After listing the assumptions of the model, we built the model for distribution system with multi-source and multi-product based on time constraints.

In this article, we discuss the questions around following aspects: 1) germplasm resources and its value; 2) germplasm resources crisis; 3) germplasm resources protection management and techniques; 4) key questions and research focuses in the field,etc.

2 liter to adapt small quantity of sample in the field of crop germplasm resources research and crop breeding.

Crop germplasm resources are an important component part of biodiversity and are the material base of agricultural development.

Factor analysis was perpformed for 28 traits of 201 Maize variety resources in Hubei Province.

in this article,the authors have outlined the present cultivation state and habitat condition of chinese fir i Hubei province,they also discribed the tree s variety resource .

A series of local variety resources of Amorphophalluskonjac collected from northern part of Sichuan basin were planted, observed, and identified in the outskirts of Mianyang.

Based on revisions of some progress of molecular marker,propagation ability and improvement by hybridization in the study of goat variety resources,four proposals for study and utilization of goat variety resources were suggested.

The variance and path analysis indicated that all classes of pea have the differences in nature, The utilize potential of the pea variety resources was put forward.

Analysis and evaluation on main nutrition compositions of sweet potato germplasm;

Analysis of SSR Fingerprints in Part of the Silkworm Germplasm Resources;

Analysis of potato germplasm resources in Yunnan province by RAPD;