| Effects of no tillage and crop rotation on yield and photosynthetic characteristics of wheat and maize in desert oasis of northwest China |
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| DOI：10.7606/j.issn.1000-7601.2022.01.02 |
| Key Words: no tillage crop rotation intercropping wheat maize photosynthetic characteristics yield traits desert oasis of northwest China |
| Author Name | Affiliation | | YANG Caihong | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | GENG Yanxiang | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | FU Xingzhou | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YAN Changgeng | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHAO Yuhao | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LUO Yongzhong | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHAI qiang | Gansu Provincial Key Laboratory of Aridland Crop Science/ College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| The purpose of this study was to explore more effective filed cropping patterns and increase crop production to achieve effective utilization of land and ecological environmental protection in oasis irrigation region of northwestern China. A field experiment was carried out to examine the effects of no tillage and crop rotation on photosynthetic characteristics, leaf chlorophyll content and yield traits in wheat/maize intercropping→ wheat/maize intercropping, wheat\|winter rape→ maize and wheat→ maize rotation in oasis region of Hexi Corridor, Gansu Province in 2016-2018. The change of every index in each treatment was not consistent in different years among different tillage methods. There was a decline in photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO2 concentration, but there was no significant difference among different treatments. No tillage had no significant differences on photosynthetic characteristic. Photosynthetic rate of wheat\|winter rape→ maize treatment was increased by -3.85%~4.91% and 1.44%~2.31% than wheat/maize intercropping→ wheat/maize intercropping and wheat→ maize rotation treatment respectively. Transpiration rate, stomatal conductance and intercellular CO2 concentration were increased by -13.01%~4.20%, 9.60%~29.36%, -0.48%~1.83% and 17.10%~34.66%, -4.58%~7.07%, -5.11%~7.41% respectively. No tillage treatments showed some advantages in leaf chlorophyll content and yield traits of wheat and maize. The leaf chlorophyll content of wheat/maize intercropping→ wheat/maize intercropping, wheat\|winter rape→ maize and wheat→ maize rotation with no tillage was increased by 1.60%, 3.14% and 5.22% in 2018. The spikelet number, grain number per spike and 1000-grain weight of wheat in wheat/maize intercropping→ wheat/maize intercropping, wheat\|winter rape→ maize and wheat→ maize rotation with no tillage were increased by 1.52%~5.08%, 0.44%~2.84% and 1.88%~3.82%, respectively. The ear height, ear length, grain number per spike and 100-grain weight of maize in wheat/maize intercropping→ wheat/maize intercropping with conventional tillage was increased by -1.80%~4.83%、-0.46%~4.55%、1.96%~11.10% and 5.16%~7.32%, respectively. The photosynthetic rate, stomatal conductance and intercellular CO2 concentration of wheat\|winter rape→maize were higher than that of wheat/maize intercropping→wheat/maize intercropping and wheat→maize rotation, while wheat/maize intercropping showed higher yield advantage. The results suggest that wheat\|winter rape→maize with no tillage improve the photosynthesis characteristics and dry matter accumulation in single plant and delay the leaf senescence, thus improve leaf water use efficiency. |
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