Abstract
Abstract Effects of soil compaction stress were investigated in maize hybrids subjected to low (L‐1.10), medium (M‐1.30) and high (H‐1.60 g/cm 3 ) soil compaction. The hybrids selected for the study differed in their susceptibility to growth under soil compaction stress conditions. We used appropriate methods of non‐destructive cleaning and analysis of all intact compartments of the root system. Petrolatum–wax test, proved as an effective screening technique for selecting resistant and sensitive maize hybrids, was also employed. The seedlings were grown in custom‐made ‘root‐box’ and ‘root‐basket’ containers. The penetration resistance (PR) strength of 0.52 and 1.07 MPa was satisfactory for estimating root penetration index (RPA) among maize hybrids. The soil compaction stress affected root system structure (RSS) in maize hybrids. The resistant hybrids showed a lower decrease in root dry matter (DM) in M and H treatments at 0.0–15 cm soil depth, and an increase in the number of roots growing at an angle of 0°–30° in relation to the main growth axis, comparing to sensitive hybrids. The soil compaction stress lowered root number (R N ) and length (R L ), shoot and root DM, and increased shoot to root ratio (S/R). The changes were greater in sensitive than in resistant hybrids. In addition, a regression coefficient (R 2 ) between stress susceptibility index (SSI) and relative trace change (RTC) marked for changes in dry matter of shoot (S), roots (R), shoot to root (S/R) ratio and root length (R L ) and number R N was statistically significant. Seedlings of maize single‐cross hybrids demonstrated differences in their responses to soil compaction stress, which caused changes in shoot and root dry matter and the distribution of roots in the soil profile.
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Claims 8
Claim · model-written summary
Soil compaction stress lowered root number and root length in maize.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of soil compaction stress were investigated in maize hybrids”
e1“The soil compaction stress lowered root number (R N ) and length (R L )”
Claim · model-written summary
Soil compaction stress lowered shoot and root dry matter in maize.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of soil compaction stress were investigated in maize hybrids”
e2“The soil compaction stress lowered root number (R N ) and length (R L ), shoot and root DM”
Claim · model-written summary
Soil compaction stress increased the shoot to root ratio in maize.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of soil compaction stress were investigated in maize hybrids”
e1“The soil compaction stress lowered root number (R N ) and length (R L )”
e3“increased shoot to root ratio (S/R)”
Claim · model-written summary
Changes caused by soil compaction stress were greater in sensitive than in resistant maize hybrids.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of soil compaction stress were investigated in maize hybrids”
e1“The soil compaction stress lowered root number (R N ) and length (R L )”
e4“The changes were greater in sensitive than in resistant hybrids”
Claim · model-written summary
Resistant maize hybrids showed a lower decrease in root dry matter under medium and high compaction than sensitive hybrids.
- Material
- resistant hybridse5
- Treatment
- M and H treatmentse5
- Outcome
- root dry matter (DM)e5
- Direction
- lower decreasee5
- Qualifier
- 0.0–15 cm soil depthe5
- Comparator
- sensitive hybridse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of soil compaction stress were investigated in maize hybrids”
e5“The resistant hybrids showed a lower decrease in root dry matter (DM) in M and H treatments at 0.0–15 cm soil depth”
e6“comparing to sensitive hybrids”
Claim · model-written summary
Resistant maize hybrids showed an increase in the number of roots growing at an angle of 0°–30° to the main axis compared with sensitive hybrids.
- Material
- resistant hybridse7
- Treatment
- soil compaction stresse0
- Outcome
- number of roots growing at an angle of 0°–30° in relation to the main growth axise7
- Direction
- increasee7
- Comparator
- sensitive hybridse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of soil compaction stress were investigated in maize hybrids”
e7“The resistant hybrids showed a lower decrease in root dry matter (DM) in M and H treatments at 0.0–15 cm soil depth, and an increase in the number of roots growing at an angle of 0°–30° in relation to the main growth axis”
e6“comparing to sensitive hybrids”
Claim · model-written summary
The regression between stress susceptibility index and relative trace change for dry matter, shoot to root ratio and root length was statistically significant.
- Organ / stage
- roots (R)e1
- Outcome
- regression coefficient (R 2 ) between stress susceptibility index (SSI) and relative trace change (RTC)e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effects of soil compaction stress were investigated in maize hybrids”
e1“a regression coefficient (R 2 ) between stress susceptibility index (SSI) and relative trace change (RTC) marked for changes in dry matter of shoot (S), roots (R), shoot to root (S/R) ratio and root length (R L ) and number R N was statistically significant”
Claim · model-written summary
Penetration resistance of 0.52 and 1.07 MPa was satisfactory for estimating root penetration index among maize hybrids.
Verbatim
e0“Effects of soil compaction stress were investigated in maize hybrids”
e1“The penetration resistance (PR) strength of 0.52 and 1.07 MPa was satisfactory for estimating root penetration index (RPA) among maize hybrids”
The same questions in other papers
tillage · growth · Zea mays (maize)Positive and negative results
86 papers in the same direction as this paper · 196 in the opposite direction
- positive
- negative
- no effect
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