| 湖南省主要旱地土壤供钾能力的研究 |
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| 引用本文： | 郑圣先,李明德.湖南省主要旱地土壤供钾能力的研究[J].中国农业科学,1995,28(2):43-50. |
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| 作者姓名： | 郑圣先 李明德 |
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| 作者单位： | 湖南省农业科学院土壤肥料研究所，长沙 410125 加拿大钾磷研究所 |
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| 摘 要： | 通过对土壤的粘土矿物、含钾矿物、钾素含量状况和供钾特性进行分析，阐明了湖南省主要旱地土壤的供钾能力。土壤全钾、缓效钾和速效钾的含量分别为1.44%-2.75%、160.4-479.5mg/kg和61.9-114.2mg/kg、钾素含量与母质、粘土矿物组成和含钾矿物的含量有关。研究表明，以高岭石为主的土壤，其缓冲容量较低，钾释放速率小，在耗竭试验中，经4-5次收获后，玉米的干物质产量和吸钾量明显下降，田间施钾效果极为显著。以伊利石为主的土壤，其缓冲容量大，耗竭过程中玉米可得到持续高产和吸取较多的钾，田间施钾效果不明显。在湖南省主要旱地土壤上，除紫色页岩和湖积物发育的旱土供钾能力较高外，其它母质发育的旱土都表现出缺钾。
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| 关 键 词： | 供钾能力 粘土矿物 含钾矿物 钾素含量 |
POTASSIUM SUPPLMNG CAPACITY OF MAIN UPLAND SOIL IN HUNAN PROVINCE |
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| Zheng Shengxian,Li Mingde,Dai Pingan,Sam Portch.POTASSIUM SUPPLMNG CAPACITY OF MAIN UPLAND SOIL IN HUNAN PROVINCE[J].Scientia Agricultura Sinica,1995,28(2):43-50. |
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| Authors: | Zheng Shengxian Li Mingde Dai Pingan Sam Portch |
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| Abstract: | Total potassium(K), slowly available K and available K were determined in main upland soils of Hunan province. A laboratery study on quantity-intensity (Q/I) relationships, release and fixation of soil K were conducted for eight representative upland soils from the Province Potassium supplying capacity of the soils were evaluated. Response to K fertilizer using corn as indicator plant under greenhouse and field conditions were studied. Fonns of K were correlated with crop response to native and applied K.Research results indicated that purple calcareous clayey soil derived from purplish shale and purple calcareous soil derived from lacustrine deposite contained dominantly clay mineral with illite and mica, the content of K bearing mineral ranged from27.35%-29.28%,with upland soils derived from other parent material contained dominantly clay mineral with kaolinite and the content of K bearing mineral ranged only from 19.99%-23.25%.Total K, slowly available K and available K of main upland soils in Hunan province ranged from 1.44%-2.75%,160.4-475.ppm and 61.9 114.2ppm, respectively.K contents were slightly higher in Hunan upland soil than in paddy soil.The response of corm to K fertilizer on purple calcareous clayey soil and purple calcareous soil were not significant due to the high potassium content and higher potential buffer capacities, the response of corn to K fertilizer on yellow clayey soil was significant.However,the responses of corn to K fertilizer on other soils were very significant due to their low K content and the small potential buffer capacities of the soils. |
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| Keywords: | Potassium supplying capacity Clay minerals K-bearing mineral Potassinm content |
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