Experimental Studies on Characteristics of Combined Arrangement of Drawing and Rotary Tillage Implements and its Technique of Saving Energy and Prevention of Soil Contamination

为了降低起垄作业的燃料消耗，建立起垄作业降低NO_3-N污染的技术，对新型起垄系统（包括打垄）和传统起垄系统进行了试验研究，结果表明：在起垄效果相同的情况下，新型起垄系统所需的总功率约为传统起垄系统的0.6 ~ 0.7倍;新型起垄方式在具体工作量上具有上级优势，与传统起垄方式相比，挖掘垄面的方法更能显示出适宜的土壤蓄水量。试验结果表明，在甘薯生长季节，特别是雨季，这种新型的起垄系统能有效地控制水分入渗。割垄地NO_3-N的迁移和滞留明显。结果表明，与常规起垄相比，起垄表面轻敲处理的土壤入渗量明显降低。综上所述，新起垄方式有助于减少NO_3-N淋失，总体上新起垄方式优于传统起垄方式，但传统起垄方式在联合耕作机理上具有上级优势。

Experiments were performed by using the new method of ridging system that included tapping the surface of ridge and by using the conventional ridging.Our objective in this study was to reduce the fuel consumption and to establish the technique reducing NO_3-N pollution.The characteristics of the new method of ridging system were summarized as follows :Fo the same ridging effect, the total power requirement in the new ridging system was about 0.6 - 0.7 times as large as that in the conventional ridging. And the new ridging system was superior on the specific work done.The method of tapping the surface of ridge tended to show suitable soil water storage than the conventional ridging. This newly developed ridging system was found to be more effective in controling infiltration in sweet potato production during growing season, especially as rainy season. And it was obvious that NO_3-N did not move and stayd in the tapping ridge plot. It was found that treatment by tapping the surface of ridge was lower infiltration from surface to subsoil than coventional ridging plot. As described above, it was found that the new method of ridging system contributed to reduce NO_3-N leaching.In conclusion, the performance of the new method of ridging system was generally for better than that using the conventional ridging, but the conventional ridging was superior on the conbined tillage mechanism.