Are phosphorus fertilizer legal agriculture iowa

Is phosphorus still used in fertilizers?

It should be noted that, while phosphorus is being drastically reduced or eliminated in most fertilizers, it is still allowed in products focusing on new turf establishment or, in some cases, damage repair.

What is rock phosphate fertilizer?

Rock phosphate is mined and treated to produce various forms of phosphorus fertilizer. Commonly used in the liquid form in fertilizer blends and when the fertilizer is placed near the seed.

Should phosphorus be eliminated from native soil?

On the positive side, supporting the current rationale for eliminating phosphorus, is the fact that most native soils do contain a reasonable and hopefully sufficient amount of plant-available phosphorus.

Why do we band phosphorus fertilizer in the soil?

Placing phosphorus fertilizer in a band in the soil limits contact between soil and fertilizer, which can reduce fixation in the soil.

Is phosphorus fertilizer banned?

PHOSPHORUS FERTILIZER BANS At least 11 states ban phosphorus fertilizer use or sale: Illinois, Maine, Maryland, Michigan, Minnesota, New Jersey, New York, Vermont, Virginia, Washington, and Wisconsin.

Is it legal to have phosphorus?

It is unlawful for any person knowingly or intentionally to possess or distribute red phosphorus, white phosphorus, or hypophosphorous acid, knowing, or having reasonable cause to believe, these substances will be used to illegally manufacture methamphetamine.

Do farmers use phosphate fertilizer to their fields?

Phosphorus is a non-negotiable requirement for life. It’s the backbone of DNA and the P in ATP—the molecule that carries energy around cells. Plants need phosphorus to grow, which is why farmers have been feeding it to their crops for millennia.

Do I need a license to apply fertilizer in Iowa?

Each place of manufacture or distribution from which fertilizer or soil conditioner products are sold or distributed in Iowa must obtain a Fertilizer License and register your products.

Where is red phosphorus illegal?

To make hydriodic acid, red phosphorus is combined with iodine in the procedure. However, red phosphorus is illegal to import, export, purchase, or sell iodine crystals in the United States if they are used or intended to be used in the production of methamphetamine.

Is white phosphorus illegal?

The use of white phosphorus is not outright banned under international weapons law. It is not illegal for militaries to possess it, and armed forces around the world (including U.S. troops) have said they use it to mark a target or create a smokescreen, according to David E.

Is phosphorus used in farming?

Phosphorus (P) is one of the key essential elements in modern agriculture. Fertilization of crops comprises the largest proportion of P used in agriculture. Phosphorous use has become increasingly prevalent during recent decades due to its depletion in soils used for crop and hay production.

How do farmers get phosphorus?

On farms, phosphorus arrives in the form of fertilizer or manure for crops. Most of this phosphorus is destined for farm soils. Another source of phosphorus comes through farm animals. The forages that they eat are plants – that contain phosphorus.

Which fertilizer is high in phosphorus?

Fertilizers that are high in phosphorus include mushroom compost, hair, rock phosphate, bone meal, burned cucumber skins, bat guano, fish meal, cottonseed meal, worm castings, blood meal, manure, and compost.

Why is ag important to Iowa?

Production agriculture and ag-related industries directly and indirectly employ one of every six Iowans (or 17 percent of the state’s workforce), based on 2007 Census of Agriculture data. They also are responsible for adding $72.1 billion to the state’s economy, or 27 percent of the state’s total.

What kind of crops are grown in Iowa?

Iowa’s main agricultural products are corn (maize), soybeans, hogs, and cattle, and Iowa ranks among the leading states in the production of the first three commodities. Viticulture is of growing importance to the state, which has hundreds of commercial vineyards.


Soil phosphorus and potassium dynamics and management. A.P. Mallarino. 2020. Soil fertility and nutrient management short course. Iowa State University Extension and Outreach, Ames.

Conference Proceedings and Reports

Mallarino, A.P., 2019. Phosphorus and potassium fertilizer placement options when crop prices are low. p. 123-130. In 31th Integrated Crop Management Conf. Proceedings. Dec. 4-5. 29-30, 2019. Iowa State Univ. Extension.

Will P and K be applied again in 2020?

If P and K was applied, producers will not need to apply again for 2020 as long as volunteer weeds or seeded cover crops were not harvested for hay or silage and there was not severe erosion by rainfall or flooding.

Is fertilization good for soil?

In soils testing Very Low, economic benefit from fertilization are very high and very likely for all price scenarios. In low-testing soil benefits are lower but likely and most of the time well above break-even (zero return), even with lower grain prices than today.

Is soil testing a diagnostic tool?

Soil testing is not a perfect diagnostic tool, but research has shown that crop yield increases from P and K fertilization are large and likely with test results in the Very Low and Low interpretation categories, small and less likely in the Optimum category, and very unlikely in the High and Very High categories.

Importance of Phosphorus

Phosphorus is one of three macronutrients essential for plant growth. It plays critical roles in photosynthesis, respiration, and energy storage and transfer. Phosphorus is also a component of DNA and is involved in cell division.

Measuring Phosphorus

Analyses of phosphorus fertilizers are typically reported as percent P 2 O 5, a phosphate form that is not actually present in fertilizers, but is used as an industry standard measure. In a standard fertilizer analysis, the second number is the percent of P 2 O 5 by weight in the fertilizer.

Forms of Phosphorus Fertilizers

Phosphorus fertilizers are produced from mined phosphate rocks. Rock phosphate is insoluble in high and neutral pH soils and must be dissolved with acid before it can act as an active ingredient in fertilizers. Many phosphorus fertilizers are rock phosphates that have been treated with acid, as shown in Figure 1.

Preparing for Phosphorus Application

Spring application is just as efficient as applying in the fall, unless soil test levels are in the very low range.


Placing phosphorus fertilizer in a band in the soil limits contact between soil and fertilizer, which can reduce fixation in the soil.


Phosphorus is more likely to fix in the soil and become unavailable to plants when it is broadcast.

Is phosphorus in fertilizer?

It should be noted that, while phosphorus is being drastically reduced or eliminated in most fertilizers, it is still allowed in products focus ing on new turf establishment or, in some cases, damage repair.

Does phosphorus reappear on lawn fertilizer labels?

At present, the longer-term impact is simply not known. With current data in mind, it is doubtful phosphorus will ever re-appear on all turf fertilizer labels.

Is phosphorus in lawn fertilizer banned?

In at least 11 states, from Wisconsin and Minnesota to Virginia, phosphorus in turf fertilizers for home lawns has been either limited or banned altogether.

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