The symptoms observed on your Kinnow mandarin tree, such as mottled yellowing, interveinal chlorosis (yellowing between green veins), and uneven discoloration, strongly suggest the presence of Huanglongbing (HLB), also known as citrus greening disease. This condition is caused by the bacterium Candidatus Liberibacter asiaticus, which is transmitted by the Asian citrus psyllid. The irregular and asymmetrical yellowing patterns distinguish HLB from nutrient deficiencies like zinc or iron, which typically cause more uniform and symmetrical leaf yellowing. Since HLB is prevalent in Punjab's citrus orchards, confirmatory testing through PCR diagnosis is advisable. While there is no cure for HLB, managing the psyllid population, removing severely affected trees, and providing balanced nutrition can help slow the disease's progression and prolong tree productivity. Regularly monitor the plant for Asian citrus psyllid (ACP), which transmits the disease, and control it using insecticides or natural enemies like Tamarixia radiata. Strengthen the plant by providing balanced nutrition, especially zinc, manganese, and iron, to enhance its defense and delay symptoms. If some branches are heavily infected, prune and remove them carefully, ensuring tools are sterilized to avoid spreading bacteria within the plant. In severely affected plants, complete removal may be necessary to protect surrounding healthy trees.

It's hard to say and rely solely on those. Surely, you have another problem here, mixed with some that are consistent with HLB. However, those are not entirely caused by the bacteria. Good luck