BACKGROUND It has been frequently argued that growers have less incentive to manage the evolution and spread of herbicide-resistant weeds on leased than on owned land. This is because resistance management provides long-term rather than short-term benefits that operators may be less assured of capturing on land they do not own. Yet, empirical evidence supporting this argument has been lacking. RESULTS This study reports on results from a large-scale national survey of weed management and other crop production practices on US agricultural fields. Up to 11 weed management practices were compared across owner-operated versus renter-operated fields. Analysis of survey data from corn and soybean fields did not support the hypothesis that adoption of resistance management practices is lower on rented acres. In most instances, there were no statistically significant differences in herbicide use or weed management practices on rented versus owned land. This was true at both national and regional levels of analysis. Where there were significant differences, practices associated with greater herbicide resistance management were, as often as not, more prevalent on rented than owned land. CONCLUSIONS A useful area of future research would be to test for land tenure differences in resistance management using multivariate analysis to control for confounding effects. Unobserved farmer or land characteristics may be confounding results and masking land tenure effects. Results here, however, suggest that these other effects are dominating any obvious disincentive effects of land leasing on resistance management. Of greater concern, the adoption of key resistance management practices was low on both owned and rented land. © 2020 Society of Chemical Industry.

中文翻译：

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农民在拥有和租用土地上对杂草的管理方式是否有所不同？来自美国玉米和大豆农场的证据。

背景技术经常有人争辩说，与在拥有土地上相比，在租赁土地上，种植者对管理抗除草剂杂草的进化和传播的动机更少。这是因为抵抗力管理提供的是长期而非短期利益，而运营商可能无法保证他们会在自己不拥有的土地上获得土地。但是，缺乏支持该论点的经验证据。结果本研究报告了对美国农业领域的杂草管理和其他作物生产实践进行的大规模全国性调查的结果。在所有者经营和承租人经营的田间，对多达11种杂草管理实践进行了比较。对玉米和大豆田调查数据的分析不支持以下假设：在租用的土地上采用抗药性管理措施的比例较低。在大多数情况下，在租用土地和自有土地上，除草剂的使用或杂草管理方法没有统计学上的显着差异。在国家和区域分析层面上都是如此。在存在显着差异的地方，与更好的除草剂抗性管理相关的实践在土地上的出租比在拥有土地上的更为普遍。结论未来研究的有用领域将是使用多变量分析来控制混杂效应，以测试抗性管理中的土地保有权差异。没有观察到的农民或土地特征可能会混淆结果并掩盖土地使用权的影响。但是，这里的结果表明，这些其他影响主导了土地租赁对抵抗力管理的任何明显的抑制作用。更令人担忧的是 自有土地和租赁土地上采用的主要阻力管理措施均很少。©2020年化学工业协会。