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Controlled‐Release Nitrogen Fertilizer Improved Lodging Resistance and Potassium and Silicon Uptake of Direct‐Seeded Rice
Author(s) -
Zhang Shugang,
Yang Yuechao,
Zhai Weiwei,
Tong Zhaohui,
Shen Tianlin,
Li Yuncong C.,
Zhang Min,
Sigua Gilbert C.,
Chen Jianqiu,
Ding Fangjun
Publication year - 2019
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2018.12.0765
Subject(s) - cru , urea , oryza sativa , agronomy , fertilizer , biology , crop , potash , potassium , nitrogen , seeding , coated urea , chemistry , biochemistry , organic chemistry , ecology , climate change , gene
Lodging is a severe problem for rice ( Oryza sativa L.) because it interferes with mechanical harvesting, and potentially results total crop loss. This study investigated whether a controlled‐release urea (CRU) could reduce lodging, improve the uptake of K and Si, and yields of direct‐seeded rice. The 2‐yr field experiment included four rates of CRU (120, 180, 240, and 360 kg N ha −1 ), each provided in one application; a conventional urea fertilizer provided in four applications (360 kg N ha −1 total); and a control with no N fertilizer. Results indicated that the N release rates from the CRUs were matched well to N uptakes by rice plants; hence, N use efficiencies were improved. Concentrations of K and Si in rice tissues were much higher for treatments with the full and reduced rates of CRU than for the full rate urea treatment. Lodging of rice only appeared to occur in the urea treatment. Microscopic examination revealed that cells of rice stems provided with CRU treatments were more resistant to lodging than stem cells from plants in the urea treatment.