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| Effects of Slow-release Nitrogen Fertilizers onNitrogen Uptake, Yield and Quality of Forage Maize |
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| DOI：10.16768/j.issn.1004-874X.2022.05.007 |
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| Abstract: |
| 【Objective】The study was carried out to explore the effects of different types of slow-release nitrogen
fertilizers and different proportion with urea on yield and quality of forage maize, which would provide theoretical basis
for green and high-quality cultivation of forage maize in Yunnan Province.【Method】A field experiment was conducted
with forage maize cultivar of‘Qiaodan 6’, and eight treatments were set: no nitrogen as the control, urea alone, slowrelease nitrogen fertilizer with DMPP nitrification inhibitor and slow-release nitrogen fertilizer with γ-polyglutamic acid
in combination with urea by ratios of 2 ∶ 8, 4 ∶ 6 and 6 ∶ 4, respectively. The effects of different types of slow-release
nitrogen fertilizers with urea at the same level of nitrogen application on the growth, yield and nitrogen utilization of forage
maize were investigated.【Result】The plant height, leaf area index, fresh yield and dry matter accumulation of forage maize
under the treatment of slow-release nitrogen fertilizer containing DMPP and urea at the ratio of 6 ∶ 4 were significantly
higher than those of other treatments, and the maximum fresh yield at harvest period was 84.62 t/hm2
and the maximum dry
matter mass was 25.35 t/hm2
. Compared with urea alone treatment, crude protein content, aboveground nitrogen accumulation
amount and nitrogen utilization efficiency of A60 treatment increased by 44.33%, 48.84% and 61.84%, respectively.
【Conclusion】The slow-release nitrogen fertilizer containing DMPP and urea at the ratio of 6 ∶ 4 significantly increased the plant height and leaf area index of forage maize compared with other treatments, which was beneficial to the accumulation of
fresh yield and dry matter accumulation of forage maize, and increased its forage quality and nitrogen utilization. Therefore, this
ratio was the best ratio for green and high-quality cultivation of forage maize. |
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