KANWAR, H.S.HIMANGINI2018-05-192018-05-192018-05http://krishikosh.egranth.ac.in/handle/1/5810046749ABSTRACT The present investigation, “Studies on the integrated use of Nitrogen and Potassium fertigation with Boron spray on seed yield and quality of Onion (Allium cepa L.)” was carried out at the Pandah experimental farm and laboratory of the Department of Seed Science and Technology, Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni, Solan-173230 (H.P.) during two consecutive years (2014-15 and 2015-16). One experiment was laid in field in Randomized Block Design (Factorial) with 20 treatments and three replications. Disease free, healthy, uniform sized bulbs of about 60-65 g in weight were selected and were planted at a spacing of 45 x 30 cm in 60 plots of 1.5 m X 1.2 m. Three fertigation levels with 10 different combinations along with 0.1% Boron foliar spray were tried. Second experiment was laid out in laboratory in Completely Randomized Design (Factorial) with 20 treatments and four replications. The effect of NK treatment and Boron spray on plant and seed quality attributes and its effect on storage quality of seeds for 8 months were observed and recorded. Analysis of variance showed significant differences among the treatment combinations for all the characters studied. Non significant differences of available soil NPK, soil pH, organic carbon (%) and soil electrical conductivity. The fertigation treatment combination of N100K100 along with Boron (@ 0.01%) foliar spray before flowering performed well for all the plant and seed quality attributes. Therefore, can be recommended for commercial seed production of onion.ennullThesis