Review: Environmental biology and crop improvement

Area of Science:

• Agricultural Science
• Plant Biology
• Ecology

Background:

• Wheat yields in Australia have significantly increased over the past decade.
• Environmental factors, particularly root diseases and nutrition, were key drivers of this yield improvement.
• Historically, water availability was less limiting than crop health and nutrition.

Purpose of the Study:

• To analyze the environmental biology driving recent advances in Australian wheat yields.
• To understand the shift in yield-limiting factors from nutrition/health to water use efficiency.
• To identify future avenues for enhancing wheat production through breeding and agronomy.

Main Methods:

• Analysis of historical yield data and environmental factors influencing Australian wheat production.
• Evaluation of the impact of improved inoculum management for root diseases.
• Assessment of the role of nitrogen fertilization in enhancing crop responsiveness.
• Examination of water use efficiency in wheat production.

Main Results:

• Wheat yields increased at an unprecedented rate, driven by ecological and nutritional improvements.
• Effective management of root diseases and increased nitrogen fertilization led to healthier, higher-yielding crops.
• Water is becoming a more significant yield-limiting factor as health and nutrition improve.
• Enhanced water use efficiency is crucial for future yield gains.

Conclusions:

• Improvements in crop health and nutrition have been pivotal for increasing Australian wheat yields.
• Future yield gains will depend on continued breeding progress and advanced agronomic practices focusing on water use efficiency and root-soil interactions.
• Understanding subsoil resource access and spatial yield variation is key for further advancements.