论文部分内容阅读
紫色水稻土全钾含量属中等水平，速效钾属中等偏下水平，土壤对钾素的供应总体不足。作物吸收的钾，矿物钾占76.95％，速效钾和缓效钾仅占10.81％和12.24％。土壤矿物钾释放随时间的延长逐渐下降，随土壤颗粒粒径的下降显著增大，在80分钟时，释放量仍高达08～8.8mg·kg-1.min-1，80分钟内的累积释放量为土壤缓效钾的1.5～2.0倍;土壤速效钾的形成随时间的延长逐渐趋向稳定。不同土壤矿物钾的释放顺序和土壤速效钾形成顺序的不一致性，是由它们的机理和土壤性状综合造成的，但是，Elovich方程都能较好地拟合土壤矿物钾的释放过程和土壤速效钾的形态过程，方程参数b值能反映过程进行的速度。
The total potassium content of purple paddy soil is middle level, while the available potassium is middle-lower level. The total supply of soil potassium to the soil is insufficient. Potassium absorbed by crops, mineral potassium accounted for 76.95%, available potassium and slow-acting potassium accounted for only 10.81% and 12.24%. The release of potassium from soil minerals decreased gradually with the time increasing, with the decrease of particle size of soil significantly increasing. At 80 minutes, the release was still up to 08-8.8 mg · kg-1.min-1 in 80 minutes The amount of available potassium was 1.5-2.0 times that of soil. The formation of soil available potassium gradually stabilized with time. However, the Elovich equation can well fit the release process of soil mineral potassium and the available potassium in soils, and the order of K release from different soil minerals is inconsistent with the sequence of soil available potassium formation. Morphological process, the value of the equation parameter b can reflect the speed of the process.