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福建省主要中低产田土壤供钾能力研究
STUDIES ON THE POTASSIUM SUPPLYING ABILITY OF MAIN MEDIUM-LOW YIELD PADDY SOILS IN FUJIAN
【摘要】 本文着重以土壤化学分析、生物耗竭等方法,对全省主要中低产田类型耕层土壤典型样品143个,进行土壤钾素状况和不同土壤潜在性钾的释放速率以及黄泥田土壤钾素生物耗竭的研究,探讨土壤供钾能力及其与不同水稻品种吸钾之间的平衡关系。结果表明,丘陵山区中低产田土壤矿物性钾含量较丰富,而速效性钾缺乏,平均含量73.5ppmk,低于50ppmk的占总数的37.6%,不同土壤供钾力高低依次为滨海盐渍田>沙漏田>黄泥田>潜育性烂泥田,其供钾力强弱与水稻吸钾及其产量密切相关。
【Abstract】 1. The mean values of potassium contents from mediumlow yield paddy soils were 1.95% for total K. 215.6 ppm for slowly available k and 73.5 ppm for available K. The potassium contents in decreasing order were marine coastal salty paddy soil>sandy leak paddy soil >gleyed muddy paddy soil>yellow clayey paddy>soil. Indicating that the structural potassium of soil was rich while poor in available K. 2. The total amount of K separately extracted by INHNO3 seperately for 5 times from 4 main soils was significantly correlated to slowly available K r=0.972**. The rates of K-released to total K-extraction correlated signkficantly , r = 0.743*. The ability of potassium supply of different soils ranked as : coastal salty>sandy leak paddy soil and calcareous yellow clayed paddy soil>yellow clayed paddy soil>gleyed muddy paddy soil. 3. As the K-depletion of yellow paddy soils, the available K decreased sharply and simultaneously the rice yield dropped markedly, r=0.9219**. Total K oupply for 5 continual crops ( per pot ) were 1164 mg on more fertilizer gray-yillow paddy soil, out of which 89.0% came from available K, and 1047 mg on yellow paddy soil. Out of which 44.9% from available K. The former gave significantly high grain output than the latter by 51.5%.
- 【文献出处】 福建省农科院学报 , 编辑部邮箱 ,1990年02期
- 【被引频次】1
- 【下载频次】19