| Effects of bundled straw covering on yield of dryland winter wheat in semiarid region |
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| DOI：10.7606/j.issn.1000-7601.2017.02.03 |
| Key Words: bundled straw covering dryland winter wheat yield soil moisture soil temperature |
| Author Name | Affiliation | | LI Bo-wen | College of Agronomy, Gansu Agricultural University/ Gansu Provincial Key Lab of Aridland Crop, Lanzhou, Gansu 730070, China | | YANG Chang-gang | College of Agronomy, Gansu Agricultural University/ Gansu Provincial Key Lab of Aridland Crop, Lanzhou, Gansu 730070, China | | LAN Xue-mei | College of Agronomy, Gansu Agricultural University/ Gansu Provincial Key Lab of Aridland Crop, Lanzhou, Gansu 730070, China | | SONG Ya-li | College of Agronomy, Gansu Agricultural University/ Gansu Provincial Key Lab of Aridland Crop, Lanzhou, Gansu 730070, China | | LI Shou-lei | College of Agronomy, Gansu Agricultural University/ Gansu Provincial Key Lab of Aridland Crop, Lanzhou, Gansu 730070, China | | CHANG Lei | College of Agronomy, Gansu Agricultural University/ Gansu Provincial Key Lab of Aridland Crop, Lanzhou, Gansu 730070, China | | HAN Fan-xiang | College of Agronomy, Gansu Agricultural University/ Gansu Provincial Key Lab of Aridland Crop, Lanzhou, Gansu 730070, China | | CHENG Hong-bo | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HUANG Cai-xia | College of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHAI Shou-xi | College of Agronomy, Gansu Agricultural University/ Gansu Provincial Key Lab of Aridland Crop, Lanzhou, Gansu 730070, China |
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| Abstract: |
| With the purpose to probe new mulching cultivation technology for sustainable development of winter wheat in northwest Loess Plateau, a field experiment was conducted to study the effects of different mulching patterns (bundled straw covering: BSC, mulching with used plastic film after harvest: PAH, uncovered and row-seeding: CK) and fertilization treatments (pure N and P2O5: 90 kg·hm-2, 120 kg·hm-2, 150 kg·hm-2) on the yield of dryland winter wheat. The results showed that mulching patterns and fertilizer amount had significant effects on grain yield, yield components, water consumption amount and water use efficiency (WUE), and their interaction effect was also significant. The grain yield reached 5 305.0 kg·hm-2 under BSC, which was 24.0% and 37.5% higher than that under PAH and CK, and the WUE reached 10.8 kg·hm-2·mm-1, which was 20.6% and 33.3% higher than that under PAH and CK, respectively. Under same fertilizer amount, the yield and WUE of BSC were significantly higher than those of PAH and CK. In aspects of yield components, the spike number per unit area of BSC was 27.0% and 42.2% higher than that of PAH and CK, respectively; however, the grain number per spike reduced by 14.3% and 6.7%, and the 1000-grain weight reduced by 2.3% and 6.8%, respectively. Compared to CK, both BSC and PAH increased soil moisture significantly during the whole growth period, in which BSC was the best before the revival stage, and PAH was the best after the jointing stage. By comparing the difference of soil temperature in 0～25 cm during the whole growth period, it was found that BSC showed a warming effect before wintering, being 1.2℃ higher than CK, but it showed a cooling effect after revival stage, being 1.8℃ lower than CK; PAH showed a warming effect during the whole growth period, being 0.9℃ higher than CK in average. Based on path analysis, it was concluded that BSC increased the spike number per unit area and the yield of winter wheat mainly by improving soil hydrothermal condition. |
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