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Optimal potassium management strategy to enhance crop yield and soil potassium fertility under paddy-upland rotation.
Zhu, Dandan; Zhang, Jianglin; Lu, Jianwei; Cong, Rihuan; Ren, Tao; Li, Xiaokun.
Afiliação
  • Zhu D; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Wuhan, China.
  • Zhang J; Microelement Research Center, Huazhong Agricultural University, Wuhan, China.
  • Lu J; College of Resources and Environment, Huazhong Agricultural University, Wuhan, China.
  • Cong R; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Wuhan, China.
  • Ren T; Microelement Research Center, Huazhong Agricultural University, Wuhan, China.
  • Li X; College of Resources and Environment, Huazhong Agricultural University, Wuhan, China.
J Sci Food Agric ; 101(8): 3404-3412, 2021 Jun.
Article em En | MEDLINE | ID: mdl-33230816
BACKGROUND: An unbalanced application of potassium (K) fertilizer usually destabilizes crop yield and affects soil K fertility. Developing a sustainable K management strategy requires improvements in crop yield without reducing soil K supply capacity over the long term. A combination of field experiments of K fertilization and straw return using rice (Oryza sativa L.)-oilseed rape (Brassica napus L.) rotation was designed to develop an optimal K management strategy. RESULTS: The results showed the best strategy to maintain yield was KG +S (input equivalent K removed by seed treatment and straw return), KS +KG (input equivalent K removed by straw and seed) and KC +S (conventional K fertilization and straw return) treatments, and the yield gap among different treatments expanded with the extension of planting years. There were significant differences present in rice and rape K uptake, although no differences in seed K uptake were observed under different K management strategies. The K balance was approximately maintained under KG +S and KS +KG treatments, and negative K balances were present for KN (no K application), KC (conventional fertilization), +S (straw return) and KS treatments (input equivalent K that removed by straw treatment). A positive balance was observed under KC +S treatment. Slight changes in soil exchangeable and nonexchangeable K were observed under KG +S and +S treatments. However, high inputs of K fertilizer prevented the improvement of agronomic efficiency and recovery efficiency of K. CONCLUSIONS: In summary, the optimal K management strategy was KG +S, which stabilizes the crop yield, maintains soil K fertility and maximizes K use efficiency. © 2020 Society of Chemical Industry.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Potássio / Oryza / Brassica napus / Fertilizantes / Produção Agrícola Tipo de estudo: Evaluation_studies Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Potássio / Oryza / Brassica napus / Fertilizantes / Produção Agrícola Tipo de estudo: Evaluation_studies Idioma: En Ano de publicação: 2021 Tipo de documento: Article