The preliminary study on the floods and droughts in Zhejiang during the reign of Chongzhen;

The constant floods and droughts in the Yangtze and Huaihe river area during the Ming and Qing dynasties had resulted from the combined action of many elements.

This article use the Marxist materialist conception of history and probe into the relationship between floods and droughts and agro-farming in Jianghuai of China in Ming and Qing dynasties, with the visual angle of social economic history of calamity.

This paper analyzes the characteristic and cause of drought and flood disaster in Shaanxi Province, forecasts the future tendency of the flood and drought disaster, gives the general understanding and comprehensive prevention countermeasure for the disaster, and provides essential gist for both flood and drought prevention and damage control plan of Shaanxi Province .

are analyzed Basic characteristic of hydrologic situation and rule of flood and drought disaster occurring in Shanxi province are generally reflected.

Immpacts of flood and drought disasters on society economy and countermeasures in Liaoning Province;

The preliminary study on flood and drought in Shanxi Province and their impacts on foodstuff production;

In the great development,it is necessary and urgent to protect and to improve ecological environment,and to reduce the losses caused by flood and drought disasters.

Nutrient management strategy of paddy rice-upland crop rotation system;

The current status of nutrient management and strategy in paddy rice-upland crop rotation in southwest China;