【摘要】 用电超滤（EUF）法预测湖北省48种水稻土供钾状况的研究表明,EUF法0—35分钟解吸土壤钾量与耗竭盆栽试验水稻吸钾量、1mol NH₄OAC化学提取钾量之间都有极紧密相关,其直线和关系数（r）分别为0.7596和0.6576,均达到极显著水准。EUF法0—35分钟解吸钾量与盆栽NP、NPK处理水稻干重百分比值（以NP/NPK×100%表示）之间也有紧密相关,其相关回归方程为y=41.60X^0.1889,相关系数（r）=0.3415,达到显著水准.以EUF法的自5—10分钟解吸钾量（AB）与30—35分钟解吸钾量（CD）的AB/CD比值大小,反映着湖北省各地水稻土均有不同程度的固钾能力,以鄂南、鄂东南水稻土固钾能力相对较小,鄂北、鄂西北较大,这与其粘土矿物的组成、数量及土壤质地有关。利用EUF法可确定湖北省水稻土到达“最低水平”时交换钾的含量即“最低水平值”,这对恰当地评价1mol NH₄OAC法所测得的土壤钾量具有实际意义。原土壤以1 mol NH₄OAC法测得的钾量与土壤达到“最低水平值”时的差值（暂称可利用钾量）和EUF法测定值之间有紧密相关,其直线相关系数（r）为0.7340,达到极显著水准。更多还原

【Abstract】 By using method measuring EUF, potassium amounts uptaken by rice successive ex hausted pot cultivation and 1mol NH₄OAC chemical method for estimating potassium-supplying state of Forty-eight paddy soils in Hubei province, the result show: the potassium uptaken by rice successive exhausted pot cultivation and lmol NH₄OAC chemical extracted method is closely correlated with the EUF （0-35 min. ） method. The relationship between amounts of all measured, which coefficient（r）of linear corretation has reached highly significant level.The between measured values of EUF method with NP and NPK tretmeuts（on the basis of NP/NPK×100% to rice dry matter）is closely correlated too, which coefficient （r） of linear correlation reached significant level.The amoants of potassium deabsorption for EUF method of 5-10 min, and 30-35 rain, are AB and CD.respectively, which AB/CD ratio shows different degreet of fixed potassiam power for paddy soil in Habei province. The fixed potassium power of paddy soil in southdand southeast of Hubei province is relatively less, but the north and northwest of Hubei province is more, which has Something to do with composition and quantity of clay mineals of soils, as well as soil terture.The EUFmethod may define"the lowest levelvalue"for lmol NH₄OAC extracted potassium for paddy soil,It is very pesy practical to rightly adopt method of lmol NH₄OAC which is widely used to determine potassium amounts. The measuring potassium amount of soils and the differential value of soil when reaching the lowest level value （called available potassium） is closely correlated with determined value by EUF-method, which coefficient（r） of linear correlation can reach highly significant level.更多还原