Shant LalThakre, Madhubala2016-07-232016-07-232011-03http://krishikosh.egranth.ac.in/handle/1/69583Thesis-PhDThe present investigation was carried out at Horticulture Research Centre, Patharchatta, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, during 2009-10 to 2010-11 to find out suitable and economical method of crop regulation in guava cv. Pant Prabhat under double hedge row system of planting for tarai. The treatments were consisted of seven treatments viz. flower bud thinning by hand (T1); flower bud thinning by hand followed by removal of terminal one leaf pair (T2); removal of leaves and flower buds by hand, retaining one leaf pair at the top of shoot (T3); removal of all leaves and flowers by hand (T4); one leaf pair shoot pruning, retaining one leaf pair at the base of the shoots (T5); full shoot pruning (T6); one leaf pair pruning of fruited shoots only (T7) and control (T8). The experiment was laid out asper Randomized Block Design. Each treatment replicated four times. The treatment T7 (one leaf pair pruning of fruited shoots only) gave minimum annual increase in tree height, trunk diameter, tree spread and tree volume. All the treatments were superior to control with respect to regulation of crop and recorded more winter season yield as compare to rainy season. The treatment T7 (one leaf pair pruning of fruited shoots only) had maximum number of flower buds per branch, number of fruits per tree, yield per tree and yield per hectare. The treatment T7 also gave higher value for per cent fruit set and lower value for per cent flower/ fruit drop. The treatment T7 was also superior in terms of total soluble solids and ascorbic acid content during winter season. In general, winter season fruits were superior as compare to rainy season fruits with respect to total soluble solids, ascorbic acid, total sugar, reducing sugar, non reducing sugar and pectin content. The nitrogen, phosphorous and potassium content of guava leaves revealed that none of the treatments affected the nitrogen, phosphorous and potassium content of guava leaves significantly. The maximum cost: benefit ratio was recorded with the treatment T7 (one leaf pair pruning of fruited shoots only) followed by the treatment T5 (one leaf pair pruning). On the basis of results, it can be concluded that to regulate cropping pattern of guava cv. Pant Prabhat and to get profitable production of guava under tarai conditions, the one leaf pair pruning of fruited shoots only should be done in the last week of April under double hedge row system of planting.encrop regulation, horticulture, guavas, Psidium guajava, planting methods, pruning, cropping patternsThesis