Abstract Zinc deficiency is an extended agronomic problem, particularly in staple food crops such as cereals. The availability of Zn to plants is ruled by soil properties, biological factors in the rhizosphere, and interaction with other nutrients. These factors may constrain the predictive value of Zn availability indices. This work aimed at assessing the soil factors that affect the absorption of Zn by plants and improving the predictive value of conventional indices. To this end, an experiment was performed using durum wheat (Triticum durum L.) grown on a set of soils developed under Mediterranean climate. In calcareous soils, Zn uptake by plants decreased with increased clay content and Olsen P (POlsen), meanwhile in non-calcareous soils it decreased with increased crystalline Fe oxides content. Biological factors such as microbial activity and organic anion exudation in the rhizosphere contribute to Zn uptake by plants. No relationship was found between Zn uptake by plants and the DTPA extractable Zn (ZnDTPA). Pyrophosphate extractable Zn (ZnPyro) was only related to Zn uptake by plants in calcareous soils (R2 = 0.29; P

中文翻译：

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决定地中海气候下土壤中锌有效性和植物吸收的因素

摘要 缺锌是一个长期存在的农艺问题，特别是在谷物等主粮作物中。锌对植物的可用性受土壤性质、根际生物因素以及与其他养分的相互作用的影响。这些因素可能会限制锌可用性指数的预测值。本工作旨在评估影响植物吸收锌的土壤因素，提高常规指标的预测价值。为此，使用生长在地中海气候下形成的一组土壤上的硬粒小麦（Triticum durum L.）进行了一项实验。在钙质土壤中，植物对锌的吸收随着粘土含量和奥尔森磷 (POlsen) 含量的增加而减少，而在非钙质土壤中，随着结晶铁氧化物含量的增加，锌吸收量减少。根际微生物活动和有机阴离子渗出等生物因素有助于植物吸收锌。未发现植物对锌的吸收与 DTPA 可提取锌 (ZnDTPA) 之间存在关系。焦磷酸盐可萃取锌 (ZnPyro) 仅与钙质土壤中植物对锌的吸收有关 (R2 = 0.29; P