What was the jagirdari crisis? How was it responsible for the decline of the Mughal Empire?

Jagirdari crisis refers to a crisis that emerged due to the enormous increase in the number of mansabdars to be assigned jagirs. As adequate number of jagirs were not available, a lot of crown land was converted into jagir land. This reduced the revenue share of the emperor and led to the further decline of his power. Another important consequence was that the uncertainty about mansabdars' income from their jagirs weakened the numerical strength of the army as number of troops to be maintained by each mansabdar was determined by the salary and allowances (paid through jagirs) attached to his mansab.