In macro-nutrients nitrogen, phosphorous,potassium,secondary nutrients calcium,magnesium,sulfur and in microcircuits zinc,boron, iron,molybdenum are deficient in plant.
Macronutrients can be broken into two more groups: primary and secondary nutrients. The primary nutrients are N, P, and K. These major nutrients usually are lacking from the soil first because plants use large amounts for their growth and survival. The secondary nutrients are calcium, magnesium, and S. There are usually enough of these nutrients in the soil so fertilization is not always needed. Also, large amounts of Calcium and Magnesium are added when lime is applied to acidic soils.
Micronutrients are those elements essential for plant growth which are needed in only very small (micro) quantities . These elements are sometimes called minor elements or trace elements, but use of the term micronutrient is encouraged by the American Society of Agronomy and the Soil Science Society of America. The micronutrients are B, CuFe, Cl, Mn,Mo and Zn.Recycling organic matter such as grass clippings and tree leaves is an excellent way of providing micronutrients (as well as macronutrients) to growing plants.
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Chemical plant growth retardants (PGRs) are very useful tools for controlling the height of bedding plants and despite the current aversion to chemicals, PGRs remain the first choice of most growers. The attached article outlines what chemicals are available for spring crops, how they are applied, and some of the factors which affect the success of their use.
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