In the last few years, vegetable industry developed rapidly in Hebei province, intensive raising seedling as its main component, also entered a period of rapid development. The background and characteristics, the current situation and existed questions of intensive seedling cultivation were...

We introduce the stratified sampling method, and put forward theoretical unbiased estimation of stratified sampling program, as well as the model and statistics of experimental design test. We also discuss the establishment of dietary exposure model, pollutant distribution model, and risk...

In order to set up the digitization indices system of appearance quality of flue-cured tobacco leaves in Qujing. According to the relevant standards, the quantitative analysis on appearance quality of 39 central and upper tobacco samples which were collected from eight flue-cured tobacco...

With the popularization of the Internet, this technology has changed the form of information dissemination. The information will spread quickly when food product harm crisis happens, and the phenomenon that information of product-harm spills over is very common. This article is based on...

According to the characteristics of agricultural system in Beijing, Tianjin and Hebei, population pressure, resource utilization and construction capability are taken as the first grade indices. And There are a total of 14 second grade indices, such as the per capita cultivated land, per capita...