<P> Agriculture in Liberia is a major sector of the country's economy worth 38.8% of GDP, employing more than 70% of the population and providing a valuable export for one of the world's least developed countries (as defined by the UN). Liberia has a climate favourable to farming, vast forests, and an abundance of water, yet low yields mean that over half of foodstuffs are imported, with net agricultural trade at - $73.12 million in 2010 . This was dismissed as a "misconception" by Liberia's Minister of Agriculture . </P> <P> The major crops are natural rubber, rice, cassava, bananas and palm oil . Timber is also a major export at $100 million annually, although much of this is the product of unsustainable habitat destruction, with Asian corporations criticised for their role . Although agricultural activity occurs in most rural locations, it is particularly concentrated in coastal plains (subsistence crops) and tropical forest (cash crops). The sector is very important for women as they are widely employed in it in comparison to the economy as a whole . </P> <P> Deys, Bassa, Kru, and the West Atlantic Gola and Kissi, are likely to be the first inhabitants of the region of present - day Liberia . Their migration was caused by the decline of the Malian Empire in 1375 and Songhay in 1591 . Favourable arable land in comparison to their homelands also brought them in the area . Alongside their social and cultural customs, these immigrants also took with them rice, tuber and cotton cultivation . Evidence for this comes from early European merchants, such as Pedro de Cintra, who arrived in 1461 . </P>

What are the chief commercial tree crops of liberia