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Morpho-physiological Characters and Shoot Reserve Remobilization of Rice Under Different Planting Dates

Naznin Ahmed
Department of Agricultural Botany, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Kamal Uddin Ahamed
Department of Agricultural Botany, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Nasima Akhter
Department of Agricultural Botany, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Md. Tofail Hosain
Department of Agricultural Botany, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Rezowana Nizam
Department of Agricultural Botany, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Md. Saidur Rahman
Department of Agricultural Botany, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

The actual planting date gives the best morpho-physiological characters and highest shoot reserve translocation which finally increased the rice yield. The experiment comprised of two factors-factor a: Planting time (2): T1: 24 January planting; T2: 23 February planting and factor b: Rice variety (5): V1: BRRI dhan29; V2: BRRI hybrid 2; V3: Hera 2; V4: Tia and V5: Taj 1. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Among the different planting time and varieties, 24 January planting and Hera 2 were found superior in terms of morpho-physiological characters and shoot reserve remobilization of rice cultivars. Irrespective of planting times, the highest plant height (112.03 cm), tillers hill-1(16.43), SPAD value of leaves (35.82), and leaf area index (5.74) were achieved. Hera 2 provided the highest shoot reserve translocation (17.83% and 15.84%) at 24 January planting and 23 February planting, respectively compared to other rice varieties. Finally, 24 January transplanting with Hera 2 exhibited the superior combinations than other parameters.

Keywords: Rice, Planting date, Shoot reserve remobilization

Location: Research Farm of Sher-e-Bangla Agricultural University (SAU), Dhaka

Start Date: 00-11-2017

End Date: 00-07-2018

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To evaluate the morpho-physiological characteristics and shoot reserve remobilization of the some selected rice varieties at two different transplanting dates in Boro season.

Methodology:

Experimental site The experiment was conducted at the Research Farm of Sher-e-Bangla Agricultural University (SAU), Dhaka during the periods of November 2017 to July 2018. The climate of the experimental site is sub-tropical, wet and humid. Heavy rainfall occurs in the monsoon (mid-April to mid-August) and scanty during rest of the year. The soil of the experimental area was silt clay in texture. Soil pH was 6.7 and has organic carbon 0.45% (SRDI 2012). Experimental treatment and design Different rice varieties were used as the test crop in this experiment. The experiment comprise of two factors. Factor A: planting time (2): T1: 24 January planting; T2: 23 February planting and Factor B: Rice variety (5): V1: BRRI dhan29; V2: BRRI hybrid 2; V3: Hera 2; V4: Tia and V5: Taj 1. The experiment was laid out in a randomized complete block design (RCBD) with three replications. There were 10 plots of 5m² in size in each of 3 replications resulting 30 plots in total. The distance maintained between two blocks and two plots were 1.0m and 0.5m, respectively. Crop husbandry The seeds were sown in the seedbed @ 70gm^-2 in order to have healthy seedlings. The fertilizers N, P, K, S, Zn and B in the form of urea, TSP, MoP, Gypsum, zinc sulphate and borax, respectively were applied @ 80kg, 60kg, 90kg, 12kg, 2.0kg and 10kg (BRRI 2013). The entire amount of TSP, MoP, gypsum, zinc sulphate andborax were applied during the final preparation of experimental plot. Urea was applied in two equal installments as top dressing at tillering and panicle initiation stages. Two seedlings (21 days) were transplanted in each hill with a plant to plant distance 15 cm and row to row distance 20 cm. Intercultural operations were done to ensure normal growth of the crop. Plant protection measures were followed as and when necessary. Data collection Ten pre-selected hills per plot from which different data were collected. Data on the following parameters were recorded during the course of the experiment such as -plant height, number of tillers hill^-1, SPAD value of leaf, leaf area index, days to booting (DAT), days to panicle insertion (DAT), days to anthesis (DAT), days to maturity (DAT), shoot dry matter at pre-anthesis (gm^-2), shoot dry matter at maturity (gm^-2), changes in shoot dry matter (gm^-2) and shoot reserve translocation (%).Plants from 1m² were sampled from each plot at pre-anthesis and maturity. The harvested plants were separated into leaf blades (leaf), culm and sheath (stem) and panicles. Dry matter of each component was determined after drying at 72⁰C for 72 hours. The shoot reserve translocation was calculated by a net loss in dry weight of vegetative organs between pre-anthesis and maturity using the following formula: Shoot reserve translocation (%) = A-M/M x 100 Where, A = Total shoot dry matter at pre-anthesis (gm^-2) M = Total shoot dry matter at maturity (gm^-2)

Source of Information: J. Biosci. Agric. Res. 19(02): 1613-1627

Article Link (Online Journal): https://doi.org/10.18801/jbar.190219.196

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded that among the five rice varieties, Hera 2 demonstrated the best performance on morpho-physiological characters and shoot reserve remobilization at different transplanting dates. The 24 January planting of seedling increased the plant height, tillers hill^-1, SPAD value of leaves, leaf area index and shoot reserve translocation were 5.78%, 7.39%, 10.48%, 4.76% and 17.66% respectively over the 23 February planting because delayed transplanted rice seedlings had always lower morpho-physiological characters than right time transplanted rice and took shorter days to flower and mature than early transplanted rice which might be due to improper root growth and development causing less absorption of nutrients from soil and shorter duration of temperature and photoperiod during grain filling period. So this might be the possible reason to have high shoot reserve remobilization in right time transplanting of seedling. Finally, 24 January transplanting with Hera 2 exhibited the superior combinations than most the parameters studied. However, further study is required regarding the other rice varieties with different management practices in different Agro-Ecological Zones (AEZ) of Bangladesh for testing the regional compliance and other quality attributes.

Knowledge Management: Journal