Effects of different ridging mode and applying potassium fertilizer at different stages on chromoplast pigment and its degraded products in flue-cured tobacco leaves;

During 2005-2006,a field experiment was employed to study the relationship between the contents of polyphenols and petroleum ether extracts and different ridging mode and method of applying potassium fertilizer using a tobacco(Nicotiana tobacum L.

A study was carried out on the effects of different ridging mode and applying potassium fertilizer at different stages on the contents of potassium and leaf quality of flue-cured tobacco(Nicotiana tobacum L.

Effects of different ridging mode and the methods of applying potassium fertilizer on the contents of aroma components in flue-cured tobacco;

Improved design of locally compacted ridge-furrow fertilizing machine;

Low efficiency brought about by buyer monopoly, and relevant costs transferred to consumer are at least double or more.

This paper studies the employment effect of minimum wages in the monopsony labor market.

The paper tries to analysis the measure methods of monopsony in the theory of Industrial Organization,and classifies the measure methods of monopsony to species:SCP formulas and its extend,and NEIO method as well as its extend.

Backward integration is the main characteristic of administrative monopsony enterp.