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| Analysis of rice seedling growth restriction factors under biogas slurry application |
| Received:September 06, 2021 |
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| KeyWord:biogas slurry;rice seedling;ammonium nitrogen;limiting factor;security threshold |
| Author Name | Affiliation | E-mail | | ZHANG Liping | Institute of Agricultural Resources and Environment, Jiangsu Province Academy of Agricultural Sciences, Key Laboratory for Crops and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | SUN Guofeng | Institute of Agricultural Resources and Environment, Jiangsu Province Academy of Agricultural Sciences, Key Laboratory for Crops and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | WANG Zichen | Institute of Agricultural Resources and Environment, Jiangsu Province Academy of Agricultural Sciences, Key Laboratory for Crops and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | ZONG Jiao | Institute of Agricultural Resources and Environment, Jiangsu Province Academy of Agricultural Sciences, Key Laboratory for Crops and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | ZHOU Wei | Institute of Agricultural Resources and Environment, Jiangsu Province Academy of Agricultural Sciences, Key Laboratory for Crops and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | SHENG Jing | Institute of Agricultural Resources and Environment, Jiangsu Province Academy of Agricultural Sciences, Key Laboratory for Crops and Animal Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | nkysj@hotmail.com |
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| Abstract: |
| To improve the safety of rice seedling growth under biogas slurry(BS)application in paddy fields, five different concentrations of BS treatments were set up to analyze and study the growth indicators of the seedlings and the physical and chemical properties of the soil. The results showed that excessive application of BS increased the NH4+-N concentration and electrical conductivity(EC)value of the soil solution, thereby resulting in the suppression of seedling growth, a decrease in fresh weight and plant height, and an increase in the root yellowing rate. The NH4+-N concentration and EC value of the soil solution were negatively correlated with the fresh weight of the seedlings (P<0.01). The concentration of NH4+-N in the soil solution was relatively stable after low-volume application of BS and more sensitive after over-application, which can be used as an indicator. The concentration of NH4+-N in the soil was a key factor that restricts the growth of seedlings. The maximum safety threshold of seedlings' tolerance to NH4+-N in the soil solution was 90.8 mg·L-1, and the maximum safe absorption threshold of NH4+-N in the BS-water mixture was 314.0 mg·L-1. |
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