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为了研究在施用不同量牛粪后土壤-甜高粱体系中钾元素的利用和分布情况,试验分析了牛粪、甜高粱及土壤试验前后速效钾、全钾含量和甜高粱产量。结果表明:试验前在最浅层(0～≤5 cm)土壤中速效钾含量极显著低于>5～≤10 cm、>10～≤15 cm、>15～≤20 cm土层(P<0.01),4个土层土壤钾含量分别为27.73,43.27,42.97,40.40 mg/kg;试验后各土壤层全钾、速效钾含量与试验前相比均有增加;不同施肥处理对甜高粱速效钾含量的影响不显著(P>0.05);施化肥组甜高粱总产量极显著高于其他各组(P<0.01);钾元素在植株茎叶及根系中的富集作用表现为茎叶>根系。说明单施有机肥不是最佳施肥方式,需要有机肥、无机肥混合施入。
In order to study the utilization and distribution of potassium in the soil-sweet sorghum system after applying different amounts of cow dung, the available potassium, total potassium and sweet sorghum yield of cow dung, sweet sorghum and soil before and after the experiment were analyzed. The results showed that the content of available potassium in the shallowest layer (0 ~ ≤5 cm) before the experiment was significantly lower than that in> 5 ~ ≤10 cm,> 10 ~ ≤15 cm,> 15 ~ ≤20 cm soil layer (P < 0.01). The contents of potassium in four soils were 27.73, 43.27, 42.97 and 40.40 mg / kg, respectively. After treatment, the content of total potassium and available potassium in soil layers increased compared with those before the experiment. The effects of different fertilization treatments on sweet sorghum (P> 0.05). The total yield of sweet sorghum in chemical fertilizers group was significantly higher than that in other groups (P <0.01). The enrichment of potassium in plant stems, leaves and roots showed that stems and leaves> Root system. Explain single application of organic fertilizer is not the best way to fertilize, need organic fertilizer, inorganic fertilizer mixed into.