不同复合肥施用量对木薯幼苗生长及肥料利用效率的影响

Different amount of compound fertilizer on cassava seedling growth and effects of fertilizer utilization efficiency

以木薯(Manihot esculenta Crantz)品种华南205自然杂交种子为试验材料,通过盆栽试验,研究复合肥施用量(0~30 g/盆,折算后为0~4.246 t/hm2)施用量对木薯幼苗生长及肥料利用效率的影响。结果表明,施用复合肥能加快木薯幼苗出土,促进幼苗生长,增加幼苗氮、磷、钾含量和积累量;随着施用量的变化,木薯幼苗的根系生长显著增加。苗木地径、茎高、干物质积累量、苗期质量指数和植株氮、磷、钾积累量和养分利用率均先增加后减小,肥料氮、磷、钾养分利用率则显著下降。其中复合肥(N∶P2O5∶K2O=28∶6∶6)施用量10 g/盆(折算后为1.415 t/hm2)的综合效应最好。

Taking cassava(Manihot esculenta Crantz) varieties South China 205 natural hybrid seeds as the experimental material,through pot experiment,research applying compound content(0~30 g/pots,rates of 0~4.246 t/hm2) seems to cassava seedling growth and the influence of the fertilizer use efficiency.The results showed that the application of compound fertilizer could accelerate the excavation of cassava seedlings,promote the growth of seedlings,and increase the content and accumulation of N,P and K of seedlings.Change with dosage,root growth of cassava seedlings increased significantly.Seedling ground diameter,stem height,dry matter accumulation,seedling quality index and plant N,P,K accumulation and nutrient use efficiency were increased after the first decreases,and fertilizer N,P,K nutrient utilization rate had dropped significantly.Among them,the comprehensive effect of compound fertilizer(N∶P2 O5∶K2 O=28∶6∶6) was the best when applied at10 g/pot(1.415 t/hm2 after conversion).