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- W4377861692 abstract "Water is the key factor limiting dryland wheat grain yield. Mulching affects crop yield and yield components through affecting soil moisture. Further research is needed to determine the factors relationships between yield components and soil moisture with yield and identify the most important factors affecting grain yield under mulching measures. Long term 9-year field experiment in the Loess Plateau of Northwest China was carried out with a total of three treatments: no mulch (CK), plastic mulch (MP) and straw mulch (MS). Yield factors and soil moisture was measured, and relationships between them was explored by correlation analysis, structural equation model and significance analysis. The results showed that compared with CK, the average grain yield of MP and MS increased by 13.0 and 10.6%, respectively. The average annual grain yield of MP treatment was 134 kg ha-1 higher than the MS treatment. There was no significant difference in yield components among the three treatments (P<0.05). Soil water storage of MS treatment was greater than the MP treatment, although the differences were not statistically significant. Soil water storage during the summer fallow period (SWSSF) and soil water storage before sowing (SWSS) of MS were significantly higher than CK, which increased by 38.5 and 13.6%, respectively. The relationship between MP and CK was not statistically significant for SWSSF, but SWSS in MP was significantly higher than CK. In terms of soil water storage after harvest (SWSH) and water consumption in the growth period (ET), there were no significant differences among the three treatments. Based on the three analysis methods, we found that spike number and ET were positively correlated with grain yield. However, the relative importance of spike number to yield was the greatest in the MP and MS treatments, while that of ET was the greatest in CK. Sufficient SWSSF could indirectly increase spike number and ET in the three treatments. Mulch can improve yield and soil water storage. The most important factor affecting grain yield of dryland wheat was spike number under mulching, and ET in no mulch. The findings may help to understand the main factor to influence dryland wheat grain yield under mulching measures compared to no mulch." @default.
- W4377861692 created "2023-05-24" @default.
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- W4377861692 date "2023-05-01" @default.
- W4377861692 modified "2023-09-27" @default.
- W4377861692 title "The first factor affecting dryland winter wheat grain yield under mulching measures: spike number" @default.
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- W4377861692 doi "https://doi.org/10.1016/j.jia.2023.05.034" @default.
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