Correlation degree analysis and gray clustering evaluation on performance indices of wheat no-tillage planter

No-tillage planting is one of the most important assignments of the conservation tillage technology. In order to select suitable soil-surface conditions for implementing the conservation tillage technology in north China, the planting experiment on field using the 2BMF-9 wheat no-tillage planter were carried out on eight kinds of surface treatments, then various performance indices, emergence of seeding rate and tiller number were obtained on each surface treatment. The grey correlation analysis showed that the seeding uniformity, covering soil ability and passing ability had greatly influenced on the emergence of seeding rate and tiller number. Eight kinds of surface treatments were categorized with the principle of gray clustering evaluation, the results indicated that the no-tillage planter could directly sow on the plots that straw mulching quantity were between 3 000 and 3 750 kg/hm2, and stubble height below 25 cm, if stubble were smashed, sowing quality would be better. The plot, that straw mulching quantity were around 4 500 kg/hm2, must be smashed. To reduce the straw coverage, the plot, that straw mulching quantity was more than 5 250 kg/ hm2, should be smashed (such as shallow spining, shallow harrowing and shallow plowing) before planting on surface.