Root distribution pattern of pomegranate in different soil types

摘要

Root distribution pattern forms the crux for optimum utilization irrigation, fertilizers and other inputs. Therefore, root distribution in terms of root weight and root activity (i.e. root length) in pomegranate cv. Bhagwa was studies in three different soil types on four-year-old trees of pomegranate. Roots were collected from six radial distances (0-30, 30-45, 45-60, 60-75, 75-90 and 90 cm and above) and seven depths (0-15, 15-30, 30-45, 45-60, 60-75, 75-90 and above 90 cm). It was observed that total quantity of feeder roots (diameter up to 5 mm) under shallow, medium deep and deep soil was 992.7, 1,100.0 and 1,176.3 g, respectively. Cumulative root length (activity) was the highest in medium deep soils (2,722.8 m) followed by shallow (2,332.4 m) and the lowest in deep soil (2,084.0 m). On weight basis, contribution of small roots (2 < to < 5 mm) in total weight was the highest whereas, on the basis of root length, contribution of very fine roots (< 0.5 mm) was exceptionally high compared to other categories of the roots. Root growth or root activity of pomegranate plants was better in shallow, light textured soils compared to deep, clayey soils. In these soils major portion of the root activity was observed in 0-60 cm radial distance and 0-45 cm vertical distance. In deep, clayey soils more or less uniform distribution of roots was observed up to 90 cm distance.