腐殖酸对丹参干物质积累与养分利用的影响

利用盆栽试验,比较了腐殖酸不同用量下丹参干物质积累、氮磷钾养分的吸收与利用效率的差异。结果表明,适宜腐殖酸用量能够促进丹参的干物质积累与分配,增加根/冠比,提高丹参产量。腐殖酸施用增加了土壤容重,过高的土壤容重不利于丹参生产,1.262～1.265 g/cm3的土壤容重有利于丹参生长。腐殖酸适量施用增加了丹参根与地上部的氮、磷养分含量,但降低了钾素含量,而大用量具有提高钾含量的趋势;适量的腐殖酸施用能够提高丹参对氮、磷素的利用率而降低了钾素利用率,但较大用量则降低了氮、磷、钾素利用率。

Effects of Humic Acid on Dry Matter Accumulation and Nutrient Utilization of Salvia Miltiorrhiza

The differences in dry matter accumulation,absorption and utilization of nitrogen,potassium and phosphorus of Salvia Miltiorrhiza Bge were analyzed under different application amount of humic acid by pot experiment.The results showed that the appropriate amount of humic acid could promote the accumulation and distribution of dry matter,increase the root/shoot ratio and yield of Salvia Miltiorrhiza.The application of humic acid could increase soil bulk density,but excess soil bulk density disadvantaged Salvia Miltiorrhiza growth.The soil bulk density within 1.262~1.265 g/cm3 advantaged Salvia Miltiorrhiza growth.The appropriate application of humic acid increased the contents of nitrogen and phosphorus in Salvia Miltiorrhiza root and shoot,but decreased the potassium content.Large amount of humic acid had a trend of increasing the potassium content.Appropriate amount of humic acid could increase the use efficiency of nitrogen and phosphorus and decrease that of potassium,but they were decreased by large amount of humic acid.