Present investigation was carried out at Natore Sugar Mills area, Natore, Bangladesh during 2014-15 to evaluate the growth and yield responses of hybrid maize varieties under different levels of nitrogen fertilization. Two hybrid maize varieties viz. BARI hybrid maize-7 and BARI hybrid maize-9 were tested under four nitrogen levels (N0= without external nitrogen supply, N1= 115 kg N ha -1 , N2= 230 kg N ha -1 , and N3= 345 kg N ha -1 ). All recommendations agronomic practices were used for both the , grain number line -1 ,1000-grains weight, grain weight cob -1 ,grain yield, straw yield and biological yield) were measured during and on the completion of the study. BARI hybrid maize-9 achieved maximum yield (10.99 t ha -1 ) and it was followed by the BARI hybrid maize-7 (10.37 t ha -1 ). Results of study revealed that yield traits and final yield significantly increased with increasing nitrogen fertilizer from 0 to 345 kg ha -1. Among various tested N-fertilizer doses, highest grain yield was obtained from the plot treated with N3 treatment (345 kg ha -1 ) but it was not statistically differing from the N2 treatment (230 kg ha -1 ). Therefore, N2 treatment (230 kg ha -1 ) could be recommended for variety BARI hybrid maize-9 as the best economical nitrogen level for maximum economical yield of maize.
Fifteen salt tolerant CIP (International Potato Centre) Potato genotypes along with BARI (Bangladesh Agricultural Research Institute) Alu 7 (Diamant) and one local variety viz., Dohazari Sada were evaluated at Bashkhali, Chittagong during 2011-12 to screen the suitable genotypes for cultivation in saline areas of Bangladesh. Diamant and Dohazari Sada and all of the CIP genotypes were found to grow well up to 60 DAP (Days After Planting) at saline areas having healthy plants and no senescence was noticed but after that 61-100% plants died due to high level of soil salinity (6.41dS/m) depending on genotypes. Genotype CIP 112 gave the highest yield (21.07 t/ha) and CIP 102 was comparatively less affected by soil salinity than the other genotypes. However, all the salt tolerant CIP genotypes were found to be promising in the saline soil.
A model of evaporative cooling storage system was designed to increase potato shelf life for improving potato storage system. Two cultivars of potato 'Diamant' (100 gm and 51 gm per tuber) and 'LalPakri (23 gm and 11 gm per tuber) were placed on four shelves of the bin. Each shelf holds 240 kg of potato from 23 march 2013 to December 2013. Potato spoilage, sprouting, shrinkage, moisture content, vitamin C and total sugar content of potato were measured. Experimental results revealed that potato spoilage progressively increased from April to November and sprouting of potato gradually increased from June to October, but stopped in November. The cumulative spoilage and sprouting were much lower in the improved bin compared to traditional farmer's practices. Shrinkage of potato was found higher in farmer's practice than that of storage bin from October to November. Moisture content of potato was higher during May and reduced gradually to the lowest value during November in both of practices. No significant difference was found in two practices on vitamin-C content. Sugar content of 'Diamant; potato was lower in the storage bin during November. According to data analysis and regression curve storage bin model was more appropriate for both cultivars than farmer practice and significantly more appropriate for 'LalPakri' potato.
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