No.

Source

Influence factors

(1)

Nature and environment

Weather mutation

Pests & diseases

Soil environment incompatibility

(2)

Market and supply

Mechanical failure

Machine aging

Incompatibility between agronomy and machine

Operation order increasing

Operation order cancelation

Operation area change

Operation location change

Operation sequence change

Operation time change

Operation quality change

Operation price change

Operation duration change

Driver illness

Operation skill defects

Material supply

(3)

Customer and behavior

Miscommunication

Customer barrier

Unprofessional operation

Mechanical maintenance delay

(4)

Society and economy

Government compulsory policy

Government fine

Farm machinery subsidies change

Unfair competition

(5)

Others

Accident of road transportation

Lost on the road

Field location inaccurate