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Effects of intercropping on field-scale phosphorus acquisition processes in a calcareous soil

机译：间断对钙质土壤尺度磷采集过程的影响

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Background and aims Calcium uptake by plants and the ratio of calcium to phosphorus (Ca/P) in the uptake have been recently identified as important drivers of P acquisition in neutral to alkaline soils. However, this has rarely been studied under field conditions and no data are available for the effects of intercropping. Methods Durum wheat and faba beans were cultivated, both as sole crops and as intercrops, in a P-deficient, calcareous soil over three consecutive growing seasons. We measured a range of plant, soil, and rhizosphere properties at the flowering stage and grain yield at harvest. Results Root dry weight, N fixation, rhizosphere acidification, the ratio of Ca/P in the uptake, and available P in the soil were all higher for faba beans intercropped with durum wheat. However, its growth was limited by other factors, probably including water availability. However, durum wheat growth and nutrient acquisition were markedly facilitated by intercropping with faba beans. The facilitation of P acquisition by durum wheat was caused by the acidification of its rhizosphere, the subsequently higher solubility of Ca-P minerals, and the lack of competition by faba beans for P. Conclusions The results confirm the importance of Ca uptake and the ratio of Ca/P in the uptake for P acquisition by plants in calcareous soils and, more specifically, for a cereal intercropped with faba beans.
机译：背景技术植物钙吸收和钙对磷（CA / P）的比例最近被确定为中性到碱性土壤中的P获取的重要驱动因素。然而，这很少在现场条件下进行研究，并且没有任何数据可用于间作的影响。方法培养杜兰姆小麦和豆豆，均以唯一的作物和作为跨性器，在P缺陷，连续三个生长季节的钙质土壤中。我们在开花阶段测量了一系列植物，土壤和根际特性和收获的谷物产量。结果根部干重，N固定，根际酸化，摄取中的Ca / P的比例，土壤中的可用P对Faba Bean与硬粒小麦的间作均高得多。然而，其增长受其他因素的限制，可能包括水可用性。然而，通过与Faba Beans的间作，杜兰麦小麦生长和营养收集明显促进。杜兰姆小麦P采集的促进是由其根际的酸化，随后对Ca-P矿物质的溶解度较高，以及对P的Faba Bean缺乏竞争。结论结果证实了CA吸收和比例的重要性CA / P在钙质土壤中P植物采集的摄取，更具体地说，谷物与Faba Beans的谷物间隙。

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