Maximizing food equivalent unit yield for forage maize production without notably compromising dry matter yield and feed quality in a semi-arid region

文献类型： 外文期刊

第一作者： Jiang, Congze

作者： Jiang, Congze;Lai, Xingfa;Gao, Wei;Ma, Renshi;Yang, Xianlong;Jiang, Congze;Lai, Xingfa;Gao, Wei;Ma, Renshi;Yang, Xianlong;You, Yongliang;Zhang, Zhixin

作者机构：

关键词： Planting density; N application rate; Dry matter yield; Forage quality; Food equivalent unit yield

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：5.6； 五年影响因子：5.7 ）

ISSN： 0926-6690

年卷期： 2024 年 218 卷

页码：

收录情况： SCI

摘要： Food equivalent unit (FEU) is a vector used to measure the value of food based on its calorie and protein content and their digestibility. However, the optimal planting density and N application rate for maximizing the FEU yield (FEUY) of forage maize (Zea mays L.) is still poorly understood in the fast-growing animal husbandry regions of the Chinese Loess Plateau. Here, a 2-year consecutive field experiment was conducted to explore the impacts of planting density, N application rate, and their interactions on growth, dry matter yield (DMY), forage quality, and FEUY of a dominant forage maize cultivar. Planting density significantly affected the stem diameter, LAI, DMY, and dry matter allocation (DMA) of the leaf. Initially, increasing the N rate increased the stem diameter, LAI, FEUY, and DMY of forage maize and then decreased. The stem diameter, LAI, FEUY and aboveground DMY peaked under 180 kg center dot ha- 1 N in both years. Moreover, N application significantly increased the crude protein content of the whole plant and decreased the acid detergent fiber content. The surface fittings of the 2-year study indicated that 110,000 plants center dot ha- 1 (plant density) and 171.2 kg center dot ha- 1 (N rate) obtained the greatest DMY (19.0 t center dot ha- 1). The grade index (a comprehensive evaluation index for forage quality) peaked at 15.4 MJ center dot d-1 under 94,000 plants ha-1 and 270 kg center dot ha- 1. The 110,000 plants center dot ha- 1 plant density and 181.5 kg center dot ha- 1 N rate jointly maximized the FEUY (11,125.4 FEU center dot ha- 1), maintaining 99.9 % of the maximum DMY and 97.5 % of the maximum grade index. Thus, 110,000 plants center dot ha- 1 plant density and 181.5 kg center dot ha- 1 N rate are recommended for high-productivity forage maize production, without notably compromising dry matter yield and feed quality. This research is conducive to advancing the coordinated development of forage crop cultivation and herbivorous livestock farming in semi-arid rainfed areas.

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