不同施磷量对鲜食型甘薯产量及磷素吸收的影响

Effects of Phosphorus Levels on Storage Root Yield and Phosphorus Uptake of Sweetpotato for Table Use

采用田间试验的方法,设置了6个磷水平(0、37.5、75.0、112.5、150.0、187.5kg/hm2),研究不同施磷量对鲜食型甘薯产量、干物质积累和磷素积累的影响。结果表明,施磷能够显著增加甘薯产量并提高商品薯率,当施磷量为P2O5112.5kg/hm2时增产幅度最大。施磷水平对甘薯干物质积累与分配有显著影响,在甘薯各生长时期施磷条件下块根干物质积累量和积累速率整体上均显著高于不施磷处理(P<0.05),同时施磷还提高了地下部干物质分配比率,促进了块根产量的形成。施用磷肥可以显著提高甘薯对磷素的积累,随着施磷量的增加,甘薯植株的磷积累量呈现增加趋势。

A field experiment was conducted to study the effects of different phosphorus application rates on storage root yield, dry matter （ DM ） accumulation and P uptake of sweetpotato for table use under six phosphorus levels （0, 37.5,75.0,112.5,150.0,187.5kg/hm^2 ）. The results obtained as follows： the phosphorus could significantly increase the storage root yield and marketing tuber rate, the increasing in yield reached the highest at the rate of 112.5kg P2O5/hm^2. P application rate could also affect the DM accumulation and distribution of sweetpotato during the entire growing season. P application treatments made the DM accumulation amount, rate and distribution ratio of storage root to be remarkably higher than control （P 〈 0.05 ）. P application promoted P accumulation of sweetpotato, and the P accumulation amount increased with the increase of P application rate.