Dimri, D.C.Raj Kumar2019-06-142019-06-142004-07http://krishikosh.egranth.ac.in/handle/1/5810108476The present investigation entitled as above was carried out during the year 2003-04 at Experimental Block of Department of Horticulture, G.B. Pant University of Agriculture & Technology, Hill Campus, Ranichauri, Tehri Garwhal, Uttaranchal. Total three experiments were conducted on old and unproductive orchard due to their poor management with respect to pruning and nutrient supplementation. The investigation was carried to study the rejuvenation of old and unproductive trees of apple cv. „Red Delicious‟. The findings revealed that with the increase in severity of pruning, the maximum extension of shoot length (52.07 cm) and shoot girth (0.74 cm), while minimum tree trunk diameter (21043 cm) was recorded. Severe pruning also resulted in to drastic reduction in mean bloom density (20.85%) and fruit drop (31.91%) for the year 2003 and 2004. The increase in nitrogen level through soil application enhanced shoot length (37.87cm), shoot girth (0.52 cm) and trunk diameter (14.36 cm) was observed under 1400 g N/tree. The highest mean bloom density of 34.28% was noticed with maximum level of nitrogen i.e. 1400g N/tee. However, the two years study on final fruit retention showed the highest value of 47.52% under 799 g N/tree treatment. The highest estimate of leaf N content was noticed under 1400 g N/tree (2.93%), whereas (1.91%) under control in the month of July. An increase in available N status of soil was found with the increasing trend in nitrogen level i.e. (285.32 ppm) under 1400 g N/tree. The observations in respect of shoot length and leaf N content attributes a influenced by different level of urea spray were recorded. The maximum shoot length of 39.61 cm was measured under 2.0% urea spray as compared to 19.27 cm, and increase in leaf N status i.e. 3.21% with increasing urea concentration i.e. 2% urea were observed in the month of June. Thus, the best results were obtained by application of severe pruning techniques along with fixed dose of N @ 1050g N/tree through soil application and in the form of foliar spray of urea @ 2.0%. Repetition of treatments for 3-4 years continuously is however suggested to arrive at a concrete and precise result to maximize return in terms of yield and quality of fruits.ennullThesis