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

doi:10.11686/cyxb20140330

Abstract

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.

CLC Number:

S816.11

CHEN Yuan-xue,CHEN Xi,CHEN Xin-ping,LUO Yong,MU Yong,LV Shi-hua,XU Kai-wei. Effects of different nitrogen additions on the yield, quality and nutrient absorption of forage maize[J]. Acta Prataculturae Sinica, 2014, 23(3): 255-261.

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