| Effects of subsoiling tillage on stalk lodging resistant mechanical characteristic of maize varieties after physiological maturity |
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| DOI：10.7606/j.issn.1000-7601.2023.01.17 |
| Key Words: maize subsoiling tillage mechanical strength stalk lodging physiological maturity |
| Author Name | Affiliation | | MA Daling | Agricultural College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, 010019, China | | GAO Huixia | Agricultural College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, 010019, China | | YU Xiaofang | Agricultural College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, 010019, China | | GAO Julin | Agricultural College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, 010019, China | | LI Bo | Agricultural College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, 010019, China |
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| Abstract: |
| The subsoiling tillage and rotary tillage were studied for their effects on maize stalk lodging resistant mechanical characteristic after physiological maturity using maize varieties released druing 1970s to 2010s. The results showed that maize stalk lodging increased after physiological maturity. For different maize varieties, stalk lodging reduced by an average of 1.22 percentage point, and mechanical strength significantly increased at subsoiling tillage compared with those at shallow rotary tillage. The mechanical strength changes were larger at high planting density. The fourth crushing strength and the fifth internode bending strength of the 1970s variety increased respectively by 43.6% and 33.05%. The third to the fifth internodes rind puncture strength and the third and fifth internode bending strength of the 1980s variety, the fourth crushing strength and the third internode bending strength of the 1990s variety, the third to the fifth internodes rind puncture strength and the third internode bending strength of the 2000s variety had also significantly increased, whereas mechanical strength of the 2010s variety had no obvious change, under subsoiling tillage compare to shallow rotary tillage at high density. The stalk lodging resistance improvement was correlated with the increases of the 3rd and 4th internodes rind puncture strength and the 4th internodes bending strength and the 3rd and 5th internodes crushing strength at subsoiling tillage. However, the mechanical strength of internodes did not significantly increase and the puncture strength of the 3rd internode decreased by 0.26×107 N·m-2·10a-1 with improved maize varieties. Therefore, it was suggested that stalk mechanical characteristics were used to construct maize lodging resistance population but was not used to evaluate maize varieties stalk lodging resistance because of their one\|sidedness. Attention should be paid to building a comprehensive evaluation index system of maize variety stalk lodging resistance in future. |
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