| Study on impact of nitrogen supply on exchangeable calcium content of calcareous soil |
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| DOI：10.7606/j.issn.1000-7601.2011.05.31 |
| Key Words: calcareous soil nitrogen exchangeable calcium degree of calcium saturation |
| Author Name | Affiliation | | XU Hai | 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 | | WANG Hao | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | XU Shuang | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | WANG Yongjian | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | LI Peng | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To reveal “sub-healthy” phenomenon, which brought with continually increasing of chemicals using into soil, and to renew the traditional concept that calcareous soil would not appear the phenomenon of calcium lack, an experiment was cond
ucted to analyse the impact of NH4Cl, (NH4)2SO4, NH4NO3 and urea treatment on exchangeable calcium content of calcareous soil. The result indicated: soil exchangeable calcium content presented various degree of decline after calcareous soil was drip washed by same volume and different concentration NH4Cl, (NH4)2SO4, NH4NO3 solutions, and the impact of the same equivalent NH
+4,(NH4)2SO4 solution on soil exchangeable calcium was relatively larger than that of NH4Cl solution and NH4NO3 solution, the degree of relation was: NH4NO3＜NH4Cl＜(NH4)2SO4; when urea was executed into soil sample to cultivate, the soil exchangeable calcium content assumed remarkable invers
e correlation with time within 7 days, but it tended to be steady after that. The research conclusion: the massive and long-term chemistry nitrogenous fertilizer employment caused the exchangeable calcium content in surface layer calcareous soil to reduce gradually, there was weak-decalcification phenomenon, and all degree of calcium saturation dropped to 50% or less, and the soil presented “sub-healthy” condition. |
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