This paper mainly studied the effects of different sowing dates and densities on the main agronomic traits and yield of Huayu 22 peanut under field conditions. The sowing date experiment obtained following results. (i) From April 25 to May 25, with the delay of the sowing date, the main stem height, the number of branches per plant, the number of pods per plant, full-seed pod rate and the yield decreased in Dongming test site, while...

In order to find out the difference in cadmium tolerance of different rice varieties in central Hunan, 26 varieties of conventional rice, two-line hybrid rice and three-line hybrid rice were used as materials. The effects of cadmium stress（0.5 mmol/L）on germination percentage, germination index, vigor index, root length, bud length and fresh weight of root buds of rice seeds were studied by indoor bioassay. The results showed that cadmium stress had little effect on seed germination...