赤红壤旱地钾素的生物耗竭

The bio-exhausting experiment of Potassium in the Upland field of Lateritic Red Soil

盆栽试验赤红壤在连续种植条件下 ,钾素耗竭处理的生物产量迅速下降 ,土壤供钾水平陡降至“最低值” ,表明赤红壤钾素耐耗竭的能力较弱 ,该能力与缓效钾的释放有关。研究还显示 ,赤红壤钾素耗竭的负效应远大于水稻土 ,对补充钾素的需要更为迫切 。

Pot experiment of continuous planting was carried out for researching potassium biological exhaustion in the lateritic red soil. The results indicate that the biomass of exhaustion treatment rapidly decreased, and soil potassium supply level fall suddenly to the lowest value. It shows that lateritic red soil has weak patience ability to potassium exhaustion, which was related with slow-release available potassium. The results also indicate that the opposite effect of exhausting potassium in the lateritic red soil was very larger than that of rice soil, so it is more urgent to replenish potassium for the former.