Debunking Manure Myths: Facts for Effective Nutrient Management

By Andi Anderson

Manure management plays a vital role in agricultural practices, yet misconceptions about its effectiveness persist. Here, we dispel common myths surrounding manure application, shedding light on its true value in nutrient management and crop production.

Myth #1: Winter-Applied Manure Lacks Nitrogen for the Next Crop Reality: Contrary to belief, winter-applied manure retains nitrogen value, especially when spread during cold weather with moist soil conditions. As temperatures rise in spring, nitrogen becomes available to the next crop, contributing to its growth.

Myth #2: Manure Spread in Spring Isn't Available to Summer Crops Reality: Nitrogen in manure, including both ammonium-N and organic forms, becomes accessible to crops as soil temperatures increase. Even surface-applied manure releases organic nitrogen, supporting early crop vigor. Balancing manure application with supplemental fertilizer can optimize yields.

Myth #3: Manure Nutrient Content Is Too Variable Reality: While nutrient variability exists, agitating manure before application improves nutrient uniformity. Conducting manure analysis during pit emptying allows adjustments to application rates, maximizing nutrient utilization.

Myth #4: Manure Nitrogen Isn't Plant-Available Reality: Crops utilize nitrogen from manure in various forms, just like from synthetic fertilizers. Whether organic or ammonium, manure nitrogen converts to available forms for plant uptake.

Myth #5: Manure Isn't a Reliable Nutrient Source Reality: Manure is a valuable nutrient source, credited against fertilizer recommendations. Liquid manure systems provide nitrogen, phosphorus, and potassium, benefiting soil health and crop yields when applied correctly.

To optimize manure benefits, adhere to nutrient management plans and calibrate application equipment. For expert guidance on nutrient management or manure application, consult with professionals like MSU Extension educator Sarah Fronczak.

Enhance your understanding of manure management to maximize its benefits for soil health and crop productivity.