当前位置： SCI文献检索 > ANNALS OF BOTANY期刊下所有文献 > Root system-based limits to agricultural productivity and efficiency: the farming systems context.

Root system-based limits to agricultural productivity and efficiency: the farming systems context.

Abstract：

:Background There has been renewed global interest in both genetic and management strategies to improve root system function in order to improve agricultural productivity and minimize environmental damage. Improving root system capture of water and nutrients is an obvious strategy, yet few studies consider the important interactions between the genetic improvements proposed, and crop management at a system scale that will influence likely success. Scope To exemplify these interactions, the contrasting cereal-based farming systems of Denmark and Australia were used, where the improved uptake of water and nitrogen from deeper soil layers has been proposed to improve productivity and environmental outcomes in both systems. The analysis showed that water and nitrogen availability, especially in deeper layers (>1 m), was significantly affected by the preceding crops and management, and likely to interact strongly with deeper rooting as a specific trait of interest. Conclusions In the semi-arid Australian environment, grain yield impacts from storage and uptake of water from depth (>1 m) could be influenced to a stronger degree by preceding crop choice (0·42 t ha-1), pre-crop fallow management (0·65 t ha-1) and sowing date (0·63 t ha-1) than by current genetic differences in rooting depth (0·36 t ha-1). Matching of deep-rooted genotypes to management provided the greatest improvements related to deep water capture. In the wetter environment of Denmark, reduced leaching of N was the focus. Here the amount of N moving below the root zone was also influenced by previous crop choice or cover crop management (effects up to 85 kg N ha-1) and wheat crop sowing date (up to 45 kg ha-1), effects which over-ride the effects of differences in rooting depth among genotypes. These examples highlight the need to understand the farming system context and important G × E × M interactions in studies on proposed genetic improvements to root systems for improved productivity or environmental outcomes.

journal_name

Ann Bot

journal_title

Annals of botany

authors

Thorup-Kristensen K,Kirkegaard J

doi

10.1093/aob/mcw122

subject

Has Abstract

pub_date

2016-10-01 00:00:00

pages

573-592

issue

eissn

0305-7364

issn

1095-8290

pii

mcw122

journal_volume

118

pub_type

杂志文章

在线工具

Root system-based limits to agricultural productivity and efficiency: the farming systems context.