小麦根际溶钾细菌对小麦生长和吸收钾素的影响

为了考察小麦根际亲和性溶钾细菌对小麦生长和小麦钾肥利用的影响,采用盆栽法栽培小麦,测定小麦干物质积累、叶片含钾量、土壤速效钾含量,考察溶钾细菌对小麦地上部分植株钾素积累量和钾肥利用率的影响。结果显示,11株溶钾细菌接种处理使小麦地上部分干重超过施100%钾肥的对照CK2的水平,WS25和WS27处理的小麦干物质积累极显著高于CK2,分别比CK2高11.66%和23.34%;在小麦苗期,11株溶钾细菌处理的小麦根干重和小麦植株钾素积累量均高于CK2;在旺长期,11株溶钾细菌处理的植株钾积累量均高于施50%钾肥的CK1,3株菌(WS25、WS27、WS28)处理的小麦植株钾素积累量高于CK2,其中WS27极显著高于CK2;11株溶钾细菌处理的钾肥利用率均高于CK1和CK2,其中WS27使得小麦的钾肥利用率在苗期和旺长期分别比CK2高出17%和40%。溶钾细菌可以促进小麦植株对土壤中钾素的吸收和利用,提高肥料利用率,促进小麦植株的生长和发育。

Wheat potassium-releasing bacteria influence the growth and potassium absorption of wheat seedlings

The aim of this paper was to investigate the influence of wheat potassium releasing bacteria on growth and potassium absorption of wheat seedlings. The effects of 11 strains on seedlings potassium accumulation and the recovery efficiency (RE) of potassium fertilizer were evaluated by investigating the dry matter accumulation of wheat seedlings and soil available potassium content with a pot experiment. As results, the shoot dry weight treated with 11 strains was higher than that of the control group (CK2) with 100 % potassium fertilizer application. The shoot dry weight of the wheat seedlings treated with WS25 or WS27 was 11.6 % and 23.34 % higher, respectively than that of CK2. At the seedling stage, both root dry weight and seedlings potassium accumulation in plants treated with 11 strains were higher than that of CK2. At the vigorous growing stage, the potassium accumulation in seedlings treated with 11 strains was higher than that of CK1 (the control group with 50 % potassium fertilizer application). Three strains (WS25, WS27 and WS28) promoted seedling potassium accumulation compared with that of CK2, especially strain WS27 significantly promoted the seedlings potassium accumulation. The recovery efficiencies of all soils treated with 11 strains were higher than that of CK1 and CK2, and the values treated with WS27 were significantly higher than those of CK2, increasing by 17 % and 40 % at the seedling stage and in vigorous growing stage, respectively. A pot experiment showed that wheat potassium releasing bacteria tested in this research can promote the potassium absorption, the recovery efficiency (RE) of potassium fertilizer and wheat growth.