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在黄褐土和砂姜黑土上进行了 KCl施用量 (0、75、15 0、2 2 5、30 0 kg/ hm2 )与土壤速效钾增量和缓效钾增量关系的土培试验。结果表明 :KCl施用量与土壤速效钾增量及缓效钾增量之间均存在着极显著的线性正相关。KCl施用量产生的土壤速效钾增量 ,砂姜黑土 >黄褐土 ,水培 >旱培 ;在砂姜黑土上 ,旱培的缓效钾增量明显大于水培。经计算推测两种土壤的缓效钾 (K)“中等”指标值为 5 0 0 mg/ kg。本研究对测土施钾具有一定的指导作用
Soil culture experiments were carried out on yellow cinnamon soil and sago lime black soil in the relationship between KCl application rate (0,75,15 0,2,25,30 0 kg / hm2) and soil available potassium increment and slow-acting potassium increment. The results showed that there was a significant linear positive correlation between the amount of KCl applied and the increment of soil available K and increment of slowly available K. KCl application rate of soil available potassium increment, Shajiang black soil> yellow cinnamon soil, hydroponic> dry culture; in Shajiang black soil, slow-acting cultivated slow-available potassium increment was significantly larger than hydroponics. It is estimated that the slow-acting potassium (K) “medium” index for both soils is 500 mg / kg. The study of soil testing of potassium has a guiding role