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Fifteen wheat genotypes namely Agrani, Prodip, Bijoy, CB 69, Sourav, Sufi, BAW 1064, Gourab, Kanchan Shatabdi, CB 30, Sonora, CB 24, CB34, and Protiva were sown under optimum (Nov. 30) and late (Dec. 30) sowing times to evaluate their performances at high temperature depending on cell membrane thermostability and some morpho-physiological characters. Based on cell membrane thermostability test four genotypes showed the longest heat killing time and were separated as heat tolerant (HT). Four genotypes showed the shortest heat killing time and were separated as heat sensitive (HS). The remaining seven genotypes required time in between those two were separated as intermediate heat tolerant (IHT) genotypes. Lower contribution of photosynthate stem reserves (PSR) to grain in HT genotypes finally contributed to its less affected 1000-grain weight as well as yield. These results suggest that greater cell membrane thermostability supported the minimal changes in some physiological characters of HT ganotypes which ultimately increased the wheat yield under short winter warmer condition.

Fifteen wheat genotypes namely Agrani, Prodip, Bijoy, CB 69, Sourav, Sufi, BAW 1064, Gourab, Kanchan Shatabdi, CB 30, Sonora, CB 24, CB34, and Protiva were sown under optimum (Nov. 30) and late (Dec. 30) sowing times to evaluate their performances at high temperature depending on cell membrane thermostability and some morpho-physiological characters. Based on cell membrane thermostability test four genotypes showed the longest heat killing time and were separated as heat tolerant (HT). Four genotypes showed the shortest heat killing time and were separated as heat sensitive (HS). The remaining seven genotypes required time in between those two were separated as intermediate heat tolerant (IHT) genotypes. Lower contribution of photosynthate stem reserves (PSR) to grain in HT genotypes finally contributed to its less affected 1000-grain weight as well as yield. These results suggest that greater cell membrane thermostability supported the minimal changes in some physiological characters of HT ganotypes which ultimately increased the wheat yield under short winter warmer condition.

Of the total 240 Pangasius hypothalamus (5 - 8.7cm) fry examined during September' O1 to February'02, 80 (33.33%) were found to be infested with one or more ecroparasites irrespective of genera or groups. Seven parasitic groups were identified with the highest average prevalence of Trichodinids (55%) followed by Dacrylogyrus spp. ( 42%), Episrylis spp. (8%), Apiosoma spp. (7%) Argulus spp. (5%), Gyrodacrylus spp. (4%) and Piscicola spp. (2%) the lowest prevalent group irrespective of months. Trichodinid and Dacrylogyms spp. were recorded to be the dominating parasitic groups among the seven both in terms of monthly prevalence and severity of infestation throughout the period of investigation. The highest prevalence (60%) of ectoparasite was recorded in December and the lowest (10%) in February irrespective of groups.

This study examines the relative profitability of rice-fish culture and rice mono-crop production at Gouripur thana of Mymensingh district. The results of the study show that the rice-fish farming was economically more rewarding than the rice mono-crop farming, although both the farming activities were found profitable over cash as well as full costs. In addition to extra earnings from fish, the rice-fish farming produced significantly a higher yield of rice requiring very minimum extra cost for fish. Rice-fish farming also reduced variability in yield of and return from rice.