* Fertiliser stocks including Chambal Fertilisers and Chemicals Ltd
extend gains after the government raised the price of the most used nitrogenous fertiliser urea by 50 rupees per tonne on Thursday. * However, traders say the hike was way below expectations, translating to less than 1 percent. * "The hike would in no way support the margin improvement for fertiliser maker, the next trigger would be the new urea investment policy expected to get approved later this year," said a senior manager at a local brokerage. * Rashtriya Chemicals & Fertilizers gains 5.7 percent while Chambal Fertilisers and Chemicals Ltd gains 4.7 percent.