种植密度和施肥量对甘薯新品种龙紫4号产量的影响

Effects of Planting Density and Fertilizer Amount on the Yield of New Sweet Potato Variety Longzi 4

[目的]研究甘薯新品种龙紫4号适宜的种植密度及施肥量,为加快新品种推广提供技术支持。[方法]采用单因素随机区组试验方法,探讨不同种植密度、施肥量对甘薯产量和薯块性状的影响。[结果]甘薯产量和大中薯数比例随种植密度提高先增加后降低,种植密度为5.25万株/hm2时甘薯产量最高(37.52 t/hm2)。薯单株薯重、大中薯重比例和单株结薯数随种植密度的提高而降低。甘薯产量、单株薯重、大中薯数比例随着施肥量的增加先提高后降低。施肥量为525 kg/hm2时,甘薯产量最高(38.78 t/hm2)。[结论]适当提高种植密度和施肥量能增加甘薯产量。种植密度为5.25万株/hm2、施肥量为525 kg/hm2时龙紫4号能取得高产。

[Objective] To research the high yield cultivation technique of new sweet potato variety Longzi 4,and to provide support for its extension. [Method]Single factor randomized block experiment was adopted to explore the effects of planting density and fertilizer amount on the yield and tuber traits of sweet potato. [Result] Fresh potato yield and the proportion of large and medium potatoes increased firstly and then reduced as the density enhanced. The highest yield was 37. 52 t / hm2 when density was 52 500 plants / hm2. The tuber weight per plant,Large and medium weight proportion,tuber number per plant decreased with the increase of planting density. Fresh tuber yield,tuber weight per plant and proportion of tuber number firstly increased,and then decreased with the increase of fertilizer amount. The highest yield of fresh potatoes was 38. 78 t / hm2 when fertilizer amount was 525 kg / hm2. [Conclusion]Enhancing density and fertilizer amount properly can improve the yield of sweet potato. High yield can be achieved under 52 500 plants / hm2 density and 525 kg / hm2 fertilizer amount.