Mention three constraints explaining why cultivable waste land is not being used for cultivation at present. -Geography

Mention three constraints explaining why cultivable waste land is not being used for cultivation at present. -Geography
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The constraints are :  1. Due to human neglect, large tracts of land of U.P., Punjab and Haryana turned infertile due to salinity or alkalinity of soil.  2. Due to extensive soil erosion or waterlogging or lack of water, agricultural land of the past had to be abandoned.  3. Due to unfavorable physiographic position or deficiencies in the soil resulting from faulty agricultural practices, large tracts of land now, can not be used for agriculture.
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