Onion ( Allium cepa L.Var. aggregatum Don.) is one of the most important bulb vegetable crops grown in India and around the globe. The recent string in solarization is combining it with organic amendments like animal waste and plant residues that are capable of producing toxic volatiles. During the process of solarization with amendments, bio toxic volatile compounds are released when organic matter is heated. Such a treatment was reported to result in certain physical, chemical and biological changes that favour plant health and growth while producing deleterious effect on weeds, pathogens and pests and also increasing the nutrients availability of the soil and crop uptake. Hence an experiment was conducted to find out the influence of soil solarization after amending the soil with various bulky organic manures and concentrated oil cakes. The experiment was laid out in a randomized block design with 14 treatments replicated thrice. The treatments include a combination of solarization for four weeks with three different amendments viz., Vermicompost ( 5 t ha-1), Farm Yard Manure (FYM)( 12.5 t ha-1), and neem cake(1 t ha-1) along with non solarized control and solarization without amendment. The results of the experiment revealed that solarization treatment with vermicompost and neem cake was found to be effective in increasing the soil temperature in all depths and on all days of observation and significant increase in the available nutrients of soil. The chemical and biological properties of onion field were found to be the best in the treatment combination of solarization for 4 weeks with vermicompost @ 5 t ha-1, neem cake @ 1 t ha-1, consortium bio fertilizers @ 2 kg ha-1 and foliar application of panchakavya @ 4 % sprayed 4 times and it could be adjudged as the best treatment combinations for maximizing the productivity of onion.
