Advance in agriculture in 19th Century
- Mitscherlich (1909) proposed the “Law of diminishing returns” that increase in growth with each successive addition of the limiting element is progressively smaller and the responsive is curvilinear.
- Wilcox (1929) proposed “Inverse yield-nitrogen law”. It states that the power of growth or the yielding ability of any crop plant is inversely proportional to the mean nitrogen content in the dry matter.
- Macy (1936) proposed the theory of “ Macy - Poverty Adjustment”. It states that a relationship exist between sufficiency of a nutrient and its percentage content in plant.
- According to him there is a critical percentage of each nutrient in each kind of plant. Above that point, there is luxury consumption and below that point there is poverty adjustment. This poverty adjustment is proportional to the deficiency until a minim.
