The field experiment was conducted during the rabi season of 2005-06 in the farmer's field of Multi-location Testing (MLT) site, Melandah, Jamalpur to evaluate the performance of sweet potato varieties as well as to determine the optimum dose of fertilizer of sweet potato. Two varieties of sweet potato viz., i) BARI Sweet Potato-5 and ii) BARI Sweet Potato-7 and five fertilizer doses viz., i) Estimated fertilizer dose for average yield goal (EDI for average yield goal), ii) Integrated Plant Nutrient System (IPNS) basis fertilizer dose, iii) Fertilizer Recommendation Guide' 97, iv) Farmer's practice, and v) Control. The highest sweet potato yield was obtained from BARI SP-7 with (IPNS) basis fertilizer doses (33.9 t/ha). The lowest sweet potato yield was obtained from BARI SP-7 with control treatment. The highest gross return (112700 Tk./ha) and gross margin (10756 Tk./ha) was recorded from IPNS basis fertilizer treatment. The lowest gross return (40950 Tk./ha) and gross margin (40951) Tk./ha) was recorded from control treatment. But the cost and return analysis showed that the highest benefit cost ratio (24.95) and marginal rate of return (1452) was found from FRG/97 treatment due to lower additional cost.
The experiment was carried out in the Old Brahmaputra Floodplain soil at the farmer's field of Farming System Research and Development (FSRD) site, Kushumhati, Sherpur under Sherpur district in the medium high land under AEZ-9 for the three consecutive years 2003-06 to determine economic combined dose of organic and inorganic fertilizers for Potato-Boro-T.aman cropping pattern. Six treatment management packages including one farmer's practices, and one fertilizer control were tested. The other four treatments were soil test based (STB) fertilizer dose for moderate and high yield goals (MYG and HYG), STB based fertilizer dose for HYG plus 5 t/ha cowdung (IPNS) and fertilizer dose for Fertilizer Recommendation Guide'97 (FRG '97). Average of three years' results showed that recommended fertilizer dose based on the FRG '97 was more economic than all other fertilizer doses for the whole pattern. But the treatment Integrated Plant Nutrition Systems based on fertilizer management with cowdung for high yield goal produced the maximum grain and straw yields in the first crop. Application of cowdung had no significant effect on the yield of succeeding crops. The variable cost was higher for the treatment consisting of cowdung due to additional cost of cowdung. The highest marginal rate of return 1626% was obtained from recommended fertilizer based on the FRG '97.
Sixteen white open pollinated populations of maize were evaluated in 1995 and 1996 season at Sids Agric. Res. Station of the ARC, Egypt under 5 soil moisture regimes (4 stressed and one non-stressed environments). The objectives were to: 1-identify maize traits strongly associated with yield under water stress to be used as selection criteria for reliable screening drought tolerant genotypes; 2-to estimate the heritability under different soil moisture regimes and 3-to compare these moisture regimes as evaluation environments based on expected genetic advance from direct and indirect selection.Results suggested that the strogest association with absolute yield under drought stress environments was negative for days to 50% silking, anthesis to silking interval (ASI), leaf/air temperature and barren stalks (%). Moreover, such association was positive for ears/plant and kernels/row. Thus, these triats were considered as useful selection criteria for screening maize genotypes for their drought tolerance if phenotypic correlation reflects positive relationships at the genetic level.Heritability estimates under drought stress environments for grain yield, number of kernels/row, leaf/air temperature and leaf rolling were lower but those for ASI, ears/plant and stay green traits were higher than those estimates under non-stressed environment.The prediction gain from direct selection in either stress or non-stress environments was greater than that from indirect selection in either stress or non-stress environments for all studied traits (ASI, leaf rolling, leaf temperature, stay green, ears/plant and grain yield). Maximum genetic advance from direct selection for grain yield was obtained from the stressed environments at flowering stage.
Bemisia tabaci (Genn.) is considered the main factor of yellow leaf curl virus for cucumbers and other crops such as tomato, pepper, aubergine, okra, soybean, cotton and ornamental plants. Field trials were conducted in Fayoum Governorate, district of Fayoum on four cucumber varieties in four transplantations dates; 1 / 3, 1 / 4, 1 / 9 and 1 / 10 / 2011 to study the efficiency of the bioinsecticides, Mycotal (Verticillium lecanii), Biosect (Beauveria bassiana) and their mixture as well as Capel 2 E.C against the second instar nymphs of the whitefly B. tabaci. Tested cucumber varieties were Medina, Amera, Dama and Maram.In that concern, Dama variety proved to be less sensitive and the mean of reduction was (79.8%) and Amera was more sensitive showing reduction rate of (94.7%) in 1 / 3 / 2011.
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