一项2026年的研究显示,只有23%的爱荷华农民使用覆盖作物,尽管它们对环境有利。 A 2026 study reveals only 23% of Iowa farmers use cover crops, despite their environmental benefits.

爱荷华州立大学一项2026年的研究发现,目前只有23%的爱荷华农民使用作物,尽管这些作物已证明在减少硝酸盐污染和改善土壤健康方面有益处。 A 2026 study by Iowa State University finds that only 23% of Iowa farmers currently use cover crops, despite their proven benefits in reducing nitrate pollution and improving soil health. 基于2014年至2018年数据的研究显示,大多数农民要么不协调地使用,要么根本不使用,需要广泛采用,约为750万英亩,以大幅改善水质。 Research based on data from 2014 to 2018 shows most farmers either use them inconsistently or not at all, with widespread adoption—around 7.5 million acres—needed to significantly improve water quality. 专家说,养分保留和侵蚀控制等好处通常在持续使用4至6年之后出现,但潜在产量影响和困难的种植条件等挑战阻碍了收养。 Experts say benefits like nutrient retention and erosion control typically emerge after four to six years of consistent use, but challenges such as potential yield impacts and difficult planting conditions hinder adoption.