Impacts of nitrogen and potassium management on yield of transplant aman rice

ABSTRACT

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during July to November, 2019 with a view to finding out the effect of variety and nitrogen and potassium management on yield and yield attributes of transplant aman rice. The experiment comprised of two rice varieties viz. BRRI dhan34 and BRRI dhan49 and six levels of nitrogen and potassium  management viz. F1-Recommended rate of fertilizer (Control), F2-Recommended rate + 25% additional Nitrogen at 7 days after panicle initiation (DAPI), F3-Recommended rate + 25% additional potassium at 7 DAPI, F4-Recommended rate + 25% additional Nitrogen + 25% additional potassium at 7 DAPI, F5-Recommended rate + foliar spray of 2% urea & 1% MoP at 7 DAPI and F6-Recommended rate + foliar spray of 2% urea &1% MoP at 7 and 14 DAPI. The results of the experiment revealed that the main effect for varieties and nitrogen and potassium management were significant for grain yield but not significant due to the interaction between variety and nitrogen and potassium management.  BRRI dhan49 gave the higher yield (7.13 t ha-1) than BRRI dhan34 (5.38 t ha-1). In respect to nitrogen and potassium management, the highest grain yield (7.34 t ha-1) was obtained with recommended rate + 25% additional nitrogen+25% additional potassium at 7 DAPI which was statistically similar with other treatments  and the lowest (5.42 t ha-1) was found with recommended rate of fertilizer. Therefore, it may be concluded that the maximum yield of rice variety BRRI dhan34 and BRRI dhan49 could be obtained by applying additional 25% nitrogen and 25% potassium at 7 DAPI in addition to the recommended rates of fertilizers.

Key words: Nitrogen, potassium, yield, transplant aman rice.

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

ABSTRACT

The experiment was conducted with tossa jute (Corchorus olitorius L.) at Jute Agricultural Experimental Station, Jagir, Manikgonj during 2017. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Significant variations were observed for different agro-morphological characters among the genotypes. Phenotypic coefficient of variation (PCV) was higher than corresponding genotypic coefficient of variation (GCV). The highest PCV was observed for the character green wt. with leaves (22.94). Heritability was highest for green bark thickness (98%) followed by green wt. without leaves (93%), base diameter (81%) and leaf length (79%). The highest genetic advance as percentage of mean (44.38%) was estimated against green weight without leaves, followed by (41.62%) was estimated against green bark thickness, (21.50%) was estimated against base diameter.

Key words: Genetic variability, heritability, genetic advance, tossa jute.

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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.

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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.

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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

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Efficacy of different fungicides for managing botrytis grey mould of chickpea

ABSTRACT

Efficacies of different fungicides were evaluated in managing botrytis grey mould of chickpea. This field experiment was conducted in two sub-station of Bangladesh Institute of Nuclear Agriculture (BINA): Magura and Ishwardi. Fungicides increased seed germination over control in field condition both in Magura and Ishwardi. Seed germination percentage in Magura and Ishwardi was higher in Bavistin treated plots 95.25% and 93.87% respectively. Fungicides treated plots showed lower disease incidence over control. In Magura incidence of botrytis grey mould of Binachola-3 was recorded highest in control plots (5.91%) and lowest in Bavistin (2.04%). In Ishwardi lowest incidence was recorded at Bavistin (3.15%) and highest was recorded in control plots (6.54%).  Disease incidence reduction over control for Magura and Ishwardi were 65.48% and 51.77% respectively. Plant height, plant stand, number of pod per plant, number of seed per pod, unfilled pod per plant, seed weight per plant and dry plant weight was observed higher in treated plots over the control plots both in Magura and Ishwardi. Bavistin treated plots resulted the lowest botrytis grey mould incidence with higher yield components than the non-treated plots. Others treatments such as Secure, Biofungicides, Ridomil gold, Rovral, nativo, Dithane M-45 also showed significantly the better results (in reducing) for management of botrytis grey mould of chickpea than the control plots in the fields.

Key words: Fungicides, efficacy, botrytis grey mould and chickpea

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