磷施用量对红壤中玉米生长的影响

摘要

[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/hm2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/hm2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/hm2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/hm2.%[Objective]The suitable phosphate fertilizer rates on corn in red soil were discussed.[Method]A pot experiment was conducted to in-vestigate the effects of different phosphorous fertilizer rates(0,60,120,180,240 kg/hm2 ) 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 application rate was 120 kg/hm2 .It could improve corn biomass accumulation and plant phosphorous when the phosphorous fertilizer rates were 120 kg/hm2 and 180 kg/hm2 .It was found that soil total phosphorus and soil available phosphorus were increased with increas-ing the phosphorous fertilizer.[Conclusion]Applying 120 kg/hm2 phosphorus fertilizer is the most rational dosage.