| Effect of different formula of modifiers on soil improvement of newly built terrace |
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| DOI：10.7606/j.issn.1000-7601.2016.04.21 |
| Key Words: soil modifier soil physical and chemical property soil nutrient yield water use efficiency |
| Author Name | Affiliation | | LIU Yan-lan | Institute of Dryland Farming, Gansu Academy of Agricultural Sciences
Key Laboratory of High Water Utilization on Dryland of Gansu Province, Lanzhou, Gansu 730070, China | | GUO Xian-shi | Institute of Dryland Farming, Gansu Academy of Agricultural Sciences
Key Laboratory of High Water Utilization on Dryland of Gansu Province, Lanzhou, Gansu 730070, China | | JIANG Xiao-feng | Institute of Dryland Farming, Gansu Academy of Agricultural Sciences
Key Laboratory of High Water Utilization on Dryland of Gansu Province, Lanzhou, Gansu 730070, China | | DONG Bo | Institute of Dryland Farming, Gansu Academy of Agricultural Sciences
Key Laboratory of High Water Utilization on Dryland of Gansu Province, Lanzhou, Gansu 730070, China | | GUO Tian-wen | Institute of Dryland Farming, Gansu Academy of Agricultural Sciences
Key Laboratory of High Water Utilization on Dryland of Gansu Province, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To study the effect of different formula of modifiers on soil physical and chemical properties, nutrient status of the new terrace and the yield of the crops, a 3-year field experimental trial was carried out. The results showed that application of different modifiers formula reduced soil bulk density, increased soil porosity and field water capacity, increased soil organic matter, total nitrogen, available phosphorus and available potassium content. The effect of the surface layer (0 to 10 cm) was better than that of the bottom layer (10 cm to 20 cm). The soil bulk density of the surface layer was decreased by 5.14%～18.49%, soil porosity and field capacity by 9.14%～18.86% and 10.96%～17.19%, respectively. Soil organic matter, total nitrogen, available phosphorus and available potassium were increased by 56.11%～114.19%, 9.84%～78.69%, 48.52%～268.50%, 70.10%～427.53% respectively. (2) Compared with CK, the effect of A treatment was the largest, with an average annual decrease in the soil bulk density of 0.06 g·cm-3, an average annual increase in soil porosity and field capacity of 3.15% and 0.45%. And the average annual increase rate of soil organic matter, total nitrogen, available phosphorus and available potassium were 2.48 g·kg-1, 0.2 g·kg-1, 7.82 mg·kg-1, 129.23 mg·kg-1, respectively. The effects of other treatments showed an order of B＞C, D, E＞CK. (3) The application of modifiers could improve the crop yield and water use efficiency. Take A formula as an example, the potato yield was increased by 37.69% and 50.93% in 2012 and 2013, respectively, and wheat production by 94.41% in 2014 compared with CK. The water use efficiency of A treatment significantly was increased by 43.09%, 48.71% and 48.71% in the year of 2012, 2013 and 2014, respectively. Taken together, we proposed a formula for new terrace on semiarid region of the Loess Plateau. |
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