These changes are primarily relavant to the social transform and development,the influence of main culture to national culture and are sped up by TV popularizing,new technolg spreading and communication developing.
：The identity of Chinese Nation is consisted of three elements such as origin and development of the nationality, common country of the nations and the main culture of the country on the contemporary age.
After Confucian science was practiced as the only school in Han Dynasty, it became the main culture of China, Confucianism became one of the important strategies at that time to handle border problems.
According to the field systematic investigation on the 24 kinds of main culture medicinal plant diseases in Sichuan province,gathering the disease sample,observing the symptom and identifying pathogen,113 kinds of disease were identified,among them 25 kinds were domestic new records.
The main culture systems,such as traditional culture system,intesive sowing technique, inirrigated dry land culture technique and single stem culture technique of late sowing wheat are being applied,each of which can result in high yield of 500 to 600 kg per mu with proper application.
The main culture systems,such as traditional culture system,intesive sowing technique,inirrigated dry land culture technique and single stem culture technique of late sowing wheat are being applied,each of which can result in high yield of 500 to 600 kg per mu with proper application.
There are 3 main culture ways including common transplanting, seedling thown planting and derect sowing, which need different weeding control techniques because of the different symbiotic conditions caused by the planting ways.
In the main culture areas, production with existing techniques seems to have reached the system's carrying capacity.
This new method guarantees that giant nuclei of more than 90% of all sporophytes synchronously divide between 72 and 96?h after the transfer to the main culture (continuous white light of 12?W?m-2 in PES medium supplemented with 5?mM NaHCO3).
In order to optimize the culture results, we systematically studied the influence of main "culture conditions" such as tilt degree of the culturing palate, rotation speed, and addition of ascorbic acid to the medium.
A preliminary culture was carried out on clean sand in a cage with small holes in the bottom and then followed by a main culture on contaminated sand after the preliminary culture cage was placed upon a box filled with the contaminated sand.
The optimal profile of a physical variable of the preculture was determined which leads to an increasing output product concentration in the main culture of about 5%.