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Research Detail

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Mr. K. Rahman
Department of Soil Science, Dhaka University, Dhaka.

Mr. M. H. Rashid
Department of Soil Science, Dhaka University, Dhaka.

Mr. M. A. Mannan
Department of Soil Science, Dhaka University, Dhaka.

Mr. M. A. Sobhan
Department of Soil Science, Dhaka University, Dhaka.

The highest number of leaves, height, girth and survival rate were  achieved in B1, B4, B4 and  B1 blocks, and those of lowest values recorded in B3, B2, B3 and B3 blocks, respectively. Generally two-whorled fully hardened polybag budded stumps are planted in the field in our country.   But it was revealed from  the experiment that the polyhag grafted rubber seedling is suitable for plant­ ing just after sprouting the shoots. The shoots should not be allowed to grow more than 2.54 cm long in the nursery. This tech­nique saves planting time, expenditure  as well as 'supplying' vacancy filling could be achieved quickly if any casually arises.

  Soil, Planting technique, Polybag grafted, Rubber seedling
  Tarakhown Rubber Estate, Chittagong
  
  
  Seed Technology
  Rubber wood

To find out a more suitable planting technique for polybag grafted rubber seedlings

The size of the polybag was 45.72x30.48 cm. There  were  30 perforations at  the  lower 30.48 cm of the bag.  The bags were filled with top soil (0 - 15 cm) of fine tilth. TSP was added  at the rate of 14 g per polybag together with soil. After  filling, the bags were arranged in twin rows with 45 cm paths between pairs of rows. One pre-germinated seed  of local  T-1 clone was transplanted in each  polybag. Weeding and  watering  were  done  as re­quired.  Urea, TSP and murate of potash were applied at the ratio of 4:3:2, respectively. Fertilizer was split @ 7, 7, 7, 14, 14, 14 and 14 g per seedling at the age of 2, 4, 6, 10, 14, 18 and 22 weeks, respectively. Fertilizer was also applied at the rate of 14 g per see­dlings with 4 weeks intervals before one month of budding. Nine months old seedlings (2.03  cm diameter) were grafted with the help of yielding clones. Successful bud grafts were cut back after 21 days and the stumps were planted in the field just after sprouting  the shoots. Fertilizer was split @ 56 and 84 gin the month of July and September,  respec­tively on per plant basis. The analytical data showed that the pH of the soil was 4.5, organic carbon 0.93%, and C.E.C. 11.75 meq/100 g.  The monthly average rainfall at Tarakhown Rub­ber  Estate  from June  to  November, 1986 were 4555, 7730, 4520, 2910, 2970 and 2205 ml, respectively.

  Bangladesh J.Soil Sci. 21(1):71-72,1990, ISSN 0253-5440
  
Funding Source:
  

The results show that the highest number of leaves, height, girth and survival rate were  achieved in B1, B4, B4 and  B1 blocks, and those of lowest values recorded in B3, B2, B3 and B3 blocks, respectively. Generally two-whorled fully hardened polybag budded stumps are planted in the field in our  country.   But it was revealed from  the experiment that the polyhag grafted rubber seedling is suitable for plant­ ing just after sprouting the shoots. The shoots should not be allowed to grow more than 2.54 cm long in the nursery. This tech­nique saves planting time, expenditure  as well as 'supplying' vacancy filling could be achieved quickly if any casually arises. This investigation shows that this new plant­ing technique  may be recommended  for commercial cultivation of rubber in Bangladesh.

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