Browsing by Author "Rahman, G. K. M. M."

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BIO-EFFICACY OF CARBOFURAN 5G AGAINST BRINJAL SHOOT AND FRUIT BORER APPLIED AT DIFFERENT ROW COMBINATIONS
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2013-07) Moniruzzaman, M.; Rahman, G. K. M. M.; K. H. Kabir
An experiment was undertaken to determine the suitable pattern of carbofuran application for brinjal cultivation and minimize the application of carbofuran for maximum protection against brinjal shoot and fruit borer (BSFB). The experiment was conducted at the research field of Soil Science Department, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during the period from September 2008 to March 2009. The experiment was laid out in RCBD with 4 treatments and 3 replications. Considering 6m x Sm plot size for each treatment and 60 cm x 7S cm plant spacing with 40 days old brinjal seedlings. The lowest percent of shoot infestation (1.24%) was recorded where carbofuran 30 kg/ha (furataf SG used @ 90g/ 30 m'; T,) was applied in every plant of every row. It was followed by carbofuran IS kg/ha (furatafSG used @4Sg/30m'; T,) was applied in every plant of every alternate row. But there was no significant difference of percent shoot infestation between where carbofuran was applied in every plant of every row and in every plant of every alternate row. However, the highest shoot infestation (3.02%) was recorded where carbofuran 7.50 kg/ha (furataf SG used @ 22.50g1 30 nr'; T4) was applied in every plant of three alternative rows and followed by earbofuran 11.25 kg/ha (furataf SG used @ 37.7Sg/30 m'; T3) was applied in every plant of two alternative rows. Fruit infestation both in terms of number and weight followed the same trend as in shoot infestation and having no significant difference between these two treatments. The highest percent fruit infestation (36.S3%) by number was recorded in where carbofuran was applied in every plant of three alternative rows followed by carbofuran was applied in every plant of two alternative rows. The highest yield (37.67 t/ha) was obtained from where carbofuran was applied in every plant of every row and the second highest yield (37.58 t/ha) was recorded where carbofuran was applied in every plant of every alternate row, although there was no significant difference between these treatments in respect to yield. Significantly, the lowest yield (33.S6 t/ha) was recorded where carbofuran was applied in every plant of three alternative rows in which the maximum distance was maintained in carbofuran application pattern. The highest net return (4,08,SOO Tk/ha) and cost benefit ratio (1.19) was found where earbofuran was applied in every plant of every alternate row. In view of different row combinations, the higher net return and cost benefit ratio may come from where carbofuran application in ring furrow to every plant of one alternate row would be the best option to be utilized in BSFB management programs.
CHANGES OF PHYSICAL AND CHEMICAL PROPERTIES OF POST HARVEST SOIL OF T. AMAN RICE AS INFLUENCED BY ORGANIC AND INORGANIC PHOSPHORUS
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2012-01) Islam, M. S.; Solaiman, A. R. M.; Karim, A. J. M. S.; Rahman, G. K. M. M.; Haque, M. M.
Due to low organic mailer content the agricultural soils of Bangladesh has poor physical and chemical condition. Moreover, the continuous use of phosphorus (P) fertilizers build-up of excessive P in many cultivated soils has created an interest in the combined use of organic and inorganic P fertilizer. Hence, a field experiment was conducted at the Bangabandhu Sheikh Mujibur Rahman Agricultural University Farm, Gazipur, Bangladesh during the Aman season of July 2008 to January 2009 to investigate the effects of combined application of inorganic phosphorus (Pi) and organic phosphorus (1),,)on the changes of physical and chemical properties of soil after T. Aman cultivation. The eight treatments were To, Control/ no fertilizers; T" recommended dose offertilizers; Tz, 50% P through TSP and 50% P through cowdung; T), 75% P through TSP and 25% P through cowdung; T" 50% P through TSP and 50% P through poultry manure; Ts, 75% P through TSP and 25% P through poultry manure; To, 50% P through TSP and 50% P through household wastes; T1, 75% P through TSP and 25% P through household wastes. The experiment was laid out in randomized complete block design (RCBD) and replicated thrice. The physical and chemical properties of the soils were influenced directly by the above mentioned treatments. The physical properties of soil such as particle density and bulk density at different soil depth and plough pan decreased in response to addition of organic matters whereas no significant changes were found in response to inorganic P. The rate of improvement of chemical properties such as organic carbon (OC), cation exchange capacity (CEC), total nitrogen, available Phosphorus (P), exchangeable potassium (K), available sulphur(S), exchangeable calcium (Ca), exchangeable magnesium (Mg) and exchangeable sodium (Na) was higher with inorganic plus organic amendment than to inorganic alone. In addition, soil pH decreased in all treatments. Based on the above results it is suggested that the combined use of inorganic and organic P significantly improve physical and chemical properties of post harvest T. Aman soil.
EFFECT OF ORGANIC AND INORGANIC PHOSPHORUS ON THE YIELD AND NUTRIENT USE EFFICIENCY OF T. AMAN RICE
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2011) Islam, M. S.; Solalman, A. R. M.; Karirrr, A. J. M. S.; Rahman, G. K. M. M.; Haque, M. M.
A field study was conducted to evaluate the effect of combined use of organic and inorganic phosphorus (P) sources on yield contributing characters, yield and nutrient use et1iciency of T. Aman rice. Eight treatments including a control, a recommended doses of inorganic fertilizers and six other treatments which were combinations of inorganic and organic fertilizers where 50 % and 75 % of recommended doses of P were provided by using triple super phosphate (TSP) and the remaining 50 % and 25 % of P were amended by using either cowdung (CD), poultry manure (PM) or household waste (HW). The nutrient P as per treatments and nitrogen (N), potassium (K) and zinc (Zn) as per recommended dose were applied. Combined application of inorganic and organic sources of P significantly increased the yield and yield contributing characters ofT. Aman. The effect of PM was prominent than that of CD and HW. The treatment T. receiving 50 % P through TSP and 50 % P through PM produced the highest grain yield of T. Aman rice (4.34 tlha) and also showed the highest % recovery efficiencies (RE), agronomic et1iciencies (AE) kg/kg, physiological efficiencies(PE) kg/kg and internal efficiencies (IE) kg/kg of nitrogen(N) but failed to increase the physiological efficiencies(PE) kg/kg and internal efficiencies (IE) kg/kg of phosphorus(P).Thus, the present study indicated that the use of both organic and inorganic source of P is an effective way to enhance the yield and increase the nutrient use et1iciency (NUE) for T. Aman rice.