This article analyses the effect of the proportion of the different nitrogen forms on key enzyme activity of carbon and nitrogen metabolism under the condition
The narrow genetic base in potato (Solanum tuberosum L. ) limits the progress in cultivar development.The rich diploid germplasm in the origin center of potato
Chinese isolate of transmissible gastroenteritis virus(TGEV)was propagated and harvested in swine testicle (ST)cells. Two pairs of primers were designed accordi
This paper introduces a software specially in calculating the contribution rate of machanization in agriculture by usng economy math method ,computer technology