Plant Soil Environ., 2021, 67(7):399-407 | DOI: 10.17221/32/2021-PSE

Evaluation of efficiency of controlled-release N fertiliser on tartary buckwheat productionOriginal Paper

Xin Zhao*,1,2, Baolin Zhang*,3, Sancai Liu4, Xiushi Yang4
1 Shanxi Institute for Functional Food, Shanxi Agricultural University, Taiyuan, P.R. China
2 College of Agriculture, Shanxi Agricultural University, Taiyuan, P.R. China
3 Institute of Agricultural Products Processing, Shanxi Academy of Agriculture Science, Taiyuan, P.R. China
4 Institute of Crop Science, Chinese Academy of Agricultural Science, Beijing, P.R. China

To provide reference for scientific management of nitrogen (N) fertiliser on tartary buckwheat, the effects of the mixed application of controlled-release N fertiliser (a kind of thermoplastic polymer-coated urea types that are characterised by a semi-permeable membrane) and common urea was studied in the main tartary buckwheat production area in China. In 2018 and 2019, a two-year field experiment was conducted a randomised block design with five treatments: (1) no nitrogen fertilisation (CK); (2) 100% N from common urea (T1); (3) 15% N from controlled-released urea fertiliser (plastic coated) + 85% N from common urea (T2); (4) 30% N from controlled-released fertiliser + 70% N from urea (T3); (5) 45% N from controlled-released fertiliser + 55% N of urea (T4). The N fertilisation rate was 90 kg N/ha in all fertilisation treatments. The results showed: (1) the mixed application of controlled-release N fertiliser and common urea was conductive to enhance the yield, dry mass, N uptake and apparent N fertiliser efficiency (NFE), compared with a single application of common urea. In two seasons, NFE was 38.6% (T1), 48.6% (T2), 53.6% (T3) and 53% (T4), separately; (2) the mixed application of controlled-release N fertiliser and common urea could significantly increase the soil inorganic N content in the soil surface layer and decreased the leaching loss of N; (3) with the increasing ration of controlled-release N fertiliser, the tendency of increasing N content of crop uptake and soil residual and decreasing rate of N loss and N surplus was visible. Overall, considered the indicators of grain yield, input cost, N utilisation and N balance, the suitable N fertilisation mode for tartary buckwheat production is the mixed application of 30% controlled-release N fertiliser and 70% common urea when 90 kg N/ha is applied.

Keywords: minor crop; nutrition; crop-soil N balance; nitrogen fertiliser type

Published: July 31, 2021  Show citation

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Zhao X, Zhang B, Liu S, Yang X. Evaluation of efficiency of controlled-release N fertiliser on tartary buckwheat production. Plant Soil Environ. 2021;67(7):399-407. doi: 10.17221/32/2021-PSE.
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