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Benchmarking break-crops with wheat reveals higher risk may limit on farm adoption
European Journal of Agronomy ( IF 5.2 ) Pub Date : 2019-09-01 , DOI: 10.1016/j.eja.2019.125921
Andrew Fletcher

Abstract Typically dryland rain fed cropping systems in much of the world (Australia, North America, Europe and the Middle East) are dominated by cereals, such as wheat, even though the rotational benefits of other crops are well documented. Presumably farmers see an advantage to wheat and this paper tested the hypothesis that on-farm break-crop yields are lower compared to wheat, and more variable. Farm level yields for wheat, barley, hay, oats, triticale, canola, lupin, chickpea, and field pea were taken from a survey of Western Australian grain farms (180–302 farms per year). In general, the yield of broad leaf crops was less than cereals and more variable. Additional data were sourced from published experiments and then yields were compared with wheat using linear regression with wheat as the x-axis and break crop as the y-axis. All break -crops were more sensitive to low yielding environments than wheat, as indicated by a positive intercept with the x-axis. Barley and wheat yields were closely related (R2 = 0.63), but in environments where yield was less than 1.25 t/ha wheat tended to yield more, while barley out yielded wheat when yields were greater than 1.25 t/ha. There was a poor relationship between either oat grain (R2 = 0.26) or hay (R2 = 0.10) yields and wheat indicating that these maybe potential income diversification options. Canola was the least variable (R2 = 0.54) broadleaf crop compared to wheat, with an intercept of 0.15 t/ha and for every 1 t/ha increase in wheat yield, canola yield increased by 0.56 t/ha. If increased diversity of crop species on-farm is the objective, then varieties and management packages that increase the yield and reliability of broadleaf crops relative to wheat will need to be developed.

中文翻译:

以小麦为基准的间断作物显示更高的风险可能会限制农场采用

摘要 在世界大部分地区(澳大利亚、北美、欧洲和中东),典型的旱地雨养作物系统以谷物为主,例如小麦,尽管其他作物的轮作收益已得到充分证明。据推测,农民看到了小麦的优势,本文检验了农场间断作物产量低于小麦的假设,而且变化更大。小麦、大麦、干草、燕麦、小黑麦、油菜、羽扇豆、鹰嘴豆和豌豆的农场产量来自对西澳大利亚粮食农场(每年 180-302 个农场)的调查。总体而言,阔叶作物的产量低于谷物,且变化更大。额外的数据来自已发表的实验,然后使用线性回归将小麦作为 x 轴,中断作物作为 y 轴,将产量与小麦进行比较。如与 x 轴的正截距所示,所有断裂作物对低产环境比小麦更敏感。大麦和小麦的产量密切相关(R2 = 0.63),但在产量低于 1.25 吨/公顷的环境中,小麦往往产量更高,而当产量高于 1.25 吨/公顷时,大麦产量更高。燕麦谷物 (R2 = 0.26) 或干草 (R2 = 0.10) 产量与小麦之间的关系不佳,表明这些可能是潜在的收入多样化选择。与小麦相比,油菜籽是变化最小的(R2 = 0.54)阔叶作物,截距为 0.15 吨/公顷,小麦产量每增加 1 吨/公顷,油菜籽产量增加 0.56 吨/公顷。如果增加农场作物种类的多样性是目标,
更新日期:2019-09-01
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