多效唑对无土栽培马铃薯微型种薯的生长和产量的影响

用多效唑（ＰＰ＿（３３３））的５个浓度在无土栽培生产马铃薯微型种薯的植株上进行了叶面喷施（３次）试验。结果表明，２０ｍｇ／Ｌ的ＰＰ＿（３３３），就可对马铃薯无土栽培的盘苗植株起抑制作用，其作用随浓度增高而增强，到４０ｍｇ／Ｌ浓度还未停止，作用仍在增强。对盘苗微薯块茎产量的提高，要到３０ｍｇ／Ｌ才起作用，以３５ｍｇ／Ｌ浓度的效果最佳。

Effect of PP_(333)on the Growthand Minituber Yield of Soilless Cultured Potato

The experiments of spraying PP_(333) solution three times with five different con-centrations on soilless cultured potato leaves were carried out.The results showed that theinhibition effect on potato soilless cultured plant growth was observed by spraying 20 mg/LPP_(333),the effect increased with the concentration of PP_(333) and not stopped up to 40 mg/L;theeffect however,on increasing the minituber yield was observed by spraying 30 mg/L PP_(333)and 35 mg/L PP_(333) had the best result.