钾肥、覆膜对马铃薯硒素吸收分配及硒肥吸收率的影响

Effect of potassium fertilizer and film-covered on absorption rate of selenium fertilizer and the selenium absorption and distribution of potato

采用田间试验方法研究了钾肥及覆膜对马铃薯硒素吸收分配的影响。结果表明:地膜覆盖及钾肥的施用提高了收获期马铃薯全株及块茎干物质产量;钾肥的施用显著提高马铃薯全株及块茎硒素含量与吸收累积量。钾肥与硒肥配合施用,使块茎硒素含量达0.148 mg.kg-1的富硒水平,对块茎硒素的富集有正交互效应,使收获期全株硒肥吸收率达17.8%,比单施硒肥提高1.5个百分点,块茎硒肥吸收率7.1%,提高2.7个百分点。覆膜对马铃薯全株、块茎硒含量及全株硒素吸收量无显著影响,但可显著提高块茎硒素累积量。覆膜硒肥配合,收获期全株硒肥吸收率20.0%,提高2.2个百分点,块茎硒肥吸收率10.1%,提高3.1个百分点。覆膜可显著促进硒素在体内由茎叶向块茎的转移。收获期,覆膜硒素运转率53%,提高10.1个百分点。

The field experiments were carried out to study the effect of film-covered and potassium fertilizer on absorption rate of Se fertilizer and Se absorption and distribution of potato（ZiHuabai）.The experimental results were as follows：The yield of whole plant and tuber were improved evidently by film-covered and potassium fertilizer.Meanwhile,Applying potassium improved se concentration and accumulation in whole plant and tuber.potassium and selenium make the Se-contents of tuber come to Se-enrichded level at 0.148 mg·kg-1.The interaction was positive effect.In harvest stage,the absorption rate of Se in whole plant and tuber was respectively increased by 1.5 and 2.7 percentage point than potassium alone.Se-concents in whole plant and tuber and accumulation in whole plant were distinct effect by film-covered,but accumulation in tuber increased evidently.In harvest,the absorption rate of Se in whole plant and tuber was respectively increased by 2.2 and 3.1 percentage point through Se fertilizer and film-covered.Film-covered improved significantly Se to translate from stem and leave to tuber.In harvest stage,the translocation rate of film-covered was 53 percent,which increased 10.1 percentage point.