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浙江省主要丘陵旱地土壤的全钾量随母岩中长石和云母的含量增加而增加,幅度为0.57—3.13%,速效钾和缓效钾的含量分别为33—216ppm和80—638ppm,与土壤中高岭石及伊利石的相对含量有关。以化学试剂连续提取、电超滤(EUF)和强度/数量关系研究结果表明:高岭石为主的土壤,其缓冲容量(PBC~k)较低,有效钾数量较少,且缓效钾释放慢,在黑麦草耗竭试验中,经1—2次收获后,产量和吸钾量明显下降。以伊利石为主的土壤,其缓冲容量(PBC~k)高,黑麦草试验可得到连续的高产和吸取较多的钾。黑麦草试验还表明土壤的供钾特性较之其有效钾储量更有实践意义。
The total K content of soils in main hilly drylands of Zhejiang Province increased with the increase of the contents of feldspar and mica in mother rocks, ranging from 0.57 to 3.13%. The contents of available potassium and slow-acting potassium were 33-216ppm and 80-638ppm, respectively, Ridge and illite relative content. The results of continuous extraction with chemical reagents, electrofiltration (EUF) and the relationship between intensity and quantity show that kaolinite-based soils have lower buffering capacity (PBC-k), less available potassium, and slow-acting potassium Slow release, the ryegrass exhaustion test, after 1-2 harvest, yield and potassium absorption decreased significantly. In the illite-dominated soil, the buffer capacity (PBC-k) is high, and the ryegrass test can obtain continuous high yield and draw more potassium. The ryegrass test also showed that soil potassium supply is more practical than its available potassium reserves.