Rai, RatnaMalay Samir2018-09-062018-09-062015-07http://krishikosh.egranth.ac.in/handle/1/5810072036The present investigations were undertaken at Horticultural Research Centre, Patharchatta and Post Graduate Laboratory of Department of Horticulture, College of Agriculture, G.B. pant University of Agriculture and Technology, Pantnagar to study the root distribution pattern of 14 year old sapota (Achras sapota L.) trees cv. Cricket Ball as per free monolith method of root excavation. The experiment was laid out in factorial randomized block design which was replicated thrice with one tree per replication in each season. The three factors included in the experiment were seasons (autumn, winter and summer), radial distances (0-60 cm, 60-120 cm and 120-180 cm) and depths (0-20 cm, 20-40 cm and 40-60 cm), thereby forming 27 treatment combinations. The results indicated that maximum active roots were concentrated within 60 cm radial distance from the tree trunk in the top 20 cm depth of soil from in all the three seasons. However, autumn season gave significantly higher fresh weight, volume and dry weight of active roots as compared to other seasons. The application of manures and fertilizers to the soil and water for surface irrigations should, therefore, be done within 60 cm radial distance from the tree trunk to a depth of 20 cm in all the three seasons of the year for their most efficient use by sapota trees.ennullThesis