Selecting Fore and Succeeding Crops to Construct a Double-Cropping System That Increases the Forage Yields of Alpine Pastoral Areas on the Qinghai–Tibetan Plateau
2025
Zhiqiang Yu | Yuxin Ren | Wenhua Du | Yongqiang Yang
Double-cropping systems in which two kinds of crops are harvested per year can elevate forage yields significantly. This is the first report on a double-cropping system in the northeastern margin of alpine pastoral areas on the Qinghai&ndash:Tibetan Plateau with an elevation of 3500 m. In this experiment, eight triticale genotypes, including five varieties (&lsquo:Gannong No. 2&rsquo:, &lsquo:Gannong No. 3&rsquo:, &lsquo:Gannong No. 4&rsquo:, &lsquo:Gannong No. 7&rsquo:, and &lsquo:Zangsi No. 1&rsquo:), and three lines (C16, C23, and C25) were used as the fore crops, with the four succeeding crops being 50% of triticale mixed with 50% of forage pea (B1), 50% of triticale mixed with 50% of common vetch, 50% of oat mixed with 50% of forage pea, and 50% of oat mixed with 50% of common vetch. Over 2 years (2020&ndash:2021), among the fore crops, &lsquo:Gannong No. 4&rsquo: had the highest average hay yield (9.00 t·:ha&minus:1), crude protein content (114.97 mg·:g&minus:1), and relative feeding value (91.77), as well as the lowest average neutral detergent fiber content (598.17 mg·:g&minus:1). Among the succeeding crops, B1 had the highest average hay yield (11.45 t·:ha&minus:1) and nutritional quality. Among the interactions between the fore and succeeding crops, the highest hay yield (21.72 t·:ha&minus:1), crude protein content (262.22 mg·:g&minus:1), and relative feeding value (219.34) were obtained when &lsquo:Gannong No. 4&rsquo: was doubled with B1. The results provide a theoretical basis for carrying out a double-cropping system in the alpine pastoral areas on the Qinghai&ndash:Tibetan Plateau, and this has very important implications for crop production in this area.
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