ABSTRACT

A field study was conducted to assess the interaction effects of irrigation and nitrogen rates on hybrid maize yield. The research was conducted during December 2013 to April 2014 at the farmer field Tabaria area of Natore District in Bangladesh. The experiment consists of (i) two irrigation treatments viz. no irrigation and three irrigation and (ii) two nitrogen levels viz. no nitrogen use and 230 kg Nha^-1.The experiment was laid out in a split plot design with three replications having 12 unit plots with 20 m² sized. The interaction effect of irrigations and nitrogen levels significantly influenced the yield attributes of BARI hybrid maize-7 except cob grain free and harvest index, where the yield and yield attributes increased with increasing irrigation and nitrogen levels in all cases.

Key words: Nitrogen, irrigation, yield, maize.

ABSTRACT

This study has been conducted in January 2019 to assess the heavy metal contamination in soils of road site from Mymensingh to Valuka focusing the vehicles emission run on highway. Sixteen (16) soil samples were collected consisting of road side traffic area soil and adjacent to road side near agricultural field soil (within) 100m. The samples were digested with acid mixture (HNO₃:HClO₄=2:1) and then the concentrations of four heavy metals Zn, Pb, Cr, and Cd were determined using Atomic Absorption Spectrophotometer (AAS). For assessing the contamination levels of heavy metals, contamination factors (CF), degree of contamination (Cd), index of geo-accumulation (Igeo) were measured comparing with the international standard. Elevated metal concentrations were found in road site soil samples. The geo-accumulation index (Igeo) indicated that the road was moderately polluted by Zn, moderately to strongly pollute by Pb, whereas field soils were free from Zn and Pb contamination. Cr and Cd were unpolluted in both types of soils. The values of contamination factor (CF) existed as Pb> Zn > Cd > Cr for the road side soil. The values of contamination factor (CF) existed for agricultural field soil ranked as Zn >Pb> Cd >Cr. The degree of contamination of all sampling sites show very moderate to low degree of contamination. Pollution load index calculated from the CFs indicated that Zn and Pb are the major pollutants in the studied road side soils along Mymensingh to Valuka highway.

Key words: Heavy metals, contamination, highway soil.

ABSTRACT

A pot experiment was carried out at the pot yard of Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh during kharif-1 season to evaluate the performance of five summer tomato genotypes (CLN 2418, CLN 2443, CLN 2366, CLN 2413 and J-5) on the basis of some important morphological and yield components. The experiment was conducted in Completely Randomized Design with three replications. The collected data were analyzed statistically and means were adjudged by DMRT at 5% level of probability. Results revealed that there were significant genotypic differences in respect of all parameters studied. It was further revealed that in general, high yielding genotypes showed superior performance in respect of yield contributing characters compared to low yielding ones. The genotypes, CLN 2418 and CLN 2443 produced higher fruit yield (1.49-1.54 kg plant^-1) with the highest being in CLN 2418 (1.54 kg plant^-1) due to its superiority in respect of all yield contributing characters. In contrast, CLN 2366 produced the lowest fruit yield (1.25 kg plant^-1) due to poor performance in yield contributing characters. Further, harvesting duration was the highest in CLN 2418 (36 days) and the lowest was in CLN 2443         (30 days). But the keeping duration was the highest in CLN 2443 (9 days). CLN 2418 also showed 7 days shelf life when stored in room temperatures without deteriorating the quality in summer season.

Key words: Tomato, mutant, yield, keeping quality