The pie chart below shows the main reasons why agricultural land becomes less productive. The table shows how these causes affected three regions of the world during the 1990s.

The given pie-chart delineates the factors which affect negatively the productivity of agricultural lands and the table elaborates on the indicators of

land

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degradation

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in three areas of the world

according to

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mentioned factors in1990s

Overall

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, the apparent fact is that the reason for the less productivity is over-grazing ,

in

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addition

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,addition

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the percentage of

land

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degradation

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was apex in Europe in the 1990s. First and foremost, the predominant logic of

land

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degradation

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is over-grazing nearly 35%,

nevertheless

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,deforestation fell into the second main reason with only 5 per cent behind.

Also

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, over-cultivation stood at 28%,

besides

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the indicators for other categories is 7%.

On the other hand

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, the high points of

land

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degradation

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occurred in Europe in the 1990s roughly 23%. The main basis for

land

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degradation

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was deforestation 9.8% compared to others. For Oceania and North ,America these indicators were respectively 13% and 5% during

this

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period. The noticeable feature was that over-cultivation had not any impact ,

in contrast

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, the over-grazing effect had an apex of 11.3% in Oceania.