Perennial crops survive for 40-50 years in tandem , without experiencing any decline in productivity . But , many a times , this is not the case , for eaxmple , apple , pear, peach , tea and many more crops over the years experience negative rhizosphere effects , with the result , crop performance starts declining . Eventually , crop either survives with reduced performance or perishes for ever. In this background , i have few querries , need your threadbear responses :

*What are the underlying processes leading to negative rhizosphere effect?

* What is the resultant effect of negative rhizopshere effect?

* What kind of crops get exposed to negative rhizosphere effect more often than not?

*Do you feel, negative rhizopshere effect is responsible for reduced crop perfformance?

* Do you feel , somewhere , such negative rhizosphere effect is responsible for loss of biodiversty?

* What the long term implications of negative rhizosphere effect on soil fertility or carrying capacity of soil ?

My thanks n great regards

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