Influences of different plant spacing and application times of growth regulator (mepiquat chloride) on the internode length of cotton-

ABSTRACT

An experiment was conducted at Cotton Seed Multiplication, Training and Research Farm, Sreepur, Bangladesh during 2016-2018 to evaluate the response of cotton plant height to different plant spacing, concentration as well as time of application of mepiquat chloride (MC) as growth regulator. Plant spacing were  like 45 cm × 30 cm, 60 cm × 20 cm, 60 cm × 30 cm, 60 cm × 40 cm, 75 cm × 30 cm, 75 cm × 40 cm, 90 cm × 10 cm and 90 cm × 45 cm; MC was sprayed @ 1.0 ml L-1 water at 25, 50, 75, 100 and 125 days after emergence (DAE) in 2016 whereas  @ 1.0, 2.0, 3.0 and 4.0 ml  L-1  water at 25, 50 and 75 DAE for each conc. in 2017. During 2008 MC sprayed @ 2.0 and 4.0 ml L-1 water at 25 DAE, 2.0 and 4.0 ml L-1 water  at 50 DAE,  2.0 ml L-1 water  at 25 as well as 50 DAE in 2018 along with water sprayed  as control. The shortest internodes (3.00 cm) was obtained from 1ml MC L-1 water at 25 DAE with medium plant spacing 60 cm ×   30 cm and the longest (6.67) was from water treatment with 90 cm × 45 cm spacing. So, cotton cultivation in Sreepur, Gazipur areas may be accelerated with foliar application of mepiquat chloride @ 1 ml L-1 water at 25 DAE along with plant spacing of 60 cm x 30 cm for higher yield and quality.

Key words: MC, spacings, foliar application, internode length

PDF DOWNLOAD

Genetic diversity analysis for different agro-morphological characters of tossa jute

ABSTRACT

The genetic diversity was studied for eleven growth and yield related characters in fifty three genotypes of tossa jute which were collected from the Gene Bank of Bangladesh Jute Research Institute (BJRI), Dhaka. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. The highest intra-cluster distance was estimated for cluster IV (0.338) which consisted of fourteen genotypes followed by cluster III (0.330) for eighteen genotypes, cluster V (0.297for seven genotypes and cluster II (0.284) for eleven genotypes. Cluster III contained the largest number of genotypes (eighteen) followed by cluster IV (fourteen) and cluster II (eleven), respectively. The inter cluster distance was maximum between cluster I and V (20.616) followed by the distance between clusters I and IV (18.405), I and III (14.857), II and V (10.984), I and II (10.277) indicating that the genotypes grouped within these cluster were highly divergent from each other. The least genetic distance at inter-cluster level was observed between cluster IV and V (2.871), followed by the distance between clusters III and IV (4.296), and between II and III (4.584) indicating that the genotypes of these clusters were genetically closely related. The maximum contribution was paid by the character, base diameter (0.5335) followed by green wt. without leaves (0.4790), green bark thickness (0.4672) and plant height (0.3858).

Key words: Genetic diversity, clustering, tossa jute.

Introduction

 Information on genetic divergence among the parental materials is vital to plant breeder for an efficient choice of parents for hybridization. More diverse parents are the chances for high heterotic F1S and broad spectrum of variability in segregating generation (Murty and Arunachalam, 1966). However, evaluation of genetic diversity is important to know the source of gene for a particular trait within the available germplasm (Tomooka, 1991). In the past, very few researches have been carried out related to morpho–agronomic diversity and relationships in jute with diverse geographical origins. Plave and Sinha (2005) used 6 accessions of C. capsularis L. and 7 accessions of C. olitorius L. for their study. Recently, Benor et al. (2012) used only C. olitorius L. species to study genetic diversity and relationships inferred from molecular and morphological data. Moreover, multivariate methods particularly principal component analysis (PCA) have proven to be useful for characterizing, evaluating and classifying germplasm when a large number of accessions are assessed for several characteristics of agronomic importance (Badenes et al., 2000). Rapid genetic improvement of crop depends on the availability of sufficient genetic diversity, which could be selected and combined in various forms to produce reasonable improvement (Wani, 2011). Hence in the present study the genetic diversity was studied for eleven growth and yield related characters in fifty three genotypes for further development and creation of higher diversity in tossa jute.

PDF DOWNLOAD

Comparative returns among farmers’ alternate cropping patterns in comparison with existing farmers’ practices in Jashore region of Bangladesh

ABSTRACT

The experiment was conducted at the Jute Research Sub-station, BJRI in Jashore during the cropping season in 2020 to improve an economically sustainable and profitable cropping pattern over the existing pattern. Four alternate cropping patterns viz. Boro-jute-T. aman (ACP1); Boro-T. jute-T. aman (ACP2); Boro/jute-   T. aman (ACP3) and Boro-jute/B. aman (ACP4) were introduced against the existing farmers’ cropping pattern Boro-fallow-T. aman (FCP). The experiment was conducted with three replications following RCB design. The highest rice equivalent yield (19.71 tha-1) was recorded from the cropping pattern Boro/jute-      T. aman (ACP3) followed by ACP2 (19.36 tha-1), ACP1 (19.33 tha-1) and ACP4 (18.86 tha-1). The farmers-managed cropping pattern Boro-fallow-T. aman yielded the lowest rice equivalent yield (12.41 tha-1). The gross return and gross margin in the alternate cropping patterns were higher than those in the existing cropping pattern. In comparison to the farmers’ pattern as cash cost basis, the gross margin was boosted by 55–60% in the farmers’ alternate pattern. The marginal benefit cost ratio was found to range from 2.16 to 2.77. Therefore, for improved crop productivity and profitability, farmers in the Jashore region could adopt alternate cropping pattern on their medium-high land where the lands may fallow after boro harvesting.

