According to the requirement of using rice seedling throwing to plant rice and under the condition of using nutrition earthen bowl to raise rice with the geometric simulation principle, the fine-seeding machine was designed　and studied.

Design and Experiment on Pressure-plate and clamping precision dibbler

Analysis of the population guality of wheat sown through precise surface seeding;

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.

The paper deals with the advantages and the importance of the corn precision seeding technology through analysis of some tests; it also expounds the key technology in the process of the machinery precision seeding.