The present paper deals with the developmental zero and effective accumulative temperatures of the worst weeds, Paspalum thunbergii Kunth ex Steud、Polygounm lapathifolium Linnaeus、Digitaria sanguinalis (Linnaeus) Scop、Stellaria aleine Grimm、 Cyperus rotundus Linnaeus and Conyza canadensis (L) Cronq.

Study on control weeds growing in the Dichondra repens lawn during spring by different combination of chemicals in the southwest region of hunan province;

Efficacy Experiment of 10.8% HKUST Green Quizalofop-p-ethy EC Against Soybean Field Weeds;

The Experiment of Herbicides against Weeds of Trifolium repens L. in seedling period;

The contents of four heavy metal elements including Cu, Pb, Zn and Ni in 30 weed species collected from the sewage area near a smeltery were determined and analyzed.

In view of that Cd-Pb-Cu-Zn combined pollution of hyperaccumulated plant in phytoremediation is short of research at present, block test was first adopted to study their accumulative characteristics in 22 weed species of 12 families in Shenyang district.

Accumulative characteristics of heavy metals ( Cd, Pb, Cu and Zn) in 31 weed species belonging to 17 families which survived in a Pb.