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通过典型采样分析 ,研究侏罗纪沙溪庙组 (J2 s)、遂宁组 (J3s)、蓬莱镇组 (J3p)和白垩纪城墙岩群 (K1c)、夹关组 (K2 j)五种紫色土主要肥力要素的剖面分配特征。以黄壤作对比 ,对上述紫色土的肥力要素进行统计分析 ,评价紫色土的肥力状况与肥力潜力。结果表明 ,紫色土矿质养分含量高 ,土壤肥力高于黄壤 ;紫色土剖面有机质、N呈表土 >母质 >母岩的正向分异 ,P也基本表现正向分异的特点 ,紫色土全K表现逆向分异趋势。田间生物试验结果表明 ,富含未风化母岩(紫色页岩 )的紫色土玉米产量达到对照紫色土的 80 % ,土壤有机质及N素缺乏明显 ,施用有机质 (30 0 0 0kg/ha)和N (90kg/ha)、P (1 8kg/ha) ,玉米产量与熟化紫色土产量相当 ,表明紫色页岩是紫色土养分 (尤其钾 )补偿的重要而充足的库源 ,紫色土肥力潜力大 ,利用紫色页岩可快速培肥瘠薄紫色土。
By means of typical sampling analysis, the authors studied the effects of five kinds of purplish red jets on J2s, J3s, Penglaizhen Formation (J3p) and Cretaceous City Wall K1c, K2j Profile Distribution Features of Soil Main Fertility Elements. With the comparison of yellow soil, the fertility factors of purple soil were statistically analyzed to evaluate the fertility status and fertility potential of purple soil. The results showed that the purple soil had higher mineral nutrient content and higher soil fertility than the yellow soil. The organic matter in the purple soil profile, N was the positive differentiation of top soil> parent material> parent rock, and P also showed the positive differentiation. The performance of the trend of reverse differentiation. The results of field experiments showed that purple soil corn rich in non-weathering parent rock (purple shale) reached 80% of the control purple soil with obvious deficiency of organic matter and N, with organic matter (30 000kg / ha) and N (90kg / ha) and P (18kg / ha) respectively. The yield of corn is similar to that of matured purple soil, indicating that purple shale is an important and sufficient reservoir source for purple soil nutrients (especially potassium) The use of purple shale can quickly fertilize infertile purple soil.