Effects of root pruning on seedling growth and other parameters in Juniperus polycarpos under nursery condition

P. Negi, Sandeep Sharma, N. Thakur
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Abstract

A nursery trial was conducted to study the effects of root pruning on the seedling growth and other parameters of Juniperus polycarpos. Roots of two-year-old seedlings of J. polycarpos were pruned at different levels and transplanted in polybags of size 9’’ × 5” filled with potting media comprising soil, sand, and farm yard manure (2:1:1). Maximum growth of various seedling parameters, viz., shoot length (42.90 cm), root length (38.40 cm), collar diameter (6.16 mm), number of roots (45.93) and biomass, viz., fresh shoot biomass (24.03 g), fresh root biomass (6.35 g), total fresh biomass (30.38 g), dry shoot biomass (10.21 g), dry root biomass (2.48 g), total dry biomass (12.69 g), weight of secondary + tertiary roots (0.61 g) were recorded in seedlings in which 5 cm roots were retained after pruning, whereas, minimum growth of seedling parameters and biomass was recorded in seedlings in which no root pruning was done. The maximum value of seedling quality parameters, viz., volume index (1627.86), Quality index (1.14), and ratio of secondary + tertiary roots to total root biomass (0.08) was also observed in seedlings in which 5 cm roots were retained after pruning. The study suggests that roots of J. polycarpos may be pruned up to 5 cm in length for production of quality nursery stock.
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苗圃条件下根修剪对刺柏幼苗生长及其他参数的影响
通过苗圃试验,研究了根修剪对刺柏幼苗生长及其他参数的影响。采用不同水平的2年生木松(jj . polycarpos)幼苗根系剪枝,移栽于9”× 5”大小的塑料袋中,并填充土壤、沙子和农家肥(2:1:1)组成的盆栽介质。在修剪后保留5 cm根的幼苗中,各幼苗参数的最大生长量为茎长(42.90 cm)、根长(38.40 cm)、领径(6.16 mm)、根数(45.93)和生物量(鲜梢生物量24.03 g)、鲜根生物量6.35 g、总鲜生物量30.38 g、干梢生物量10.21 g、干根生物量2.48 g、总干生物量12.69 g)、次生+三次根重0.61 g)。未进行根系修剪的幼苗的生长参数和生物量最小。幼苗质量参数体积指数(1627.86)、质量指数(1.14)和次生+三次根与总根生物量之比(0.08)在修剪后保留5 cm根的幼苗中也达到最大值。研究结果表明,为生产优质苗木,可将松根修剪至5cm。
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