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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (3): 255-261.DOI: 10.11686/cyxb20140330

• Orginal Article • Previous Articles     Next Articles

Effects of different nitrogen additions on the yield, quality and nutrient absorption of forage maize

CHEN Yuan-xue1,CHEN Xi1,CHEN Xin-ping2,LUO Yong1,MU Yong1,LV Shi-hua3,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;
    3.Soil and Fertilizer Institute, Sichuan Academy of Agricultural Science, Chengdu 610066, China
  • Received:2013-06-09 Online:2014-06-20 Published:2014-06-20

Abstract: A field experiment was carried out at a planting base of forage grass in Hongya, Sichuan, China to investigate the effect of nitrogen (N) addition at different rates (0, 60, 120, 180, 240 kg/ha, labelled as N0, N60, N120, N180, N240 respectively) on the yield, quality and nutrient absorption of forage maize (FM) (Zea mays-Zea mexicana hybrids, cv.Yucao 2) in 2009. Nitrogen application significantly promoted tiller number and biomass of FM at the trumpeting stage (TS) and the silking stage (SS), immediately after harvest. Aboveground dry matter increased with an increase in N rates, and increased by 60.9% at TS and 23.8% at SS under N180 compared with those under N0, but it decreased to some extent under N240. N application markedly enhanced crude protein (CP) content, and reduced the contents of neutral detergent fiber (NDF) and acid detergent fiber (ADF), so improving available nutritive value and forage quality of FM. Plant N, P and K contents reduced with plant development stage: at the jointing stage (JS): N 3.74%, P2O5 0.456%, K2O 2.50%; at TS: N 2.21%, P2O5 0.238%, K2O 2.32%; at SS: N 1.46%, P2O5 0.184%, K2O 1.08%. Nitrogen addition significantly promoted N concentration, N and P uptakes, weakly increased P concentration, but weakly reduced K concentration and barely influenced K uptake. The order of N, P and K uptakes of FM was N>K2O>P2O5, the ratios of N∶P2O5∶K2O were 8.2∶1∶5.5 at JS, 9.5∶1∶9.7 at TS, 8.0∶1∶5.8 at SS. In conclusion, N and K nutrition were very important and the appropriate rate of N was 180 kg/ha for Yucao 2 plantings in this area.

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