herbicide and Caopingning-71 herbicide controlled the effect of weed which the Caopingning-51 herbicide and Caopingning-71 herbicide were used by way of solitude and combination.

Pinoxaden is an excellent herbicide in the control of weeds in wheat field.

Study of the weed situation in southern orchards and chemical weeding;

Application of chemical weeding in tending of Chinese fir young plantation

Technical measures,effects and benefits of chemical weeding in young eucalypt plantation tending were analyzed in this paper.

Current status and problems of chemical weed control in Heilongjiang Province;

Studies on the Technique of Chemical Weed Control in Narrow Row Solid-Seeding Soybean Field;

Current problems in chemical weed control in China include substandard spraying equipment, the frequent occurrence of herbicide-induced crop injury, crop damage due to long residual herbicides, rapid weed population shifts, and the increased difficulty of chemical weed control brought about by crop damage from hard-to-control species.

) Nees,were observed in fields of direct seeded rice,and effect of herbicides and water management on the weed assesed.