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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (1): 73-83.DOI: 10.11686/cyxb20140110

• Orignal Article • Previous Articles     Next Articles

Effect of nitrogen fertilizer on dry matter accumulation and yield in wheat/maize/soybean intercropping systems

CHEN Yuan-xue1,CHEN Xiao-hui1,TANG Yi-qin1,ZHANG Fu-suo2,CHEN Xin-ping2,ZHANG Chao-chun2,LIU Jing1,XU Kai-wei1   

  1. 1.College of Resource and Environmental Sciences,Sichuan Agricultural University,Chengdu 611130,China;
    2.College of Resource and Environmental Sciences,China Agricultural University,Beijing 100193,China
  • Received:2013-03-13 Online:2014-02-20 Published:2014-02-20

Abstract: The effects of nitrogen fertilizer (on wheat 0,60,120,180,240 kg N/hm2,marked as WN1,WN2,WN3,WN4,WN5; on maize 0,97.5,195,292.5,390 kg N/hm2,marked as MN1,MN2,MN3,MN4,MN5; on soybean as SN1,SN2,SN3,SN4,SN5) on dry matter accumulation (DMA) and grain yield (GY) of three crops in the wheat/maize/soybean relay-cropping system were studied by field experiment in 2011 and 2012. Ⅰ) DMA and GY of the three crops increased significantly with N application (P<0.01). Ⅱ) Wheat DMA and GY at the tillering stage (TS),jointing stage (JS),flowering stage (FS) and maturity stage (MS) increased with increasing rates of N. DMA at MS was the highest in treatment WN4 (20610 kg/hm2) and GY at MS was the highest in treatment WN5 (8176 kg/hm2) but there was no significant difference between WN3,WN4,and WN5 treatments; Ⅲ) Maize DMA at the jointing stage (JS),flare opening stage (FS) and silking stage (SS) increased initially,then decreased with increasing rates of N,and was highest in MN3. Maize DMA and GY at MS increased with increasing rates of N and they were both highest in treatment MN5 with 13143 and 6976 kg/hm2,respectively,while there was no significant difference between WN4 and WN5. Ⅳ) Soybean DMA at FS and MS and GY initially decreased then increased with increasing rates of N,and its DMA and GY were the highest in SN4 (5457 and 1977 kg/hm2,respectively),while there was no significant difference between WN4 and WN5. Ⅴ) Total GY and economic output (TEO) of the wheat/maize/soybean annual relay-cropping system rose with increasing rates of N and were the highest in the N5 treatment with 11959 kg/hm2 and 27288 yuan/hm2,respectively. The economic benefit of TEO and N input was highest in N4 treatment with 25196 yuan/hm2 and there was no significant difference between N3,N4,and N5 treatments. The ratio of wheat,maize and soybean economic output to TEO of the system was 32%,55%,13%,respectively. So in the wheat/maize/soybean annual relay-cropping system maize is the top crop with wheat second and soybean third. Suitable N rates are 120 kg/hm2 for wheat,195-292.5 kg/hm2 for maize,255-382.5 kg/hm2 for the annual system with proper N top application or with no application for soybean according to the growth.

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