追氮时期及次数对马铃薯氮素吸收和土壤硝态氮残留的影响

doi:10.3969/j.issn.2096-1197.2019.05.08

Abstract

Abstract: In order to determine the optimum nitrogen topdressing period for improving nitrogen use efficiency and reducing non-point source pollution in farmland,the theoretical basis for high-yield and high-quality nitrogen management strategy of potato under mulch drip irrigation was provided.With drip irrigation under mulch,the accumulation of potato nitrogen and the residual nitrate nitrogen in soil after harvest were studied by setting different combinations and times of nitrogen topdressing.The results showed that the nitrogen uptake and accumulation of tubers in 1,2 and 3 nitrogen topdressing treatments were 1.61,1.91 and 1.98 times higher than CK,respectively,18.53% and 22.82% higher in 2 and 3 nitrogen topdressing treatments than that in 1 nitrogen topdressing treatment,respectively,and 161.23 kg/hm² in B3 treatment was the highest.NRE,NPFP and NAE in 2 and 3 nitrogen topdressing treatments were 21.89%,20.74%,57.98% and 20.66%,17.80%,49.75% higher than that in 1 nitrogen topdressing treatment respectively.The yield,NRE,NPFP and NAE of all treatments were the highest at B3,46.98 t/hm²,51.32%,149.14 kg/kg and 76.57 kg/kg,respectively.The accumulation of nitrate nitrogen in 60-80 cm soil layer was significantly lower than that in 1 and 2 nitrogen topdressing treatments.That 22.8% and 34.2% of the residual nitrogen were best applied twice at tuber formation stage and mid-swelling stage on the basis of 43% N application with drip irrigation under mulch.

Key words: Potato, Nitrogen application period, Yield, Nitrogen utilization rate, Nitrate nitrogen

CLC Number:

S532

WANG Xiangzhi, ZHANG Sheng, LI Xingxing, GAO Xiang, YUAN Zhiqiang, ZHANG Zhijun, DONG Pu. Effects of nitrogen topdressing period and number on nitrogen absorption of potato and nitrate residue in soil[J].Journal of Northern Agriculture, 2019, 47(5): 40-47.

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Effects of nitrogen topdressing period and number on nitrogen absorption of potato and nitrate residue in soil

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