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不同施钾处理对棉田土壤钾素形态与土壤肥力的影响 预览 被引量:4

Effects of Different K Fertilizer Treatments on Soil K Forms and Soil Fertility in Cotton
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摘要 选取长江流域棉区2个土壤肥力不同的试验地点,研究施钾量与施钾时期对棉田土壤钾素形态与土壤肥力的影响。结果表明:随一次性基施钾量的增加,2个试验点土壤水溶性钾、非特殊吸附钾、特殊吸附钾和缓效钾含量均显著增加,矿物钾含量变化不显著;土壤速效氮和速效磷含量降低,土壤有机质、全氮与全磷含量没有明显变化。增施钾肥促进土壤脲酶、转化酶和磷酸酶活性提高,但高钾处理(300kgK2O/hm^2)显著抑制其活性,施钾对过氧化氢酶活性没有影响。施钾显著提高植株钾素累积量、生物量及皮棉产量。在150kgK2O/hm^2施钾量下,分期施钾处理(50%基施+50%初花期追施)的土壤养分、酶活性以及皮棉产量均与一次性基施处理没有显著差异;而在300kgK2O/hm^2施钾量下,分期施钾处理各项指标均显著高于一次性基施。2个试验点均以基施150kgK2O/hm^2+追施150kgK2O/hm^2处理土壤肥力与棉花产量最高。 Two sites with different soil fertility in cotton region in Yangtze river basin were chosen to study the effects of potassium application rate and time on the soil K forms and soil fertility in cotton. The results showed that with the increasing of basal K application rate, the contents of water-soluble K, non-specifically adsorbed K, specifically adsorbed K and slowly available K increased significantly in two sites, but the con- tent of mineral K did not change significantly; the contents of available N and available P decreased, but the contents of organic matter, total N and total P did not change significantly; the application of K improved the soil urease, phosphatase and invertase activities, but high K (300 kg K2O/hm^2) decreased enzyme activities and the application of K had no effect on hydrogen peroxidase activity. The plant K accumulation, the total biomass and the lint yield increased significantly with the increasing of K application rate. When the K appli- cation rate was 150 kg K2O/hm^2 , there were no significant differences of soil nutrient, enzyme activities and the lint yield between the split application of K (50% basal applied and 50% top-dressed at the beginning of flowering ) and the basal application, but when the K application rate was 300 kg K2O/hm^2 , the indices of the split application of K were superior to ones of the basal application. For the two sites, the treatment of 150 kg K2O/hm^2 basal-applied and 150 kg K2O/hm^2 top-dressed showed the highest cotton yield and soil fertility.
作者 刘丽平 孟亚利 杨佳蒴 胡伟 周治国 LIU Li-ping, MENG Ya-li, YANG Jia-shuo, HU Wei, ZHOU Zhi-guo (Key Laboratory of Crop Growth Regulation of the Ministry of Agriculture, Agronomy College of Nanjing Agricultural University, Nanjing 210095)
出处 《水土保持学报》 CSCD 北大核心 2014年第2期138-142,共5页 Journal of Soil and Water Conservation
基金 公益性行业(农业)科研专项“主要农作物高产高效生理基础及栽培新技术研究与应用” 国家自然科学基金(31071363)
关键词 施钾量 施钾时期 土壤钾素 土壤肥力 棉花 K application rate K application time soil K soil fertility cotton
作者简介 刘丽平(1987-),女,在读硕士,主要从事作物生理生态方面的研究。E-mail:2011101056@niau.edu.cn 通讯作者:周治国(1964-),男,教授,博士生导师,主要从事作物生理生态、信息技术方面的研究。E-mail:giscott@njau.edu.cn
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