RANA, VISHAL SLINGWAL, KUSUM2019-11-232019-11-232019-11http://krishikosh.egranth.ac.in/handle/1/5810136043ABSTRACT The present investigation entitled “Influence of seaweed extract on growth, yield and quality of strawberry (Fragaria × ananassa Duch.) under polyhouse conditions” was carried out in the experimental block of Department of Fruit Science, Dr. YS Parmar University of Horticulture and Forestryat Nauni, Solan (HP) during the year 2018-19. The Experiment was laid out in Randomized Block Design (factorial) with ten treatments consisting of seaweed extract (SWE) @ 0.75 ml/L at pre-flowering, SWE @ 1.0 ml/L at pre-flowering, SWE @ 1.25 ml/L at pre-flowering, SWE @ 0.75 ml/L at fruit set, SWE @ 1.0 ml/L at fruit set, SWE @ 1.25 ml/L at fruit set, SWE @ 0.75 ml/L at pre-flowering and fruit set, SWE @ 1.0 ml/L at pre-flowering and fruit set, SWE @ 1.25 ml/L at pre-flowering and fruit set, Control (Water Spray) and three varieties viz., Camarosa, Chandler and Winter Dawn. The results revealed that T9 (SWE @ 1.25 ml/L at pre-flowering and fruit set) recorded highest plant spread, leaf area, number of runners per plant, duration of flowering, percent fruit set, fruit length, fruit weight, total soluble solids (TSS), TSS/acidity ratio, sugars and lowest titratable acidity. Among different treatments, the highest cumulative yield per plant and Length/breadth ratio were recorded in T8 (SWE @ 1.0 ml/l at pre-flowering and fruit set). However, Number of leaves per plant, number of crowns per plant, fruit breadth and ascorbic acid were recorded highest in T2 (SWE @ 1.0 ml/L at pre-flowering). The highest anthocyanin content was recorded with T3(SWE @ 1.25 ml/L at pre-flowering). Signature of the Major Advisor SennullThesis