We compare the minute structures of several different kinds of rice stem and analyze the relationship between its minute structure and mechanical property.

In order to evaluate the differences of rice-stem lodging resistance between controlled irrigation and regular irrigation,and seek irrigation treatment which was beneficial to rice stem lodging resistance,rice-stem was taken as the research object,and the performance of rice-stem lodging resistance was studied under different irrigation treatments.

10 restorer lines and 7 male-sterile lines were studied on lodging resistance to rice and the relationship between lodging index and culm traits with lodging index.

Genetic studies were conducted on the number of spikelet per panicle (NSPP) and the culm traits in three line indica hybrid rice, by using genetic models for additive dominant additive×additive epistasis including genotype×enviroment (GE) interaction.

The best scheme of extracting soluble sugar from Camptotheca acuminata Decne leaves is A 3 C 2 B 3 :solvent volume 60ml, extracting temperature 80 ℃ and extracting time 60 min; while the best scheme of extractin.

The result of an experiment, which contrasted the content of soluble sugar and Vitamin C in crops near cement factories and the cleaning regions in Xingtan, Hunan Province, showed that the nutrition contented in vegetables near the cement factory is reduced.