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Citrus is a perennial fruit crop which is highly responsive to nutrient applied and thus require adequate amount of nutrition for obtaining optimum growth and yield. In recent years, it has been observed that organic in combination with inorganic sources of nutrient have gained popularity due to the negative impact of excessive use of chemical fertilizers on soil and environment. The experiment was conducted with seven treatments and three replications consisting recommended dose of fertilizers (RDF) and RDF in combine with Organic manure and Vermicompost at different percentage during the year 2019. The treatment, T4 with 60% N of RDF + 40% N from FYM (farm yard manure) gave the best result in improving plant growth and yield. The maximum plant height increment (15.04%), highest percentage in canopy spread increment, North-South (22.17%) and East-West (20.35%), maximum fruit set percentage (37.78%), highest number of fruits (40.22) per plant and maximum yield (8.52 kg) per tree were recorded from T4 (60% N of RDF + 40% N from FYM) which indicated that the application of 60% N of RDF + 40% N from FYM may be recommended to obtain maximum yield and best quality fruit in Assam lemon.

The annual increase in global population of 1.1% necessitates increased agricultural yields to provide a sustainable food supply, which necessitates the extensive use of chemical fertiliser and pesticide. This practise, however, causes a number of environmental and health issues, which ultimately drives the creation of safer organic fertilisers and bio-pesticides. Organic fertiliser comprises various antioxidants and carbonaceous matter, which are inexpensive and safe elements utilised for plant growth. While inorganic fertiliser is typically made entirely, such as sulphate of ammonia, they may also be processed from quarries. One must need to develop other sustainable alternative to meet the demand of world's expanding population, thereby meeting the SDGs of poverty eradication, zero hunger, and climate action.One possible technique is to use fruit peels as biofertilizers and bio pesticides. Fruit peels are often discarded in the garbage and taken to a solid waste dumping facility. Because of the breakdown of peel material at the disposal location, this generates an odour problem. Ergothis is critical for establishing the peel as a significant bio resource in worldwide organic agriculture development, reducing solid waste accumulation in the environment with its attendant public health threat, and documenting a long-term management technique. Fruit peels are high in nutrients such as potassium, calcium, iron, zinc,calcium, citrate content, and other minerals.