<P> The construction of water works and aspects of water technology in Medieval India is described in Arabic and Persian works . The diffusion of Indian and Persian irrigation technologies gave rise to an irrigation systems which brought about economic growth and growth of material culture . Agricultural' zones' were broadly divided into those producing rice, wheat or millets . Rice production continued to dominate Gujarat and wheat dominated north and central India . </P> <P> Sugar mills appeared in India shortly during this era . Evidence for the use of a draw bar for sugar - milling appears at Delhi in 1540, but may date back earlier, and was mainly used in the northern Indian subcontinent . Geared sugar rolling mills later appeared in Mughal India, using the principle of rollers as well as worm gearing, by the 17th century . </P> <P> Indian agricultural production increased under the Mughal Empire, during which India's population growth accelerated . A variety of crops were grown, including food crops such as wheat, rice, and barley, and non-food cash crops such as cotton, indigo and opium . By the mid-17th century, Indian cultivators begun to extensively grow two new crops from the Americas, maize and tobacco . </P> <P> Land management was particularly strong during the regime of Akbar the Great (reigned 1556 - 1605), under whom scholar - bureaucrat Todarmal formulated and implemented elaborated methods for agricultural management on a rational basis . Indian crops--such as cotton, sugar, and citric fruits--spread visibly throughout North Africa, Islamic Spain, and the Middle East . Though they may have been in cultivation prior to the solidification of Islam in India, their production was further improved as a result of this recent wave, which led to far - reaching economic outcomes for the regions involved . </P>

Who introduced cashew to india in the 15th century