ABSTRACT Plant nutrition practice in organic agricultural systems is sometimes reduced to a renunciation of applying readily soluble mineral fertilisers. In organic farming, however, soil nutrient stocks are regarded as an additional source of plant-available nutrients that can be mobilised by crop plants through rhizosphere effects. Therefore, unlike in conventional farming, the focus is not on replacement of the nutrients removed by the harvested products through readily soluble fertilisers enhancing nutrient concentrations in the soil solution. Instead, it is on minimising nutrient losses and supplying plant nutrients through soil-plant-microorganism interactions in which improved soil structure and enhanced soil biological activity facilitate plant-induced nutrient mobilisation and nutrient uptake under conditions of limited nutrient availability in the soil. This paper reviews these soil processes that improve the availability of macro- and micronutrients to plant roots under conditions of limited nutrient availability. It focuses on providing a conceptual framework for the different processes contributing to nutrient mobilisation and within which the various strategies for improving nutrient efficiency can be integrated in organically managed soils. Essential farm management options based on scientific views of nutrient dynamics to maintain soil fertility are addressed. With diverse, legume-based crop rotations with an adequate proportion of time dedicated to fertility building crops, careful management of manure and organic residues, and by using permitted inputs for phosphorus (P) and potassium (K), organic farms can be managed sustainably. However, efforts for recycling nutrients, mainly phosphorus, need to be enhanced.

中文翻译：

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有机和低投入农业系统中的土壤养分动态和植物诱导的养分动员：概念框架和相关性

摘要有机农业系统中的植物营养实践有时被简化为放弃使用易溶矿物肥料。然而，在有机农业中，土壤养分储量被视为植物可利用养分的额外来源，作物可以通过根际效应调动这些养分。因此，与传统农业不同，重点不是通过易溶肥料来替代收获产品去除的养分，从而提高土壤溶液中的养分浓度。反而，它是关于通过土壤-植物-微生物相互作用最大限度地减少养分损失和供应植物养分，在这种相互作用中，改善土壤结构和增强土壤生物活性，在土壤养分供应有限的情况下促进植物诱导的养分动员和养分吸收。本文回顾了这些土壤过程，这些过程在养分供应有限的情况下提高了植物根系的常量和微量营养素的可用性。它侧重于为促进养分动员的不同过程提供一个概念框架，并在其中可以将提高养分效率的各种策略整合到有机管理的土壤中。讨论了基于养分动态科学观点以保持土壤肥力的基本农场管理方案。与多样，以豆类为基础的轮作，有足够的时间专门用于提高作物的肥力，仔细管理粪便和有机残留物，并通过使用磷（P）和钾（K）的许可投入，可以可持续地管理有机农场。然而，需要加强回收养分（主要是磷）的努力。