Studies on the physiological and biochemical changes during curing process and harvesting methods of the main variety Xiaohuaqing of sun-cured red tobacco had been conducted in Fenghuang county of Hunan province from 2004 to 2005.

Experiments were conducted to study effects of different harvesting methods, maturity, numbers of leaves remained and languished time on nicotine, starch and chlorophyll content, economic properties and quality of K326, a variety of flue-cured tobacco, to improve the usability of upper leaves.

The influence of 3 different picking methods,including common picking method(T1),concentrated picking method(T2) and harvesting with stalk(T3),on the physiological index and quality of upper leaves during curing process was studied.

The comparison experiment between two plucking ways of cured tobacco 5～7 times (routine) and 3～4 times, was conducted for evaluating its quality and yield under the standard cultivated condition to look for the way which can reduce the input cost in production.

Production effect would be improved by selecting different production methods, thus it would raised by selecting rational production methods for improving the ultimate r.

Based on the study of the gas reserve scale and oil-gas distribution for ordinary heavy oil reservoir with gas cap of Cao 31 fault block in Lean oilfield, using reservoir engineering and numerical simulation, optimizing study on development technical limits for oil reservoir with small gas cap including production method, well pattern, waterflooding time is carried out.

Commentary of production method and numerical simulation of natural gas hydrates;