The article took and tested 62 samples of top soil(0-20 cm) from potato growing areas in Wuxi and Chengkou of Chongqing for learning the status about potato soil nutrient.The results showed that,the soil pH was unsuitable for growing potato as overall alkaline.The soil organic matter was rich,where the content over 20 g/kg took up 80.6% and there was 17.7% soil over 40 g/kg.The rate of soil total nitrogen and total phosphorus were high respectively and total potassium nearly a half of the whole samples was moderate,the ratio of richness and lack were 24.2% and 30.6%.As for one area,the contents of total phosphorus and total potassium were both serious lack reached 35.3% and 50% in Wuxi.The results also indicated that,the content of soil available N,P,K and S were all in rich levels and the exchanged Ca and Mg were both extremely rich.The standard of soil available S was generally low in Chengkou.In terms of the micro-nutrients,the deficiency rate of available Fe,Mn and B was 48.4%,56.4% and 98.4%,respectively.However,the rate of available Cu and Zn were both very rich.All the micro-nutrients were higher in Chengkou.Soil nutrient classifications differed significantly at different positions and different region by the experiment.

在重庆市巫溪和城口两县采用大田试验研究了不同中微量元素肥料对马铃薯产量和品质的影响.结果表明,两个地点试验均以增施锌肥和锰镁硼锌复合肥可显著提高马铃薯产量,其余各种肥料的增产作用因试验地点不同其效果各异;增施锰、硼肥提高了马铃薯维生素C含量,而增施镁、锌肥则降低维生素C含量;增施各中微量元素(锰除外)肥料均不同程度地提高了马铃薯的淀粉含量;各种中微肥对马铃薯可溶性糖、粗蛋白含量的影响在两个试验点的结果差异较大.除增施锌的处理外,其余各处理均不同程度的降低了两试验点马铃薯的磷含量;除增施锰和锌的处理外,其余各处理均不同程度的降低了两试验点马铃薯的钾含量.增施各中微量元素肥料,提高了马铃薯土壤的养分含量,改善土壤肥力水平.

The effects of different fertilizer combinations on yield and quality and content of available macronutrient in the soil of potato was carried out.The results indicated that compared to the conventional fertilization,soil conditioner and organic manure based on formula fertilization could raise the yield of potato17.7% and 12.9% respectively.The content of vitamin C in potato was raised to 9.2%,9.6% and 9.2% respectively in the formula fertilizer,soil conditioner and secondary and microelement fertilizer treatments based on formula fertilizer as compared with the conventional fertilization.The contents of starch,crude protein and phosphorus were increased by 10.5%-13.0%,21.5%-40.8% and 3.5%-27.2% respectively in all formula fertilizer treatments.The soluble sugar of potatoes was reduced 14.1% and 5.6% by formula fertilization and soil conditioner based on formula fertilization respectively.The content of potassium in potato was enhanced by 7.0% and 10.9% respectively in the organic manure and soil conditioner treatments based on formula fertilization.Application of secondary and microelements fertilizers,organic fertilizers and soil conditioner could increase the content of organic matter and available macronutrient in the soil,and improve soil fertility.