| The effects of bentonite on soil moisture and biological characteristics of oat at seedling stage |
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| DOI：10.7606/j.issn.1000-7601.2017.05.05 |
| Key Words: bentonite rate of emergence soil moisture content biological characteristics |
| Author Name | Affiliation | | SUN Meng-yuan | Agricultural College, Inner Mongolia Agricultural University, Huhhot, Inner Mongolia 010019, China | | LIU Jing-hui | Agricultural College, Inner Mongolia Agricultural University, Huhhot, Inner Mongolia 010019, China | | MA Bin | Agricultural College, Inner Mongolia Agricultural University, Huhhot, Inner Mongolia 010019, China | | ZHANG Yi-chao | Ordos City Dongsheng District Weather Bureau, Dongsheng, Inner Mongolia 017000, China | | YAN Wei-kai | Ottawa, Canada, Research and Development Center, Ottawa K1A 0C6, Canada | | MA Bao-luo | Ottawa, Canada, Research and Development Center, Ottawa K1A 0C6, Canada |
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| Abstract: |
| To investigate the role of bentonite soil supplement on water retention and soil amelioration as well as seedling protection in the dry farming regions of Inner Mongolia Loess Plateau, a field experiment with (0（CK）, and 6 000（D1), 12 000（D2), 18 000（D3), 24 000（D4) and 30 000 kg·hm-2（D5)）of bentonite was applied. After one-time application in 2011, the effects of application rates on oat seeding characterization and soil moisture content, microbial biomass carbon, microbial biomass nitrogen and soil enzyme activity were examined in 2012—2015. The results showed that one-time application can improve the emergence rate, in 2012, D2 and D3 were higher than that of control with 11.41% and 8.93% respectively; in 2013, D3 and D4 were higher than that of control with 8.39%,5.56% respectively; performance in 2014, D4 and D5 compared with the control improved (increased) to 10.25% and 8.32% respectively; in 2015 D4 and D5, were 8.71%,7.48% respectively higher than the control. One-time application of bentonite raised soil water content in the soil profile (0～100 cm), with the most significant increase of 1.21%～40.76% at the 10～20 cm layer. Compared to the CK treatment, bentonite increased soil microbial biomass carbon (2.92%～31.42%), nitrogen(5.05%～47.15%), catalase (4.75%～45.89%), invertase (2.73%～49.91%), urease (6.67%～70.00%) in the top 10 cm soil. It was concluded that the application of bentonite can obviously improve soil water retention, water holding capacity and soil biological traits in the plough layer during the oat seedling growth period. With time, the long-lasting effect of higher application rates of bentonite became more evident. |
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