若干台灣農地土壤中鉀的量度-強度關係
Other Title
The Behavior of Potassium Q/I Relationship in Some Taiwan Soils
Journal
中國農業化學會誌
Journal Volume
36
Journal Issue
3
Pages
219-228
Date Issued
1998-06
Author(s)
林永鴻
洪崑煌
Yong-Hong Lin
Kung-Huang Houng
Abstract
土壤溶液中的鉀離子以及交換性鉀是植物可吸收利用之鉀的主要狀態，但其有效 性常受 Ca 及 Mg 離子的拮抗作用。 近來有些研究者提出用量度 -- 強度關係（ K Q/I relationship ）來評估鉀在土壤供應作物吸收的有效狀態， 是顧慮離子間交換競爭之影響 ，可能較為理想。 本試驗乃探討不同土壤的 Q/I 圖形並求其參數，以評估臺灣若干耕地土 壤中鉀的供應狀態。結果顯示：（ 1 ）土壤鉀的 Q/I 關係會因溶液中鈣濃度之高低而有不 同，反應鉀在粘土礦物表面之不同交換位置上，被鈣交換之難易程度。 （ 2 ）就鉀的供應 度強而言，牛尿港系及二林系土壤 AR °較高，其交換性鉀可能是粘土礦物平面上之交換位 置為主；柳營系、善化系及太康系三土壤則以結晶邊緣上的位置為主，其供應強度較低，當 對作物較不利。將軍系土壤則在低鈣濃度下，其鉀供應強度低，但在高鈣濃度下會提高供應 鉀的強度；平鎮系土壤則相反。（ 3 ）二林系土壤之鉀供應強度及緩衝能量均高，是屬於 供應鉀肥較好的土壤，牛尿港系土壤之鉀供應強度高，但其緩衝容量低，鉀肥之供應宜考慮 少量多次分施。太康系、柳營系及善化系土壤之鉀供應強度低，其緩衝容量卻大，要提高鉀 供應強度得大量施用鉀肥。將軍系及平鎮系土壤則鉀供應強度及鉀緩衝容量均比其它土壤來 的低，其管理較為不易。
Potassium ions in solution and in exchange complex are available to plants. However, K availability is affected by the antagonism of Ca and Mg ions. The K Quantity-Intensity relationship (K Q/I curve) has been suggested to describe the K availability in soil, taking into account of the competition between K ions and Ca and Mg ions for exchange sites on the soil exchange complex. In this experiment, we studied the Q/I plot of the soils and found the parameters can be used to evaluate the supply state of potassium. The results showed:(1) the K Q/I relationships of the five soils differed as the Ca concentration of the initial solution was varied. this phenomenon reflected different degrees of exchange of K by Ca on the exchangeable sites of the clay minerals, (2) the intensity of the potassium supply of Niuniaokang and Erlin soils possessed higher AR ° values, indicating that exchangeable K in these soils were primarily on the plannar surfaces of the clay particles; while those of the Liuying, Shanhua and Taikang series were primarily on the crystal edge surfaces and were less favorable to the plant. The K supply intensity of Chiangjung soil was low when the Ca concentration was low, but it increased when the Ca concentration was high., and the K supplying intensity of Pinchen soil was the opposite, (3) the K supply intensity of Niuniaokang soil was high, but its PBC (K buffer capacity) was low, therefore it is suggested that the K application be split into small doses to maintain a high K supplying intensity. The K supply intensity of Liuying soil is low, but its PBC is large, so it is expected that a large amount of K fertilizers would be needed to increase the K supply intensity to more favorable level. The supply intensity and the buffering capacity of the Chiangjun and Pinchen soils were low, and K management in these soils would be more difficult.
Subjects
鉀供應強度
鉀緩衝容量
鉀鈣活度比
鉀量度-強度(Q/I)關係
K supplying intensity
K buffer capacity
PBC
K-Ca activity ratio
K-Q/I relationship
Publisher
中國農業化學會
Type
journal article