<span>. built dams to provide for irrigation</span> irrigation was used to farm lands that were originally arid and semi arid<span>4. converted bad land into agricultural fields</span> <span>these bad lands otherwise ARID AND SEMI ARID were successful reclaimed through irrigation methods. </span><span></span><span>5. invented new farming methods
</span> improvements in agricultural techniques and tools bolstered the agricultural sector making it one of the important source of taxes for the dynasty.
After the nation was united, the Tang dinasty made strong efforts to mantain it that way, and one of those was to heavily support and fund agriculture, at that time food supply was on of the most important things to keep an empire running, so they developed and constructed dams to provide irrigation, found ways to convert bad land into agricultural fields and invented new farming methods, like soaking the seeds in different compounds very planting them in order for the plantation-growth rate to be more effective, they also initiated to use insecticides and pesticides which increased considerably the harvest.
Vast amounts of materials were recieved from British colonies. If they did not receive a sustainable amount of resources from their colonies, then there would be no point of colonization.