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Effects of Intercropping, Nitrogen Fertilization and Corn Plant Density on Yield, Crude Protein Accumulation and Ensiling Characteristics of Silage Corn Interseeded into Alfalfa Stand

文献类型： 外文期刊

作者： Xu, Ruixuan 1 ; Zhao, Haiming 3 ; You, Yongliang 3 ; Wu, Ruixin 3 ; Liu, Guibo 3 ; Sun, Zhiqiang 1 ; Bademuqiqige 1 ; Zhang, Yingjun 1 ;

作者机构： 1.China Agr Univ, Coll Grassland Sci & Technol, Beijing 100193, Peoples R China

2.Minist Agr & Rural Affairs, Key Lab Grassland Management & Utilizat, Beijing 100193, Peoples R China

3.Hebei Acad Agr & Forestry Sci, Dryland Farming Inst, Hengshui 053000, Peoples R China

4.Key Lab Crop Drought Resistance Hebei Prov, Hengshui 053000, Peoples R China

关键词： intercropping systems; alfalfa; silage corn; nitrogen; forage quality

期刊名称：AGRICULTURE-BASEL （ 影响因子：3.408； 五年影响因子：3.459 ）

ISSN：

年卷期： 2022 年 12 卷 3 期

页码：

收录情况： SCI

摘要： Interseeding silage corn into an alfalfa stand following its spring harvests to produce mixed silage would feasibly break the restriction of alfalfa production during a hot-rainy summer. In this 2-yr experiment, the alfalfa-silage corn intercropping system (AC) with nitrogen (N) fertilization rates of 0, 60, 120, and 180 kg N ha(-1) and corn plant densities of 30,000, 45,000, and 60,000 plants ha(-1) was compared with the monocultured corn (CK) managed using the local farmers' practice. Intercropping with alfalfa significantly decreased the dry matter (DM) yield of the corn by 31.5% on average, while increasing the N application rate and corn plant density promoted DM yield and crude protein (CP) accumulation of the intercropped corn, and the intercropping system could achieve the same CP yield as CK-it did in most cases. Although the DM contents, pH values, and NH3-N concentrations were decreased in the mixed silage, its fermentation quality was not reduced and the CP, water soluble carbohydrates, and lactic acid contents were dramatically increased by 16.3%, 17.8%, and 72.9% compared with those of CK, respectively. For the opposite effects of N fertilization and corn density on silage quality, the treatment combination with a medium corn density (45,000 plants ha(-1)) fertilized at a medium N rate (120 kg N ha(-1)) was evaluated as the optimum for more balanced system productivity, silage nutritive values and fermentative characteristics during the coexisting period.

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