摘要
通过盆栽试验研究了施氮水平和不同品种水稻对四川盆地 3种典型紫色水稻土 5种钾形态的影响以及各种土壤钾形态对水稻钾素营养的贡献。结果表明 ,4个紫色水稻土供钾能力均属中下水平 ,全钾含量为 1 2 9%～ 2 62 % ,其中矿物钾量平均占 96 82 % ,速效钾和非交换性钾仅平均占 0 62 %和 2 56% ,土壤供钾能力以中性紫色水稻土 >石灰性紫色水稻土 >酸性紫色水稻土。施氮 (N 0～ 150mg/kg)促进 4个紫色水稻土钾素的释放 ,提高水稻对非交换性钾和矿物钾的吸收利用 ,使矿物钾和非交换性钾的贡献占植株吸钾的 80 3% ,速效钾仅为 19 7%。中性紫色土供试 4个品种水稻的吸钾能力为开优 5号 >汕优 63>Ⅱ优 60 78>引佳 1号。施氮后4个品种水稻吸自非交换性钾和矿物钾量平均占植物吸钾量的 66 9% ,以施中氮 (N 150mg/kg)时植株吸钾量最高 ;
Pot experiment was adopted to study the effects of nitrogen supplying levels and rice cultivars on five forms of soil K in three purple paddy soils in Sichuan basin. Results indicated that the total K in the tested purple paddy soils was low to medium ranged from 1 29% to 2 62%, and mineral K accounted for 96 82% while quickly availble K and slowly available K only accounted for 0 62% and 2 56%, respectively on average. The potassium supplying power of the tested soils showed the following order neutral purple paddy soil>calcareous purple paddy soil>acid purple paddy soil. Nitrogen application(0～150mg/kg) increased the release of soil potassium and the utilization of non exchangeable K and mineral K. In accordance with the total amount of net K uptake by rice, the contribution of non exchangeable K and mineral K accounted for 80 3%. The capability of potassium uptake by four rice cultivars was Kaiyou 5>Shanyou 63>Eryou 6078>Ying jia 1 in neutral purple soil. Contibution of non exchangeable K and mineral K to K uptake by four rice cultivars accouted for 66 9% after the application of nitrogen fertilizer on average. The maximun of net K uptake by four rice cultivars were obtained at medium nitrogen level (N 150mg/kg). It was not beneficial to the K uptake by rice and the release of soil mineral K at low or high nitrogen level.
出处
《植物营养与肥料学报》
CAS
CSCD
2000年第4期389-396,共8页
Journal of Plant Nutrition and Fertilizers
关键词
氮肥
水稻
紫色水稻土
钾形态
nitrogen fertilizer
rice cultivar
purple paddy soil
form of potassium
