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| Effects of Biochar on Soil Moisture, Organic Carbon and Available Nutrient Contents in Manural Loessial Soils |
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| KeyWord:biochar; manural loessial soil; soil moisture; organic carbon; available nutrients |
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| Abstract: |
| It has been considerably reported about the applications of biochar as soil amendment to acidic soils, however, few literature has been reported about the applications of biochar to calcareous soils of northern China. Therefore, a field trail was conducted to study the effects of biochar on soil moisture, soil organic carbon and available nutrient contents in manural loessial soils of Guanzhong area, Shaanxi Province, PR China. The trail design was the randomly arranged blocks, with 5 treatments and 3 replications. The experimental treatments included 5 levels of biochar：no biochar（CK）, 1000 kg·hm-2（T1）, 5000 kg·hm-2（T2）, 10 000 kg·hm-2（T3） and 20 000 kg·hm-2（T4）, and soil samples were sampled at regular intervals during wheat crop growing period（tillering stage, reviving stage, jointing stage, heading stage and grain filling stage）. The results indicated that the soil moisture contents of all the treatments showed an increasing trend after a decrease, with the rise of biochar application rates, and maximum soil moisture was recorded in T4, while minimum moisture was recorded in T2. The order of soil organic carbon contents of different treatments was recorded as T4>T3>T2>T1>CK. The contents of alkaline hydrolysis nitrogen and available phosphorus were highest in T1 while the minimum contents were recorded in T4 and CK, generally, these two parameters showed an initially increase but decreasing subsequently trend, with the increasing application rates of biochar. The soil readily available potassium contents in the different treatments followed a order as T4>T3>T2>T1>CK. It can be concluded that as compared with the low application rates of biochar, higher biochar application rates were conducive in enhancing the soil moisture, soil organic carbon and readily available potassium contents, however, low application rates of biochar markedly increased the alkaline hydrolysis nitrogen and available phosphorus contents of soil as compared with the higher rates of biochar. |
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