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Study on the Physiological Growth Parameters in Clonal Tea

M. Aslam Ali
BTRI

A. F. M. Badrul Alam
BTRI

M. Shahiduzzaman
BTRI

Abstract/ Executive Summary:

A series of physiological growth parameters, viz. total dry matter production, leaf expansion rate, relative growth rate and photosynthetic performance were estimated through destructive harvest method in nine clonal plants. This study shows that the clones TV19, BT10, TV23 and TV18 are near about similar in terms of dry matter production, total leaf and canopy area formation and photosynthetic efficiency. On the other hand, clones BT5, BT6, BT7, BT8 and BT9 could be included in another category regarding their nursery rooting, canopy architecture, relative growth rate and photosynthetic performance.

Keywords: Growth analysis, Relative growth rate, Net assimilation rate, Leaf area ratio.

Location: BTRI Farm nursery

Start Date: 00-04-1995

End Date: 00-07-1995

Program Area: Variety and Species

Commodity: Tea

Objectives:

To explain the physiological growth parameters of some popular BTRI clones, e.g. BT5, BT6, BT7, BT8, BT9, BT10 along with three Tocklai clones, TV18, TV19 and TV23, which somehow are available in tea estates.

Methodology:

This experiment was conducted at BTRI Farm nursery in April, 1995 and continued for about 56 weeks. The experiment was laidout in a completely randomized block design with three replications. Nine clonal tea, six BTRI clones (e.q. BT5, BT6, BT7, BT8, BT9 and BT10) and three Tocklai varieties (TV18, TV19 and TV23) were selected to compare their relative growth patterns and photosynthetic performance. The clonal saplings were raised into polythene sleeves (23 cm in length, 15 cm flat diameter and 0.04 mm thickness). The soil (sandy loam) used in polybag was sieve through a 8-10 mesh sieve and mixed thoroughly with decomposed cowdung in the ratio of 3: 1 (soil plus cowdung). The pH of the soil was around 5. The bags were filled uniformly without any air pocket but leaving top 5 cm of the bag vacant for sub soil Watering was done to settle the soil particles in polybags and kept under shade (Lathe Frame) for about 15 days before putting the cuttings. Fresh nodal leaf cuttings were collected from the mother tea bushes, Bilashcherra Experimental Farm Each cutting consisted of one full leaf and a dormant axially bud with a stalk of about 2.5 cm 0 length. The planting w.as done on the basis of one cutting in each polythene at a angle of 45 with the soil surface. No air pocket was allowed to remain around the cuttings and the leaf was not allowed to touch the soil surface. Cultural operations like, weeding, forking and watering were done regularly. The time of first harvest was decided at twenty weeks after planting, considering the growth parameters viz. bud sprouting, leaf expansion rate, length of stem and callusing etc. The subsequen harvests were made at four weeks intervals. Three plants were randomly selected fro each clonal group. As there were three replication, therefore nine plants wen harvested from each clonal population during every harvesting time. A series of growth measurements were recorded during every harvest viz., total leaf area, fresh and dry weight of leaf, stem and root samples. Leaf area was measured by punched disc method using a cork borer. At each harvest plants were divided into leaf stem and root with a sharp knife, To recover roots, soil plus roots were soaked in a trough containing water. By gen agitation the soil was shaken off from the roots, The tiny portion of the roots which we detached during cleaning was recovered from the trough through sieving, The roots were further cleaned by carefully picking them out and the excess water was blotted against blotting paper and then the roots so received were weighed for raw weight. The dry weight of different plant parts were taken (By electric balance) after oven drying the materials at 80? till they attained constant weight. Ten harvests were made in total and various growth attributes were calculated by applying classical growth analysis technique.

Source of Information: Tea Journal of Bangladesh, Vol-33, No-(1-2)1997

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

This study shows that the clones TV19, BT10, TV23 and TV18 are near about similar in terms of dry matter production, total leaf and canopy area formation and photosynthetic efficiency. On the other hand, clones BT5, BT6, BT7, BT8 and BT9 could be included in another category regarding their nursery rooting, canopy architecture, relative growth rate and photosynthetic performance.

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