| 1 | The result showed: the soil nitrogen in soil was low. It was deficiency seriously and not balanced in Danzhou; | |
| 2 | The antagonistic strain Bacillus subtilis B68 was screened from banana plantation in Danzhou, Hainan province. | |
| 3 | In this paper the actuality of the nitrogen element in 2061 soil samples from 17 townships in Danzhou city of Hainan province was analyzed. | |
| 4 | Based on the investigation to the Xiqing State Farm in Danzhou, Hainan Island, this paper analyzed the influence of cold stress on the natural rubber and put forward some relevant suggestions. |
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