Prasad N R, Pagel H
Beitr Trop Landwirtsch Veterinarmed. 1976;14(1):79-87.
The determination of the content of available molybdenum in 196 soil samples from different geographical (Yemen, Sudan, Tanzania, Ghana, Cuba, and Sri Lanka) and climatic (annual precipitation 30-3000 mm) regions gave these results: 1. Arid and subarid soils of dry regions as well as rendzina-type soils contained the highest amount of available molybdenum (0.216 ppm respectively). The lowest content was determined in the ferrallitic soils of the humid tropics (0.045 ppm). These differences are mainly attributed to high pH values and CaCO3 content in aridisols and rendzina-type soils and to a strongly acid soil reaction in ferrallitic soils. 2. The content of available molybdenum was significantly positively correlated with the pH, percentage base saturation, CEC and exchangeable Ca; it was negatively correlated with the clay content. 3. Deficiency of molybdenum is hardly to be expected in arid and subarid soils (24 per cent of all samples deficient). The proportion of samples with a low Mo content and the probability of Mo deficiency increases in this order: vertisols (40%) leads to fersiallitic soils (64%) leads to ferallitic soils (89%).
对来自不同地理区域（也门、苏丹、坦桑尼亚、加纳、古巴和斯里兰卡）以及不同气候区域（年降水量30 - 3000毫米）的196份土壤样本中有效钼含量的测定得出了以下结果：1. 干旱地区的干旱和半干旱土壤以及黑色石灰土型土壤中有效钼含量最高（分别为0.216 ppm）。在湿润热带的铁铝土中测定出的含量最低（0.045 ppm）。这些差异主要归因于干旱土和黑色石灰土型土壤中的高pH值和碳酸钙含量，以及铁铝土中强烈的酸性土壤反应。2. 有效钼含量与pH值、碱基饱和度百分比、阳离子交换量和可交换钙显著正相关；与粘土含量负相关。3. 在干旱和半干旱土壤中几乎不太可能出现钼缺乏情况（所有样本中有24%缺乏钼）。钼含量低的样本比例以及钼缺乏的可能性按以下顺序增加：变性土（40%）、铁铝土（64%）、铁铝土（89%）。
