Abstract
A field experiment was conducted to compare three tillage methods including subsoiling before sowing(Ⅰ), subsoiling at fourth leaf stage(Ⅱ), non-tillage(CK) in 2012. The effects of subsoiling on leaf area index,net photosynthetic rate, leaf area duration, dry matter accumulation, relative growth rate,root traits, yield and yield component were studied.The results showed that there are significant difference between the two subsoiling methods on dry matter production, photosynthetic performance and root development in summer maize. Leaf area index was improved by subsoiling before sowing as compared to CK at elongation stage. In addition, net photosynthetic rate at silking stage,dry matter weight at elongation stage, total root dry weight 0-100 cm soil depth and root vigour at 20-30 cm soil depth at silking stage were all significantly improved. While leaf area duration, net assimilation rate and relative growth rate showed less response. On the contrary, the plants under subsoiling at fourth leaf stage performed worse for all characters, which related to the restriction of vegetative growth, insufficient leaf source and leaf senescence. Generally, grain yield-under subsoiling before sowing increased by 1.7% as compared to CK, while reduced by 11.5% under subsoiling at fourth leaf stage, and two subsoiling methods showed significant difference. In conclusion, subsoiling before sowing(Ⅰ) had advantages of increasing summer maize yield, however, subsoiling at fourth leaf stage(Ⅱ) imposed restrictions on maize development and yield.
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Claims 10
Claim · model-written summary
Subsoiling before sowing improved leaf area index against no tillage at elongation.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf area index was improved by subsoiling before sowing as compared to CK at elongation stage.”
t0“summer maize”
Claim · model-written summary
Subsoiling before sowing significantly improved photosynthetic rate at silking.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“net photosynthetic rate at silking stage,dry matter weight at elongation stage, total root dry weight 0-100 cm soil depth and root vigour at 20-30 cm soil depth at silking stage were all significantly improved.”
t0“summer maize”
e1“Leaf area index was improved by subsoiling before sowing as compared to CK at elongation stage.”
Claim · model-written summary
Subsoiling before sowing significantly improved dry matter weight at elongation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter weight at elongation stage, total root dry weight 0-100 cm soil depth and root vigour at 20-30 cm soil depth at silking stage were all significantly improved.”
t0“summer maize”
e1“Leaf area index was improved by subsoiling before sowing as compared to CK at elongation stage.”
Claim · model-written summary
Subsoiling before sowing significantly improved root dry weight.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total root dry weight 0-100 cm soil depth and root vigour at 20-30 cm soil depth at silking stage were all significantly improved.”
t0“summer maize”
e1“Leaf area index was improved by subsoiling before sowing as compared to CK at elongation stage.”
Claim · model-written summary
Subsoiling before sowing significantly improved root vigour at silking.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root vigour at 20-30 cm soil depth at silking stage were all significantly improved.”
t0“summer maize”
e1“Leaf area index was improved by subsoiling before sowing as compared to CK at elongation stage.”
Claim · model-written summary
Leaf area duration, net assimilation and relative growth rate responded less.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf area duration, net assimilation rate and relative growth rate showed less response.”
t0“summer maize”
Claim · model-written summary
Fourth leaf stage subsoiling worsened the measured characters.
- Taxon
- plantsViridiplantaee0
- Treatment
- subsoiling at fourth leaf stagee0
- Outcome
- all characterse0
- Direction
- worsee0
Not reportedComparator
Verbatim
e0“the plants under subsoiling at fourth leaf stage performed worse for all characters”
Claim · model-written summary
Before sowing subsoiling raised grain yield by 1.7% against no tillage.
- Treatment
- subsoiling before sowinge0
- Outcome
- grain yielde0
- Direction
- increasede0
- Value
- 1.7%e0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield-under subsoiling before sowing increased by 1.7% as compared to CK”
t0“summer maize”
Claim · model-written summary
Fourth leaf stage subsoiling reduced grain yield by 11.5%.
- Treatment
- subsoiling at fourth leaf stagee0
- Outcome
- grain yielde1
- Direction
- reducede0
- Value
- 11.5%e0
- Comparator
- CKe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced by 11.5% under subsoiling at fourth leaf stage”
t0“summer maize”
e1“grain yield-under subsoiling before sowing increased by 1.7% as compared to CK”
Claim · model-written summary
The authors favor subsoiling before sowing for summer maize yield.
- Outcome
- increasing summer maize yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“subsoiling before sowing(Ⅰ) had advantages of increasing summer maize yield”
t0“summer maize”
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