Rational fertilizer management is crucial in the efficient use of resources that are basically non-renewable and that can have a great environmental impact when used without scientific basis. The availability of scientifically sound decision-making tools for rational fertilization is scarce. We have developed a Windows program to calculate the required seasonal N, P and K rates, and the most cost-effective combination of commercial fertilizers. The tool also provides estimates of the Ca, Mg and S balances in the field resulting from the fertilizer program chosen. Novel aspects of the calculations include the development of stochastic flexible fertilizer programs for N and the calculation of acidification and N losses. Regarding P and K, estimations are provided on the grounds of threshold values of usual availability indexes, something frequently unknown by final users. Also, it allows the users to determine the best complex fertilizer for pre-plant applications to avoid blending of simple fertilizers at the farm, a task usually complex for farmers. The application may be useful both to the fertilizer supply and demand sides. In addition, it may be used for teaching as it helps understanding the rationale behind this management practice.

中文翻译：

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FertiliCalc：肥料管理决策支持系统

合理的肥料管理对于有效利用基本上不可再生且在没有科学依据的情况下使用会对环境产生重大影响的资源至关重要。科学合理的合理施肥决策工具的可用性是稀缺的。我们开发了一个 Windows 程序来计算所需的季节性 N、P 和 K 比率，以及最具成本效益的商业肥料组合。该工具还提供对所选施肥计划产生的田间钙、镁和硫平衡的估计。计算的新方面包括开发用于 N 的随机灵活施肥程序以及酸化和 N 损失的计算。对于 P 和 K，根据常用可用性指标的阈值进行估计，最终用户经常不知道的东西。此外，它允许用户确定种植前应用的最佳复合肥料，以避免在农场混合简单肥料，这对农民来说通常是一项复杂的任务。该应用程序可能对肥料供需双方都有用。此外，它还可以用于教学，因为它有助于理解这种管理实践背后的基本原理。