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Articles by A.K.M. Golam Sarwar
Total Records ( 3 ) for A.K.M. Golam Sarwar
  M. Touhidul Islam , A.K.M. Azad-ud-doula Prodhan , S.M. Abdul Bari and A.K.M. Golam Sarwar
  Anatomical investigation has been made on the hypocotyl of country bean (Lablab purpureus (L.) Sweet) at different stages of growth following the standard paraffin method of microtechnique. The basal part of the hypocotyl is root-like in structure while the middle and upper parts are stem-like. The transition of vascular tissues occurs in the basal part of the hypocotyl. The vascular bundles are collateral in arrangement in the middle and upper parts and radial in the basal part. There are two types of vascular bundles, small and large in the middle and upper parts. There are 1-2 small vascular bundles in between two large bundles. The large vascular bundle contains xylem and phloem but small bundle may or may not contain both xylem and phloem. There are several poles of primary phloem outside the primary xylem. In the basal part of the hypocotyl there are 4 strands of xylem alternating with phloem zones. Each xylem strand is divided into 2 xylem poles which are either connected or separated. There are several poles of phloem in the phloem region in between 2 xylem strands. The vessels in the xylem strands are found to be radially arranged as seen in the basal part of the hypocotyl. Lots of tanniniferous cells with or without content have been found in the primary phloem region. The pericycle is discontinuous. Two adjacent groups of sclerenchyma are connected by one or two layers of sclerenchyma cells. Sometimes 1-2 vascular bundles, either large or small, contain a single band of sclerenchyma on their abaxial sides. The cambium appears and becomes active in the fascicular region earlier than the interfascicular region. The cambium appears in the basal part of the hypocotyl of 4 days old seedling. Gradually it extends towards the upper part. The cambium forms a ring in the basal part of the hypocotyl of 7 days old seedling. The epidermis, cortex and pith resemble a typical dicotyledonous plant. The phellogen appears in the cortex and gives rise to cork and phelloderm. A well developed periderm is formed in the hypocotyl of mature plant.
  M. Touhidul Islam , A.K.M. Azad-ud-doula Prodhan and A.K.M. Golam Sarwar
  Anatomical investigation has been made on the root of country bean (Lablab purpureus (L.) Sweet) at different stages of growth following the standard paraffin method of microtechnique. The root is tetrarch with 4 strands of xylem and 4 strands of phloem. One strand of xylem alternates with one strand of phloem. The four opposite strands of the primary xylem meet at the centre. Ultimately the centre is filled up with big metaxylem vessels. Most of the vessels in the mature root are solitary while the others are paired or multiple. The epidermis is single layered with root hairs and glandular trichomes. The epidermis is ruptured here and there and the epidermal cells are disorganized due to the stress of secondary growth. Soon after the disorganization of the epidermal cells the phellogen appears in the cortex. The cortex resembles a typical dicotyledonous plant excepting the endodermis, which is poorly developed. The cambium appears in the basal part of 4 days old root. In mature root, the fibre cells are arranged in groups. The fibre groups are radially arranged in such a way that the structure seems to be a pyramid. Adaxial to the phloem region, tanniniferous cells have been found. The protophloem sieve tubes are accompanied by hyperchromatic phloem parenchyma without any companion cell. The well-developed periderm has been found in the root of country bean.
  M. Raihanul Islam Chowdhury , A.K.M. Golam Sarwar and A.M. Farooque
  To find out the effect of nitrogen and the proper method of its application for maximizing the yield of potato, four doses of nitrogen, 0, 60, 120 and 180 kg ha-1, supplied as urea (containing 46% N), and five different methods of its application, were used. All top dressing operations were done in two installments of equal quantity at 30 and 50 days after planting (DAP) of potato tuber. All the parameters studied were differed significantly among the doses and methods of urea application. Application of urea @ 180 kg N ha -1 as 50% basal + 50% top dressing produced the highest yield among the doses and methods, and it was found to be the most cost effective (1.99). It might be concluded that 180 kg N ha -1 and split application (50% basal + 50% top dressing in two installment of 30 and 50 DAP) was superior to all other treatments to avoid the detrimental effect of urea on plant emergence, growth and tuber yield in Bangladesh.
 
 
 
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