不同添加剂处理对水稻秸秆腐解效果的影响

doi:10.3864/j.issn.0578-1752.2012.12.009

Abstract

Abstract: 【Objective】The objective of the experiment is to study the effect of different chemical additives on the changes of physical and chemical properties, nutrient, humic substances and germination index (GI) of decomposition of rice straw and help reasonable use of organic resources theoretically and technically. 【Method】In the present study, rice straw was used as organic material, EM microorganism agents and chemical additives, such as FeSO4, Na2SO4, lime and alkali slag, were mixed and cultured in the incubator. Changes of pH, organic matter, NPK nutrient and humic acid of decomposition of rice straw were analyzed. The effect of extracts of decomposition on GI of turnip seeds was also determined.【Result】After 54 days, the results showed that the pH values of the decomposition in each treatment were 8.17 to 8.65, slightly alkaline. Changes of physical properties of decomposition also indicated that straw decomposed thoroughly. The soil organic carbon and nutrient contents in treatments with 10% alkali slag, 3% FeSO4 and 10% alkali slag combined with 3%FeSO4 were higher than that in other treatments. Humic substances contents in treatments with 3% FeSO4 and 10% alkali slag combined with 3% FeSO4 were 76.1 and 78.0 g•kg-1, respectively, which were significantly higher than those in other treatments. Chemical additives also improved the quality of humic substances. In treatments with 10% alkali slag and 10% lime, the humic acid contents were 47.7 and 50.3 g•kg-1, respectively, and the HA/FA ratios were more than 2. In treatments with 10% alkali slag, 3% FeSO4, and 10% alkali slag combined with 3% FeSO4, GI was higher than 80% indicating that these treatments could not only promote the decomposition of rice straw, but also eliminate the toxicity of the decomposition.【Conclusion】 Above results indicated that alkali slag and FeSO4 could significantly promote straw decomposition efficiently and improve the quality of decomposition.

Key words: additives, rice straw, humic substance, germination index

DI Xiu-Cai, LIU Ming, LI Zhong-Pei, XU Yang-Chun. Effect of Different Additives on Decomposition of Rice Straw[J].Scientia Agricultura Sinica, 2012, 45(12): 2412-2419.

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