As every one know, The same field needs to feed more and more people. the number of the people grow up quickly , the pressure to produce more food from the field is more heavily. 

So people put more and more chemical fertilizers to the field, of coure some of the fertilizers help plants produce more food , from seasons , from years. Some fertilizers left into soil , and made the soil harden, only little passageway , little air , little water can get inside soil particles.

How to "soft " the hardened soil ? how to active and reuse the left fertilizers in the soil ? to change the bad factor to a useful , good factor ? 

may we find out a right way ?

We think it is a problem with value , 

Please share your opinion with us ,   please send email to info@profirst.cn

thank you ,