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Pre-planting Hardening-induced Variability in Yield Attributes and Yield of Inbreed and Hybrid Rice

Sadia Masrufa
Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Anisur Rahman
Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Md. Hasanuzzaman,
Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Taufika Islam Anee
Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Md. Hazrat Ali
Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Mirza Hasanuzzaman*
Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

Short term hardening before transplanting may enhance the defense mechanism of rice seedlings against any stress during their establishment and contribute to enhanced growth and yield. Thus, this study was conducted involving one local inbred (Pajam), one popular high yielding (BRRI dhan53) and one hybrid (BRRI hybrid dhan4) rice variety. The experiment was laid out in randomized complete block design with two factors. Seedlings were transplanted directly to the main field as a control treatment and/or subjected to four different hardenings like seedlings storage in shade, open field under sunlight, float in water and cold air in refrigerator before transplantation. Hybrid variety out yielded both the local and inbred varieties due to their highest effective tillers, longer panicle length and 1000-grain weight. Pre-hardening of seedlings in open field under sunlight conditions enhanced the yield attributes and ultimate yield of rice compare to others. The best combination was pre-hardening seedlings in open field conditions with hybrid cultivar regarding to the yield attributes and final yields. It is suggested that hybrid variety and pre- hardening of seedlings before transplantation to the main field could be increase the rice yield productions.

Keywords: Seedling hardening, Hybrid rice, Seedling storage, Transplanted rice

Location: Agronomy field of Sher-e-Bangla Agricultural University

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To investigate the effect of seedling hardening on the performance of Aman rice as well as to compare the relative performance of local, high yielding variety (HYV) and hybrid rice under different hardening treatment.

Methodology:

The field experiment was conducted at the Agronomy field of Sher-e-Bangla Agricultural University under the agro-ecological zone of Modhupur Tract, AEZ-28. Geographically the experimental are is located at 23°77¢N latitude and 90°33¢E longitude at an altitude of 8.6 meter above sea level. The farm belongs to the Shallow Red Brown Terrace Soils. The soils were clay loam in texture with pH 5.4 to 5.6 and 0.82% organic carbon. Seeds of three rice genotypes (Oriza sativa L. cv. BRRI dhan53, BRRI hybriddhan4, and Pajam) were obtained from Bangladesh Rice Research Institute, Gazipur, Bangladesh. Seedlings were grown at raised seedbed for 25 days. Seedlings were uprooted the seedbed and tied in bundle and kept in different place for pre-hardening according to the treatments before transplanting to the main field. Seedlings were pre-hardened by the following treatments viz. T₁ = Direct transplanting (control), T₂ = Storage in shade (seedlings kept in shade for 48 h), T₃ =Storage in open field (seedlings placed at normal condition under sunlight for 48 h), T₄ = Storage in water (seedlings float in water for 48 h) and T₅ =Storage in cool air (seedlings kept in cold temperature at 4°C in refrigerator for 24 h). The experiment was laid out in randomized complete block design (RCBD) including two factors with three replications. A basal dose of fertilizer with P₂O₅, K₂O, Z and S was supplied in the form of triple super phosphate, murate of potash, zinc sulphate and gypsum. Urea was top-dressed in three equal installments at land preparation, 30, and 50 days after transplanting. Two seedlings were transplanted in each hill maintain 25 × 15 cm on the well puddle experimental plots. Intercultural operations were done whenever necessary.

The yield contributing characters such as number of effective and non-effective tillers hill^-1, number of grains panicle^-1, panicle length and 1000-grain weight were recorded from plant samples. Three square meters at center of each plot was harvested, dried, threshed and adjusted 12% moisture content to estimate the grain yield. Harvest index was calculated by the following equation-

Harvest index (%) = (Grain yield/Biological yield) × 100.

The recorded data were subjected to statistical analysis. Analysis of variance was done following two factor split plot design with the help of computer package XLSTAT 2014 and mean separation done by LSD at 5% level of significance.

Source of Information: Bangladesh Agron. J. 2016, 19(1): 87-97

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In summary, hybrid variety BRRI hybriddhan4 over-yielded the modern and local inbred varieties (BRRI dhan53 and Pajam) due to higher yield attributing characters. Pre-hardening seedlings under open air for 48 h triggered the ultimate yield advantage over direct transplanting after uprooting from the seedbed.

Knowledge Management: Journal