Study on Environmental Sensitivity of Rice Variety

Rice varieties can be divided into strong environmentally sensitive variety(ESV), weak environmentally sensitive variety(EWV) and environmentally insensitive variety(EIV)by environmental sensitivity of rice.The general method that was used to evaluate this environmental sensitivity(ES)of rice variety was put forward in this paper.ESs of varieties were evaluated as follows:(1)ES of indica japonica hybird rice(65002)was more sensitive than that of japonica rice;(2) The order of ESs of japonica type varieties was medium maturing late japonica varietyearly maturing late japonica varietylate maturing medium japonica varietymedium maturing medium japonica variety;(3) There was a significant difference in ESs among varieties of the same japonica type rice,too.Some problems,such as the principles of rather late maturing rice planting northward,were also discussed at the end of the paper.