Key words: Farmers’ alternate cropping pattern, MBCR, rice equivalent yield, relay, T. jute.

PDF DOWNLOAD

Split application of potassium and its effect on BRRI dhan29 production

ABSTRACT

A field study was carried out to evaluate the growth and yield of BRRI dhan29 as influenced by different potassium level with recommended NPSZn fertilizer under the regional condition of Mymensingh during the period from February to May 2008. The changes in postharvest soil were also evaluated under the present study. The experiment was laid out in a Randomized Complete Block Design with three replications. The experiment consists of five treatments viz. T1: control, T2: NPSZn + K60, T3: NPSZn + K30(FLP) + K30(SA), T4: NPSZn + K90(FLP), T5: NPSZn + K45 (FLP) + K45(SA). Basal application was given with N, P, S, and Zn at the rate of 40, 7, 5, 0.5 Kg ha–1 as urea, triple superphosphate, gypsum and zinc oxide, respectively. The split application of K had a significant positive effect on plant height, tillers hill–1, effective tiller and unfilled grains panicle–1. The grain and straw yields were highly and positively influenced by split application of potassium. The highest grain yield (6.87 t ha–1) and straw (5.89 t ha–1) yields were recorded in T5 containing NPSZn + K45(FLP) + K45(SA). The uptake of K also increased gradually with K rates and the split application also showed better performance than single application. The concentration of K in soil solution depended on treatment and time of sampling. Split application of K showed lower solution K then single application.

 Key words: BRRI dhan29, split application, growth and yield

PDF DOWNLOAD

Developing sustainable renewable solar energy potential in coastal and offshore ships of bangladesh: a way of reducing carbon dioxide emissions and disaster risk reduction

ABSTRACT

There are about 243 marine tanker vessels operate in Bangladesh, and they might serve as an effective location for solar photovoltaic (PV) plants, where solar energy would be the most suited renewable energy to replace the fossil fuel used in the ships. Such PV on maritime vessels does not need land mass, as landmass is a scarce resource in Bangladesh, and is thought to boost efficiency. The quantified vessel navigates between Bangladesh-India, Bangladesh-Malyasia, Bangladesh-Singapore, Bangladesh-Indonesia, Bangladesh-Mumbai, Bangladesh-Sri Lanka. In this paper, a novel approach to the PV array on marine vessel is presented and realistic calculation of energy output is carried out of the planned PV system. Finally calculated the realistic CO2 emission reduction by using this approach for a sustainable future. Applying “globalsolaratlas” software (for horizon and sun’s path estimation); HOMER Pro, PVsyst 7.2, and NREL’s PVWatt calculator (for solar radiation calculation); shiptraffic (for vessels path analysis), vesselfinder (for number of vessels analysis); this research suggests that marine vessels are one of the best places to construct a proposed “tree-shaped solar PV tower” power plant. Estimation reveals that about 35.64 GW of electricity can be generated annually by 181 tanker vessels and will save approximately 9,357.21 tons of CO2 gas emissions annually to the environment when fossil fuel-based power plant for electricity is used.

Key words: Solar Energy; marine Vessels; tree-shaped solar PV tower; coastal and offshore area

PDF DOWNLOAD

Effect of capsicum varieties and mulching on major arthropod pests

ABSTRACT

An experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from October, 2019 to February, 2020 to analyse the effect of different mulching materials and varieties against major insect pest and growth performance of capsicum (capsicum annum L). The experiment was laid out in Randomized Complete Block Design (2 factor) replicated with three times. For this study, factor A-M0= No Mulching; M1= Black polythene Mulching; M2= Paddy straw; M3= White polythene Mulching and factor B- V1= California wonder; V2= Omax hybrid; V3= BARI Misti Morich-1; V4= BARI Misti Morich-2. Results revealed that effect of different mulching materials and varieties against major insect pest and growth performance of capsicum that significantly effect on most of the yield and yield contributing parameters studied in this experiment. Similarly, most of the traits were also affected significantly due to the combination effect. In case of varietal performance, California wonder (V1) showed the best results in terms of the number of whitefly, number of thrips, number of fruit borer, number of mites, number of aphid, number of leaf, length of leaf, fruit length, fruit breadth, number of fruit, number of infested fruit and total yield. In case of mulching treatments, M1 (Black polythene Mulching) showed outstanding performance for percent reducing the number of insect pests and getting the better growth and higher yield compared to those of other treatments. Again in case of combinations of varieties and different treatments, the number of infestation was reduced in V1M1 and V1M1 showed best results in terms of percentage of infested fruit, fruit infestation at weight basis, fruit length, fruit girth, number of fruit Plant-1 and total yield. There was negative relationship present in number of insect and percentage of fruit infestation in weight basis with the yield of capsicum, i.e. when the number of insect and percentage of fruit infestation in weight basis was increased the yield of capsicum was decreased.

Key words: Capsicum, mulching, arthropod pests

PDF DOWNLOAD