Law of minimum is the law that states that if one of the essential plant nutrients is deficient, plant growth will be poor even when all other essential nutrients are abundant. Simply, the scariest resource dictates the growth not the available in large amount. This was developed in agricultural science by Carl Sprengel (1840) and popularized by German scientist Justus von Liebig.
By increasing the amount of the limiting nutrient (the one most scarce in relation to "need") was the growth of a plant or crop could be improved. The image of barrel has been used by Dobenecks to explain it. The maximum practical capacity of a barrel with staves of unequal length is limited by the length of the shortest stave. Similarly, a plant's growth is limited by the nutrient in shortest supply.
In real agricultural settings, N, P or K are not only fully responsible for the plant's growth. Addition application of the micronutrient or secondary nutrient fertilizers are equally necessary. For instance, Mg deficient can be equally distress the plants even after sufficient NPK application. Applications of potash (potassium) fertilizers has found to reduce a plant’s ability to absorb Mg.
In its applications, optimum application of the fertilizers results the maximum yield, lessening the negative effects of any minerals.
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