In recent years phosphorus application methods have become an important management strategy for optimising the uptake of the immobile nutrient phosphorus (P). Root system architecture (RSA) could play a particularly important role in the uptake of P by grain legumes, due to their relatively coarse root systems. The objective of this study was to understand the response of mungbean root systems to P application methods. Four mungbean varieties were grown in purpose-built soil filled root chambers that received five P application methods. Phosphorus treatments consisted of a control (no application of P) compared with 30 mg P/kg soil throughout the soil volume (high P treatment) or restricted to 10cm deep layers in the topsoil or in a layer from 20-30cm deep. A fifth treatment consisted of the same amount of P as applied in deeper dispersed layer applied in a concentrated band at 25cm depth. After 50 days of growth, plant were destructively harvested and shoot and root parameters were measured. Mungbean varieties responded differently to P application methods, with Jade and Berken varieties showing greater root proliferation at depth and greater shoot growth in response to banded and deeper dispersed P applications, relative to the late maturing variety Putland. Shallow dispersed P and the no-P control both resulted in poor root growth in all the genotypes except Celera II, which did not respond to P application from any placement strategy. Results suggest that P application strategies may need to vary with variety to maximize the uptake of P.
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机译：近年来，磷应用方法已成为优化固定营养磷（P）的吸收的重要管理策略。由于其相对粗的根系，根系系统架构（RSA）可以在P由谷物豆类的摄取中发挥特别重要的作用。本研究的目的是了解Mungbean根系对P应用方法的反应。在专用土壤填充的根腔内生长了四种汞型品种，接受了五种P施用方法。磷治疗包括对照（不施用P），与30mg P / Kg土壤相比，整个土壤体积（高P治疗）或仅限于2-30厘米深的10cm深层或深度深度。第五处理包括在施加在浓缩带中的更深的分散层中的相同量的p，在25cm深度施加在浓缩带中。经过50天的生长后，植物被破坏性地收获并测量芽和根参数。 Mungbean品种对P应用方法的反应不同，玉器和贝尔肯品种相对于晚期成熟品种普兰德，玉器和贝尔克伦品种呈现深度和更大的枝条生长，响应于带状和更深的分散的P应用。浅分散的P和NO-P控制均导致Celera II的所有基因型中的根系生长较差，这与任何放置策略没有响应P应用。结果表明，P应用策略可能需要随多种而变化，以最大限度地提高P.
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