Its a good idea at your age to learn more about pensions in general and think about your own position.
Have you analysed your current pension plan and worked out how the farm is going to pay you a salary from retirement age until you die, which hopefully will be 20 years ?
You ask about whether company pension plans are "safe". Do you mean safe form collapsing and everyone losing everynhting, or safe from losing some value over time ?
You should read up on the company pension plan you have been offered, it is probably a good idea.
Are your employers going to pay into the pension plan for you, as well as you paying a contribution. you need to read the documentation to find this out.
This is a complete guess, just to illustrate to you the advantages of a company pension,
Lets say that you earn 30k and the pension plan is employees contibutions is 4% and the employers is 6%. This is a guess, but fairly typical of a lot of schemes.
Out of your €2500 gross monthly salary, you pay €100 into pension and your employer will pay €150. If you did not make this contribution, you would get approx €50 extra in your pay packet. Instead you get €250 invested in a pension. Company pension plans are at risk of the stock market falling, but it will be invested for 30 years and the stock market will go up and down over that time.