SHANGHAI: President Asif Ali Zardari Monday stressed the need for better irrigation methods to conserve water as it was a precious commodity, which must be used judiciously. Talking to Board Chairman, Xinjiang Tianye Water Saving Irrigation System, Guo Qingren, who called on the President here at his hotel suite, Zardari was briefed about various irrigation methods in Xinjiang province. Afterwards, Pakistan and China signed two MoUs one on drip irrigation and the other on cooperation in BT Coloured cotton. The MoUs were signed by Dr. Zafar Altaf from Pakistan side and Guo Qingren and Director General of Xinjiang Tianye Water Saving Irrigation System Zhang Qi Quang. President Asif Ali Zardari also witnessed the signing ceremony.