Effect of uniconazole application on the yield of sweetpotato,the residue in soil and the growth of wheat in the wheat-sweetpotato cropping system
A field experiment was conducted to investigate the effect of uniconazole application including both foliar spraying and root drip irrigation on the yield of sweetpotato,the residue of uniconazole in soil and the growth of sub-sequent wheat at the initial enlargement stage of sweetpotato.The results showed that uniconazole treatment could inhibit aboveground growth and promote the expansion of the tuberous root in sweetpotato,among which the effect of foliar spraying was higher than that of root drip irrigation.No residue of uniconazole was detected at the level of 0.1 mg/kg by high performance liquid chromatography(HPLC)in all the samples,indicating that the concentration of uniconazole residue in soil was lower than 0.1 mg/kg.However,it was found by biological effect testing of post-stubble soil that the soil treated with a dose higher than 10 g/666.7 m2 had a certain adverse effect on the subsequent wheat growth,among which that of drip irrigation was higher than foliar spray at the corresponding sample.The wheat plant height and yield decreased significantly with the delay of application and increase of dose through the field experiment of subsequent wheat.The results showed that uniconazole was a relatively safe and low residual plant growth regulator,the use of which should be applied safely by spraying under an effective dose of 10 g/666.7 m2 about 67 days after sweetpotato planting.
sweetpotatouniconazoleyieldfoliar spraydrip irrigationresidue in soilwheat
万方数据
维普
