| Effects of different tillage practices on physical characteristics of irrigated sierozem soil and maize yield |
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| DOI：10.7606/j.issn.1000-7601.2022.03.21 |
| Key Words: tillage practices soil physical characteristics maize yield economic benefits irrigated limestone soil |
| Author Name | Affiliation | | WANG Chengbao | Institute of Soil Fertilizer and Water-saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China | | WEN Meijuan | Institute of Soil Fertilizer and Water-saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China | | YANG Sicun | Institute of Soil Fertilizer and Water-saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China | | HUO lin | Institute of Soil Fertilizer and Water-saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China | | JIANG Wanli | Institute of Soil Fertilizer and Water-saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To explore the effects of different tillage measures on the soil physical properties of sierozem soil and corn yield in the Yellow River irrigation area of Gansu, four single tillage practices and two rotational tillage treatments including conventional tillage (CT), rotary tillage (RT), subsoiling tillage (ST) and no tillage (NT) treatment as well as conventional tillage-no tillage (CT-NT), subsoiling-no tillage (ST-NT) were set up in Gansu Yellow River irrigation district on continuous 8-year-tillage cornfields from 2014 to 2017 in the corn fields. Compared with CT, RT significantly reduced the soil bulk density in 0~10 cm and 10~20 cm depth, which decreased by 8.70% and 5.56% (P<0.05) respectively in the fourth year (2017). Compared with CT, the soil bulk density of ST, NT, CT-NT, ST-NT treatments in 20~30 cm and 30~40 cm soil depth had a decreasing trend during the four years and significantly decreased by 4.38%,3.16%,9.25%,7.54% and 11.11%,5.56%,6.00%,11.11% in the fourth year. The CT and RT treatments reduced the porosity in 0~20 cm soil depth significantly, when compared with CT, the porosity of ST, CT-NT, ST-NT in 20~30 cm and 30~40 cm soil depth increased significantly by 4.42%, 9.60%, 7.78% and 14.18%, 7.51%, 14.18% in the fourth year (2017). Different tillage treatments reduced the soil compactness of 0~45 cm soil layer, compared with the pre-test (2014), and it was reduced 36.88% and 20.97% in the ST and ST-NT treatments in 2017. CT and RT treatments reduced the compactness in 0~20 cm soil depth significantly, while ST, ST-NT reduced the compactness in 25~45 cm soil depth. Compared with RT, CT, NT and CT-NT, the soil infiltration rate of ST increased significantly by 65.87%, 81.21%, 44.80%, and 31.72% respectively. Furthermore, ST-NT increased the corn annual average yield and economic benefit. The annual average yield was 15 517.7 kg·hm-2, and the best economic benefit was 27 799 Yuan·hm-2. Comprehensive analysis showed that the ST-NT treatment was the best farming mode to promote the soil physical properties and production performance in the four-year farming system. |
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