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| Influence of potassium fertilizer reduction on rice yield and potassium utilization efficiency under wheat straw incorporation condition |
| Received:March 16, 2020 |
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| KeyWord:wheat straw incorporation;potassium fertilizer reduction;rice;yield;potassium utilization efficiency;soil potassium |
| Author Name | Affiliation | E-mail | | ZHU Yuan-peng | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | SHI Yan-jie | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | GUAN Hao | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | YE Xin-xin | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | GAO Hong-jian | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | gaohongjian2@163.com | | HUA Sheng | Anhui Xiyangyang Agricultural Science and Technology Co., Ltd, Lujiang 230088, China | | | WANG Yi-kun | Anhui Xiyangyang Agricultural Science and Technology Co., Ltd, Lujiang 230088, China | |
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| Abstract: |
| Long-term crop straw incorporation experiments were conducted to understand the effects of wheat straw return and potassium fertilizer reduction on soil potassium content, potassium accumulation in rice, and potassium utilization efficiency, as well as rice yield, under the rice-wheat rotation system along the Yangtze River region. Five treatments, including wheat straw return plus formula fertilization (K100%), wheat straw return plus formula fertilization and potassium reduction by 10% (K90%), heat straw return plus formula fertilization and potassium reduction by 20% (K80%), wheat straw return plus formula fertilization and potassium reduction by 30% (K70%), wheat straw return plus formula fertilization without potash (K0)were conducted in the field for 3 years. Compared with K100%, K90% increased soil total and available potassium by 3.31% and 6.38%, and the total and net potassium accumulation in rice increased by 1.55% and 5.13%. K80% and K70% decreased soil total and available potassium by 12.58%~15.31% and 4.26%~10.64%, respectively, and the total potassium accumulation in rice declined by 7.49%~13.62% (P<0.05). Both K80% and K70% increased the net potassium accumulation by 0.48%~1.78%, and K80% increased rice yield by 2.32%, whereas K70% decreased rice yield by 6.43%. Compared with K100%, K90%, K80%, and K70% significantly improved agronomic efficiency (15.51%~24.53%), partial productivity (17.96%~25.40%), potassium absorption, and potassium utilization efficiency (17.53%~55.36%) (P<0.05)of rice. However, reduction of potassium fertilizer over 20% decreased the economic profit.Under the condition of wheat-straw incorporation, reduction of potassium by 10% had no influence on soil available potassium but improved absorption and accumulation of potassium in rice. Nonetheless, reduction of potassium by 20%~30% decreased soil available potassium and absorption accumulation of potassium in rice. The reduction of potassium fertilizer less than 20% did not have significant influences on rice yield, but it increased the agronomic efficiency, partial productivity, absorption, and utilization of potassium fertilizer, as well as economic profit after wheat straw incorporation into the soil. |
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