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| Effects of different organic fertilizer substitutions on soil physical and chemical properties and rapeseed yield in Erhai Lake basin, China |
| Received:September 06, 2021 |
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| KeyWord:Erhai Lake basin;organic fertilizer;rapeseed;soil physical and chemical property;yield |
| Author Name | Affiliation | E-mail | | WAN Chen | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
National Field Observation and Research Station of Farmland Ecosytem in Dali, Yunnan, Dali 671004, China | | | MA Yingjun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
National Field Observation and Research Station of Farmland Ecosytem in Dali, Yunnan, Dali 671004, China
College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | ZHANG Keqiang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
National Field Observation and Research Station of Farmland Ecosytem in Dali, Yunnan, Dali 671004, China | | | WANG Feng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
National Field Observation and Research Station of Farmland Ecosytem in Dali, Yunnan, Dali 671004, China | | | SHEN Shizhou | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
National Field Observation and Research Station of Farmland Ecosytem in Dali, Yunnan, Dali 671004, China | shenshizhou@126.com |
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| Abstract: |
| This study aimed to explore the rational fertilization methods for rapeseed planting in the Erhai Lake basin, to study the impact of different organic fertilizer substitutions on soil nutrients and rapeseed yield. The rapeseed field experiment was carried out in the National Field Observation and Research Station of the Farmland Ecosystem in Dali, Yunnan. The experiment set no fertilization(CK), conventional chemical fertilizer fertilization(CF), based on the total nitrogen of CF fertilization treatment, and set solid organic fertilizer to replace 30%, 70%, and 100% chemical fertilizer treatments(T1, T2, T3)and liquid organic fertilizer to replace 30%, 70%, 100% chemical fertilizer treatment(T4, T5, T6). The results of the study showed that, compared with the soil before the experiment, except for CF and T6 with soil total nitrogen content increased by 2.66% and 6.57%, the total nitrogen and total phosphorus content of the soil under all fertilization treatments had a downward trend, and the total phosphorus content of T1, T2, and T3 soils was positively correlated with the increase in the proportion of organic fertilizers. However, T4, T5, and T6 were negatively correlated. The application of liquid organic fertilizer considerably increased the soil ammonium nitrogen, nitrate nitrogen, and available phosphorus levels in a short time. In addition to T4 treatment, the application of organic fertilizer increased the content of soil organic matter, and T5 treatment had the best effect, increased by 28.66%; T1, T2, and T4 treatments all caused the soil bulk density to increase compared with the soil before the test by 15.84%, 16.83%, and 17.82%, respectively. All of the liquid organic fertilizer substitution treatments caused the soil pH to decrease compared with the soil before the test. Single application of liquid organic fertilizer caused the greatest decrease, at 5.17%. Compared with single application of chemical fertilizer, as the replacement ratio of organic fertilizer increased, rapeseed plant height, silique length, number of siliques per plant, 1000-seed weight, and rapeseed yield all showed a downward trend, whereas T1~T6 oilseed rape yield decreased by 18.06%~76.65%; 30% organic fertilizer substitution(T1, T4)showed little difference compared with CF. Considering the effects of different fertilization treatments on the environment and rapeseed yield, 30% solid organic fertilizer substitution(T1)was found to be the superior fertilization method. |
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