at the plant on the right again (it is the same one above). It is
clear that it is not growing as fast as the one on the left.
Something is wrong, but what? There is no sign of nutrient
deficiency, no disease or pest and they were grown under the same
illustrates one of the main problems in diagnosing nutrient problems
by visual inspection. In the vast majority of cases, nutrient
deficiencies can substantially reduce production without
showing any clear symptoms. This problem is referred to as
"hidden hunger". (By the way, the plant on
the right is deficient in potassium)
deficiency symptoms are sometimes seen, it is often too late to
correct the problem, especially with short term crops. Correctly
identifying the deficiency symptoms can be difficult if multiple
deficiencies occur at the same time. Visual diagnosis of crop
growth, if correct can help in future management but is at best a
much less efficient way of solving crop production problems.
Visual Symptoms to Determine Fertilizer Needs
is wrong with this plant?
simply looking at it, we may say that nothing is wrong.
is no yellowing, no abnormal growth.
you saw this plant in the field, you may not want to apply any
special treatment to it.