磷施用量对红壤中玉米生长的影响

Effect of Phosphorus Fertilizer Rates on Corn Growth in Red Soil

[目的]探讨红壤上玉米适宜的磷肥施用量。[方法]通过盆栽试验,研究了0、60、120、180、240 kg/hm^2磷肥施用量对玉米生长、养分积累及红壤中全磷和有效磷含量变化的影响。[结果]磷肥施用量为120 kg/hm^2时,红壤中玉米株高、茎粗均优于其他处理,磷肥施用量为120、180 kg/hm^2时促进玉米生物量的积累,提高植株磷养分含量。土壤有效磷含量和全磷含量随着磷肥施用量的增加而增加。[结论]红壤中玉米的适宜磷用量为120 kg/hm^2。

[ Objective ] The suitable phosphate fertilizer rates on corn in red soil were discussed. [ Method ] A pot experiment was conducted to investigate the effects of different phosphorous fertilizer rates （0,60,120,180,240 kg/hm^2 ） on the maize growth, nutrient accumulation, soil total phosphorus and soil available phosphorus in red soil. [ Result ] The maize height and stem diameter were superior to other treatments when the phosphate fertilizer appllcatitm rate was 20 kg/hm：, h could improe corn hlomass accumulation and plant phosphorous when the phosphorous fertilizer rates were 120 kg/hm^2 and 180 kg/hm^2. It was found that soil total phosphorus and soil available phosphorus were increased with increasing the phosphorous fertilizer. [ Conclusion] Applying 120 kg/hm^2 phosphorus fertilizer is the most rational dosage.