10.3389/fpls.2019.01358.s004
Moacir Tuzzin de Moraes
Moacir Tuzzin
de Moraes
Henrique Debiasi
Henrique
Debiasi
Julio Cezar Franchini
Julio Cezar
Franchini
João de Andrade Bonetti
João
de Andrade Bonetti
Renato Levien
Renato
Levien
Andrea Schnepf
Andrea
Schnepf
Daniel Leitner
Daniel
Leitner
DataSheet_4_Mechanical and Hydric Stress Effects on Maize Root System Development at Different Soil Compaction Levels.zip
Frontiers
2019
root growth modeling
drought stress
soil strength
soil physical limitation
Zea mays
2019-10-30 15:38:16
Dataset
https://frontiersin.figshare.com/articles/dataset/DataSheet_4_Mechanical_and_Hydric_Stress_Effects_on_Maize_Root_System_Development_at_Different_Soil_Compaction_Levels_zip/10082057
<p>Soil mechanical resistance, aeration, and water availability directly affect plant root growth. The objective of this work was to identify the contribution of mechanical and hydric stresses on maize root elongation, by modeling root growth while taking the dynamics of these stresses in an Oxisol into consideration. The maize crop was cultivated under four compaction levels (soil chiseling, no-tillage system, areas trafficked by a tractor, and trafficked by a harvester), and we present a new model, which allows to distinguish between mechanical and hydric stresses. Root length density profiles, soil bulk density, and soil water retention curves were determined for four compaction levels up to 50 cm in depth. Furthermore, grain yield and shoot biomass of maize were quantified. The new model described the mechanical and hydric stresses during maize growth with field data for the first time in maize crop. Simulations of root length density in 1D and 2D showed adequate agreement with the values measured under field conditions. Simulation makes it possible to identify the interaction between the soil physical conditions and maize root growth. Compared to the no-tillage system, grain yield was reduced due to compaction caused by harvester traffic and by soil chiseling. The root growth was reduced by the occurrence of mechanical and hydric stresses during the crop cycle, the principal stresses were mechanical in origin for areas with agricultural traffic, and water based in areas with soil chiseling. Including mechanical and hydric stresses in root growth models can help to predict future scenarios, and coupling soil biophysical models with weather, soil, and crop responses will help to improve agricultural management.</p>