[目的]探讨桂中蔗区甘蔗磷肥施用效应,为当地甘蔗生产合理施用磷肥提供理论依据.[方法]采用不同施磷量处理在广西来宾市兴宾区进行田间试验,设4个施磷量处理(P0、P1、P2、P3),对应磷肥用量分别为0、59.925、119.850、179.775 kg/ha (P2,O5),研究不同处理对甘蔗生长性状的影响,并计算各处理的磷肥农学效率.[结果]施用磷肥处理甘蔗分蘖期、伸长初期、工艺成熟期均能明显提高甘蔗的长势,与不施磷肥处理相比,施磷处理的有效茎数、茎径、产量分别提高6.48％、6.67％和8.70％；P1、P2和P3的磷肥农学利用效率分别为14.51％、10.82％和8.31％.当磷肥施用量超过119.850 kg/ha(P2O5)时,甘蔗单茎重与磷肥农学效率均随着施肥量的继续增加而降低.[结论]从甘蔗增产效果以及肥料资源高效利用等综合考虑,桂中蔗区甘蔗磷肥的合理施用量为119.850 kg/ha( P2O5).%[Objective]Effects of phosphorous fertilization on sugarcane production were investigated in central Cuangxi to rationalize the application of phosphorous fertilizer in sugarcane fields. [Method]Field experiments were conducted using four different levels of phosphorous fertilizer treatments, viz., Po (0 kg/ha), P1 (59.925 kg/ha), P2(119.850 kg/ha), P3 (179.775 kg/ha) to observe their effects on sugarcane growth characteristics in Xingbin District of Guangxi. In addition to this, their agronomic efficiency was also calculated. [Result]At tillering, elongation and maturity stages, the application of phosphorous fertilizer significantly boosted the growth vigor of sugarcane. On an average, effective stem number,stem diameter and yield of sugarcane were increased by 6.48, 6.67 and 8.70%, respectively, under different fertilization treatment compared to Po (no fertilizer). Agronomic efficiency of phosphorus fertilizer in treatment P1, P2, P3 was 14.51, 10.82 and 8.31%, respectively. Once exceeding 119.850 kg/ha (P2O5), single stalk weight and agronomic efficiency of phosphorus fertilizer declined with increasing fertilizer dose. [Conclusion]Considering sugarcane yield and effective use of fertilizer, the viable dose of phosphorus fertilizer should be 119.850 kg/ha (P2O5) for central Guangxi areas.
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