In order to meet the modernization industrial seeding for vegetables and the development need of many automatically equipments,a directional precision seeding mechanism for big seeds,making the long axis direction of pumpkins keep in consistent,has been designed,providing the protection for the cotyledons direction of the entire seedlings keep in consistent.

In the study,the whole seeds was taken as CK1,the half-seeds without sand cover as CK2 and the other half-seeds vere covered with the 1cm,2cm,3cm and 4cm thick layers of sand,respectively.