Collectively, these factors have led farmers to question whether micronutrient fertilization may now be required to meet the changing demands of crop nutrition. The Tri-State Fertilizer Recommendations state that in general, soils in Michigan, Indiana and Ohio have adequate amounts of micronutrients to support crop growth. The only reported micronutrient deficiencies in this region have been with B, Cu, Mn and Zn. These deficiencies can cause plant abnormalities, reduced growth and sometimes yield losses. Over the past 40 years, there have been ongoing efforts to evaluate the effect of micronutrient fertilization on field crop yields. Here we have compiled all available studies conducted by Ohio State University which examined the effect of micronutrient fertilization on field crop yields in Ohio.

Understanding plant nutrition can be the difference between vigorous, productive plants and plants that struggle. You may be familiar with the macronutrients like nitrogen or potassium. These are the most commonly discussed nutrients since they are needed in the largest amounts.However, they aren’t the only essential nutrients that your plants need. Your plants will also need micronutrients in order to thrive.

Plants are able to produce their own food through a process called photosynthesis. They absorb nutrients through their roots from the soil and is transported through the stem to the different parts that are above ground level. They require two types of nutrients- macronutrients and micronutrients. 

We all know the nutrients — nitrogen, phosphorous, potassium, magnesium, calcium, sulfur — that are important for plants. We call them macronutrients. But there’s a whole list of plant micronutrients that are also essential, in much smaller quantities, to the health of your plants. These micronutrients — boron, iron, zinc and others — not only assure healthy growth, they help your gardens fight off pests and diseases.The best long term way to keep your garden soil rich with the micronutrients it needs is by adding organic compost. The living things that go into compost — grass clippings, leaves, plants trimmings, table scraps — already contain various amounts of micronutrients. Their presence in your compost guarantees that you’re returning those micronutrients to the soil.

Western Canadian crops require 17 essential nutrients to grow normally. Carbon, hydrogen, and oxygen derived from the air comprise more than 90 per cent of the fresh plant tissue. Macronutrients derived from the soil and needed in large amounts are nitrogen (N), phosphorus (P), potassium (K), sulphur (S), calcium (Ca), and magnesium (Mg). Legumes are the exception because they fix N from the air. With a few exceptions, Ca and Mg are not limiting in Saskatchewan because of the nature of the soils. The soil supply of N, P, K, and S is often supplemented by fertilizer and manure.The remaining essential nutrients derived from the soil are referred to as micronutrients, because they are needed in small amounts. They are boron (B), chloride (Cl), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), nickel (Ni) and zinc (Zn). Micronutrients are important for plant growth, as plants require a proper balance of all the essential nutrients for normal growth and optimum yield.

Micronutrients are essential for your plants, says Tricia in our video about secondary macronutrients and the micronutrients. You know about the major nutrients, N-P-K. Those are the symbols for the building blocks: nitrogen, phosphorus and potassium. They're represented by the three numbers on the front of fertilizer boxes or bags.For more about them, check out our video here. With the lesser known micronutrients (like “molybdenum” -- if you can spell that you can probably win a Spelling Bee) you’ll need a lab soil test to know if any need to be added to your soil.Let’s have a quick look at the major mineral nutrients, and then get to know the micronutrients and find out what they do for your plants.

A pH of 7.0 in neutral on the pH scale of 0 to 14. Micronutrients tend to be more available when the pH is 7 to 7.5, which is slightly alkaline, while macronutrients prefer a pH between 6.2 to 7.0, which is slightly acidic.Understanding each micronutrient mineral element’s function in plant growth will help you to determine the right nutrient applications and diagnose any potential crop production problems.

Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture, Beijing 100081, China

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