We know that in some situations more than one nutrient may be deficient in soil like in acid soil simultaneously P,Ca,Mg and B may be deficient.But in plant the dominant nutrient deficiency may be manifested and other nutrients deficiencies may be overlapping or masked.Many times the deficiency symptoms shown by the plant or crop plants may not be so perceptible.Best course could be the plant analysis,analysis of index plant part and compare it with the existing/established criticl limits.
Deficiency symptoms will occur after the plant metabolism is already experienced losses. The symptoms are clear signals but in most case deficit in crop and plant responses are so called hidden hunger where performance is affected in absence of symptoms. The ability to balance and optimize plant nutrition usually results from soil and plant analysis and experimentation to real target goals of optimized plants. I concur with Dr Rao that multiple deficiencies are manifested but also difficult to discern with proper leaf analysis. In the case of acid environments soil infertility is caused by multiple toxicities along with deficiencies.
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