Floristic characteristics and ecological distribution of farmland weeds in Henan Province;

The kinds, distribution, harm and growing periods of farmland weeds in Qinhuangdao area were given on the spot investigation.

Twelve species of pathogenic fungi from the weeds in field in Guangdong province were found and described.

The paper presents the chevelopment in research and controlling of weeds in the fields of China,It mainly discusses the current problems and control tactics on weeds in the fields.

The micro-morphology of weeds (10 families, 22 species) seed testa, especially surface ripples ,was observed by the scanning electron microscope so as to compare the differences in different families , genera and species .

Two methods for drip irrigation scheduling for cash crop cultivation in greenhouses and small-scale farmlands are presented in this paper.

By sampling investigation on occurrence and prevention and cure condition of weeds of wheat in two districts,six counties and one city of Shangqiu,and carrying out scientific statistics,analyses and conclusion,we get the result of the category of occurrence weeds of wheat,the time of wheat s growing above the ground and the influential factors.