Plantation crop originally introduced for soil conservation is

The plantation crop originally introduced for soil conservation is the cashew nut.
Plantations are a type of commercial farming where a single crop of tea, coffee, sugarcane, cashew, rubber, banana, or cotton is grown. The produce may be processed on the farm itself or in nearby factories.
In the Cashew cultivation process, the cashew is generally planted on the wastelands and hence the availability of soil moisture is always low, hence, mulching is essential. Mulching with black polythene is beneficial to increase the growth and yield of cashew.