Links to various resources found on our supported websites.

Software Applications

Estimating Yield Loss from Nutrient Rate Reductions
A common question asked in unfavorable economic times is, “How much yield loss can I expect if I cut my nutrient rates?” The resources provided here offer one approach to coming up with such an estimate.

Seed-Placed Fertilizer Decision Aid
A commonly asked question is "How much fertilizer can I safely apply with the seed?". FertSeedDecisionAid was developed to help answer that question in a reasonably condition-specific manner. This easy to use decision aid is based on regression coefficients (crop stand upon fertilizer rate) that were developed in a laboratory emergence study of common fertilizers and crops and verified with published field studies when they existed. It was developed by South Dakota State University with the support of IPNI.

NURD Lite

Nutrient Uptake and Removal Database


PKalc
Are phosphorus (P) and potassium (K) nutrient additions keeping up with removal by crops? The spreadsheet PKalc v1.12 is an interactive tool that allows you to keep track of historical nutrient additions and removals for a field or field area.


Crop Nutrient Response Tool
This evaluation tool was designed to assist in interpreting results from on-farm trials; specifically, trials involving multiple rates of any added nutrient. Its main goal is to provide the best possible estimate of "optimum rate" or "most economic rate of N" (MERN) from limited data.


Hybrid-Maize
Hybrid-Maize is a computer program developed at the University of Nebraska (Lincoln) that simulates the growth of a corn crop (Zea mays L.) under non-limiting or water-limited (rainfed or irrigated) conditions based on daily weather data. Specifically, it allows the user to:

• Assess the overall site yield potential and its variability based on historical weather data;
• Evaluate changes in attainable yield using different combinations of planting date, hybrid maturity, and plant density;
• Analyze corn yield in relation to the timing of silking and maturity in specific years;
• Explore options for optimal irrigation management;
• Conduct in-season simulations to evaluate actual growth up to the current date based on real-time weather data, and to forecast final yield scenarios based on historical weather data for the remainder of the growing season.

• Translate a nutrient recommendation into the correct amounts of different fertilizers needed to make up the right amount of nutrients
• Select a combination of meaningful fertilizer sources
• Select the least costly combination of fertilizer nutrient sources based on quoted prices for fertilizer products and the cost of application, and
• Evaluate the cost of different fertilization programs.