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Articles by N. Islam
Total Records ( 6 ) for N. Islam
  S.N. Mozumder , M. Salim , N. Islam , M.I. Nazrul and M.M. Zaman
  Experiment was conducted to study the effect of Bradyrhizobium inoculation at different nitrogen levels viz. 0, 20, 40, 60 and 80 kg N ha-1 on Binamoog-2. Bradyrhizobium inoculation increased dry matter production, nodulation, pod production, seed yield, harvest index and benefit cost ratio. Nitrogen negatively affected on nodulation and harvest index. Increase of nitrogen fertilizer increased seed yield up to 40 kg N ha-1 and straw yield up to 60 kg N ha-1. Highest seed yield (1607 kg ha-1) and benefit cost ratio (2.35) obtained when 40 kg N ha-1 was applied with Bradyrhizobium inoculation.
  K.M. Hasan , M.K. Begum , M.Salim and N. Islam
  The performance of Ronster 25EC, Setoff 20WG and Golteer 5G at different rates as herbicide in comparison to each other in BR-11 variety of aman rice was investigated. Twelve weeds species belonging to seven families were found to grow and infest the experimental crops of which Angta, Panikachu, Matichaisa and Joina were dominant in respect of population density. Ronstar 25EC @ 1.0 l ha-1 was most effective in controlling weeds (64.21%). However, the epicacy of Ronstar25EC at the rate of 2.0 l ha-1 was more or less identical (62.44%) with that of Ronstar 25EC @ 1.0 l ha-1.
  Md. Abdullah Baki , Nadira Akhtar , M.M. Rahman , M.N. Islam , Mosharrof Hossain , N. Islam , M. Khursed Alam , R. Islam , N.A. Khatun and KAMSH Mondal
  Synergistic effect of W. calendulacea plant extract combined with Lamda cyhalothrin were demonstrated against red flour beetle T. castaneum in methanol extract. W. calendulacea plant extract offered synergistic action when used Lamda cyhalothrin. It was noted that plant extract indicates synergistic action from 1:1 to 1:5 ratio and above.
  Ahsanul Haque , A. K. M. Faruquzzam , Hasina Banu , N. Islam , Md. Abdul Alim and Aleya Nasreen
  In a study, dust of deltamethrin @ 2 ppm and 3 ppm (T8), neem oil (T3), pithraj oil (T7), soybean oil (T1), sesame oil (T4) and jute oil @ 15 m/kg grain (T5), applied to kenaf seeds were fully effective up to 3, 3, 3, 2, 2 and 2 months respectively against adults of Z. subfasciatus Boheman. While castor oil less effective. (T1), (T3), (T4), (T5), (T6) and (T7) caused effective reduction in oviposition up to 2 months and (T8) caused effective up to 3 months. The higher doses of plant oils caused more then 70% egg mortality and reduced adult emergence significantly to prevented further infestation but the efficacy of lower doses deteriorated at later stages of sampling. Finally in another trial, each 500 g kenaf seeds of which each 5 % contained separately each of the four stages of Z. subfasciatus and also containing 5 pairs of adults, was treated separately with each of the above 8 treatments (only highest doses of T1 to T8) and was stored in sealed polythene bags. T1, T2, T3, T4, T5, T6 and T7 offered 86.85 , 81.40, 91.36, 84.34, 86.77, 84.70 and 83.69% grain protection respectively as against 87.54% infestation in the control experiment during 4 months of storage. The germination ability of seeds was not affected by any treatment.
  M. Amjad , N. Islam and S. A. Kakakhel
  The biology of turnip aphid apterous (Lipaphis erysimi Kelt.) was studied in controlled conditions on four cultivars of Brassica viz, B. campestris (Toria-A), B. carinata (Peela raya), B. juncea (Bard-1) and B. napus (Wester). Four nymphal instars were observed. The first stadium was the shortest on B. juncea and longest on B. campestris. Stadia for 2nd, 3rd and 4th instar ranged between 17-23, 20-24 and 29-31 hours, respectively. The reproductive time was the shortest on B. campestris and fecundity was at par with other cultivars of Brassica. The pre and post-reproductive times were not significantly different and ranged from 16-22 and 17-22 hours, respectively. The developmental time was approximately six days. The reproduction was significantly high on B. campestris and B. napus leading to higher intrinsic rate of increase on B. campestris than B. juncea and B. carinata.
  S.A. Kakakhel , N. Islam , M. Amjad and M.A. Malik
  The most important species attacking the sunflower crop are whitefly (Bemisia tabaci Gennad.), plant hopper (Empoasca spp), cabbage semilooper (Thysanoplusia orichalcea F.), hairy caterpillar (Diacretia oblique Walk.), green stink bug (Nezara viridula L.), Helicoverpa armigera Hubner and dusky bug (Nysius inconspicuus Distant.). The peak infestation of sucking pests, whitefly and plant hopper was observed in last week of May and first week of June, respectively on spring crop. Their population remained high upto the first week of October on autumn, Among the defoliators, the maximum population of cabbage semilooper was observed during the second week of April and again in the second week of September. The peak population of hairy caterpillar was recorded in the second week of October. However, the later pest did not appear during spring. Among the direct pests, the highest numbers of H. armigera Hubner was recorded in the first week of May. It did not attack during autumn. The highest population of dusk bug was noted in the first week of October as well as in the first week of June. These results, however, confirmed that whitefly is a serious pest on autumn sunflower while high population of plant hoppers during both the seasons caused more damage than that of whitefly. The present study also showed that cabbage semilooper may be a potential sunflower pest. The green stink bug and H. armigera Hubner. have found to be minor pests. The dusky bug might be classified as a serious pest of spring.
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