Grid sampling allows a variable rate of lime to be applied and has been marketed as a cost saver to producers. However, there is little research that shows if this precision application is profitable or not. Previous research on variable-rate lime has considered only a small number of fields. This paper uses soil sampling data from 111 fields provided by producers in Oklahoma and Kansas. The 5-year average net present values are compared between variable-rate and uniform-rate lime for grain-only wheat production, dual-purpose wheat grain and forage production, and a wheat–soybean rotation. Sensitivity analysis was done for varying grain prices as well as grain yield potential. When using historical average yields and recent prices for Oklahoma, variable rate was not profitable on average for these 111 fields for either a grain-only, dual-purpose, or wheat–soybean production. However, when yield or prices were above average, variable rate was profitable. Thus, variable rate liming can be profitable for these fields, but it requires either above average yields, a high value crop, or above average prices.

中文翻译：

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小麦中变率石灰的盈利能力

网格采样允许应用不同比例的石灰，并已作为生产商的成本节省进行销售。然而，很少有研究表明这种精密应用是否有利可图。以前对可变速率石灰的研究只考虑了少数领域。本文使用俄克拉荷马州和堪萨斯州的生产者提供的 111 个田地的土壤采样数据。5 年平均净现值在可变比率和均匀比率石灰之间进行比较，用于仅谷物小麦生产、两用小麦谷物和饲料生产以及小麦 - 大豆轮作。对不同的粮食价格和粮食产量潜力进行了敏感性分析。当使用俄克拉荷马州的历史平均产量和近期价格时，这 111 个田地的可变利率平均无利可图，无论是用于谷物、双重用途还是 或小麦-大豆生产。然而，当收益率或价格高于平均水平时，可变利率是有利可图的。因此，可变速率石灰对这些田地来说是有利可图的，但它需要高于平均产量、高价值作物或高于平均价格。