营养型土壤改良剂对酸性土壤中钾的调节及玉米吸钾量的影响

营养型土壤改良剂(以下简称改良剂)施入三种不同肥力水平的土壤进行恒温培养试验和盆栽试验,测定土壤有效钾的含量、盆栽试验玉米的生物量和钾吸收量。结果表明:对于有效钾含量高的土壤,改良剂能促进钾的缓效化,有利于土壤钾的保蓄,防止土壤钾的淋失;对于有效钾含量较低的土壤,改良剂可以活化土壤中的钾,提高土壤钾的有效性;不同肥力水平的土壤,改良剂都能促进玉米对钾的吸收,有利于提高钾肥的吸收利用效率。

Effect of nutritive soil modifier on potassium activation and uptake by corn plants in acid soils

In the present study, nutritive soil modifier (hereinafter abbreviated as NSM) was applied to three kinds of acid soils with different characters. An indoor soil incubation experiment was conducted and a greenhouse soil pot experiment was conducted with corn plants(Zea mays L.). The major results showed,when the native potassium content in the soil was high , NSM could improve potassium adsorbed and prevent potassium from losing; when the native K content in the soil was lower, NSM could activate potassium and increase potassium availability in the soil; NSM could improve the nutrient environment of soil hence to increase the uptake efficiency for potassium, leading to a better growth of the maize plants.