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近年来,被认为“富钾”的北方地区陆续出现了一些施钾增产的报道。为了明确甘肃省土壤钾肥的动态变化及作物对钾肥的反应,我们于1993～1994年开展了钾肥肥效的研究,为平衡施钾提供科学依据。 一、甘肃省土壤钾素状况 1993年对全省13个地市42个县主要土类305个耕层(0～20cm)土样的分析发现,我省土壤缓效钾(K)的含量在352～1770mg/kg之间,平均1052mg/kg,大部分样点在700mg/kg以上。土壤速效钾含
In recent years, there have been some reports of increasing potassium production in the northern areas, which are considered to be “rich in potassium.” In order to clarify the dynamic changes of soil potash fertilizer and the response of crops to potash fertilizer in Gansu Province, we conducted a study on the fertilizer efficiency of potash fertilizer from 1993 to 1994 to provide a scientific basis for the balanced application of potassium fertilizer. Soil potassium status in Gansu Province In 1993, the soil samples of 305 tillage layers (0 ~ 20cm) in 42 major counties of 13 cities in Hunan Province were analyzed. The results showed that the content of potassium (K) 352 ~ 1770mg / kg, an average of 1052mg / kg, most of the sample at 700mg / kg or more. Soil available potassium