| Spatia-l temporal variability of soil hardness and effect of soil hardness on other soil properties in rotary tillage in Guanzhong farmland |
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| DOI：10.7606/j.issn.1000-7601.2009.03.02 |
| Key Words: tillage method soil hardness water content soil temperature Guanzhong farmland |
| Author Name | Affiliation | | JIAO Caiqiang | College of Resources and Environment Northwest A＆F University,Yangling,Shaanxi 712100,China | | WANG Yiquan | College of Resources and Environment Northwest A＆F University,Yangling,Shaanxi 712100,China | | LIU Jun | College of Resources and Environment Northwest A＆F University,Yangling,Shaanxi 712100,China | | ZHAO Jiarui | College of Resources and Environment Northwest A＆F University,Yangling,Shaanxi 712100,China | | SONG Xiaoyan | College of Resources and Environment Northwest A＆F University,Yangling,Shaanxi 712100,China |
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| Abstract: |
| The objective of this study was to investigate soil hardness in the Guanzhong Plain and to determine the relationship between rotary tillage method and soil hardness in the region.The experiment was conducted in the first tableland of the Guanzhong Plain.There were two cultivation treatments (rotary tillage and deep tillage) and two cropping treatments (wheat and fallow) .Soil hardness was determined in 5cm increments from 0～40 cm during the wheat growing season.The results showed that rotary tillage before planting increased soil hardness.The effect was especially large in the 15～40 cm layer where the growth of wheat roots was limited.In contrast, the positive effects of deep tillage were observed throughout the entire wheat growing season.Thus, this study indicated that rotary tillage led to a hardening of the soil.There was a significant correlation between soil hardness and soil water content.The effect of soil hardness on soil water content increased as soil depth increased.The sensitivity of soil water content to soil hardness means that soil aridization causes double stresses of drought and mechanical stress on crop growing.Soil temperature also increased as soil hardness increased.So the current rotary tillage caused the buffering to bad environment of soil decreased, and the dependency to precipitation or irrigation increased, and soil is in remarkable fatigue state. |
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