| Effect of long-term NP chemical fertilization on soil exchangeable Ca distribution and accumulation with different cropping systems in the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2012.04.12 |
| Key Words: NP chemical fertilizer different cropping systems exchangeable Ca distribution and accumulation |
| Author Name | Affiliation | | WEI Feng | Key Subject of Soil and Water Conservation & Desertification Control, College of Environment Science and Engineering, Southwest Forestry University, Kunming, Yunnan 650224, China
Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China | | HAO Mingde | Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Based on long-time location experiments, the changing condition of exchangeable Ca in soil profiles of different cropping systems under the condition of 22 years' continuous application of NP chemical fertiliz
er in the Loess Plateau was studied. The results show that the content of exchangeable Ca is high because of research area was calcareous soil. The eluviation and accumulation of exchangeable Ca occur in soil profiles. The peak is at 140～180 cm soil depth with the values of 13 180, 12 597, 11 960, 11 778, 11 590 mg/kg and 11 290 mg/kg under the maize wheat(2a)+millet rotation, pea-wheat(2a)+millet rotation, sainfoin-wheat(2a) rotation, pea-wheat(2a)+maize rotation, wheat succession and wheat(2a)+millet-maize rotation systems, respectively. The accumulation of exchangeable Ca in soil profiles (0～200 cm) under the maize-wheat(2a)+millet rotation is 269.67 t/hm2, which is higher than those of other treatments
. However the accumulation of exchangeable Ca in soil profiles (0～200 cm) under the wheat succession is 218.78 t/hm2, which is lower than those of other treatments. The results suggest that different crops and cropping systems have effects on exchangeable Ca distribution in soil profile. The results also indicate that the total accumulation amount of exchangeable Ca in soil profiles (0～200 cm) are not significantly different in various cropping systems. |
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