in Africa (extremely hot and dry, followed by torrential rains), the ploughing
method of farming combined with the climate conditions has led to large
scale soil erosion. The loss of top soil as well as soil nutrients and trees,
means that, eventually, the soil cannot produce any crops. The loss of trees
causes further soil erosion and loss of shade.
Zero tillage is
labour intensive and utilises hand held hoes to create individual seed stations
thereby ensuring a minimum of soil disturbance.
Top soil is not lost and waste products from crop growing are allowed to remain
in the soil, encouraging the development of nutrients. There is
large scale unemployment in Africa, so labour intensive methods of working like
this project are encouraged. So, a family can provide enough food for themselves
and some to sell to enable them to buy grain for the next season. The impressive
crop yields on zero tillage plots more than justify the method.