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- W3120082130 abstract "BACKGROUND Excessive application of nitrogen (N) fertilizer and low nitrogen-use efficiency (NUE) are prevalent problems in rice production. Controlled-release urea (CRU) is widely adopted to increase rice yields, but the synchronicity of N release from CRU with uptake of N by plants has rarely been studied. A 2-year field experiment involving CRU and urea applications at three different N rates (240, 192 and 144 kg N ha-1 , equal to 100%, 80% and 60% of the recommended rate, respectively) was performed to compare their effects on N uptake, soil N content and rice yields. RESULTS The successive release curves of CRU in the soil matched the corresponding N uptake curves of rice plants, and significant linear correlations were observed. Grain yield and N uptake under the CRU treatment increased by 5.25-7.88% and 7.13-17.94% than urea treatments, at the same N rate, and no obvious difference was found between CRU60% and Urea100%. CRU80% and CRU60% presented the highest NUE. The contents of ammonium-nitrogen (NH4+ -N), nitrate-nitrogen (NO3- -N), and total N and the chlorophyll relative value - SPAD (Soil Plant Analysis Development) values - of the leaves under the CRU treatments were significantly higher than those under the urea treatments from heading to harvest. The contents of exchangeable sodium ion (Na+ ) and calcium ion (Ca2+ ) and the cation exchange capacity increased in response to CRU. CONCLUSION CRU increased rice yields by providing N strongly in synchrony with the N requirements of the plants, and applying CRU at 192 kg N ha-1 was an effective strategy to conserve N fertilizer, increase soil N contents and enhance NUE. © 2021 Society of Chemical Industry." @default.
- W3120082130 created "2021-01-18" @default.
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- W3120082130 date "2021-01-16" @default.
- W3120082130 modified "2023-09-26" @default.
- W3120082130 title "Controlled‐release urea improved rice yields by providing nitrogen in synchrony with the nitrogen requirements of plants" @default.
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- W3120082130 doi "https://doi.org/10.1002/jsfa.11056" @default.
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