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Influence of Nitrogen on Growth Performance of Hybrid and Inbred Rice (oryza Sativa L.) Varieties in Boro Season

M. Sh Islam
Agronomy, Bangladesh Rice Research lnstitute, Regional Station, Sagordi, Barisal, Bangladesh

M.S.U. Bhulya
Department of Agronomy, Bangladesh Agricultural University, Mymensingh, Bangladesh

Abstract/ Executive Summary:

Field experiments were conducted during boro season of 2002 and 2003 at the Bangladesh Rice Research Institute (BRRI) farm having silty clay loam soil. Hybrid variety Sonarbangla-I and BRRI hybrid dhan I and modern inbred variety BRRl dhan29 were used in the experiments. Zero to 160 kg N ha^-1 with 40 kg interval and different application schedules, chlorophyll meter based (SPAD 35) application and urea supper granules (USG) @ 80 kg N ha^-1 were used as N treatments. During boro 2002, BRRl hybrid dhan I had 10-15% higher tiller number, leaf area index (LAl) and crop growth rate (CGR) than Sonarbangla-1 and BRRI dhan29. Among the N management, N₉ (USG), N5 (160 kg N ha^-1 with basal), N₆ (160 kg N ha^-1 without basal), and N7 (SPAD based N application with basal) showed 10-15% higher plant height, tiller hill^-1 , LAl and CGR. During boro 2003, Sonarbangla-1 and BRRl hybrid dhan 1 had 10-15% higher plant height, tiller hill^-1, LAl and CGR compared to the BRRl dhan29. Among the N management, N₉ (USG), N₅, N₆_, N₇. N₃ (120 kg N ha^-1 with basal) and N₄ (120 kg N ha^-1 without basal) treated plots performed better in terms of growth. The LAl and CGR were reduced by 20-25 % at 60 DAT during 2003 compared to 2002 due to cold and the growth of BRRl dhan29 was restricted much.

Keywords: Growth, Hybrid, Inbred, Nitrogen

Location: Bangladesh Rice Research Institute, Gazipur

Start Date: 00-06-2002

End Date: 00-06-2003

Program Area: Variety and Species

Commodity: Rice

Objectives:

To compare the growth of selected hybrid and inbred rice varieties under different nitrogen management practices in field condition.

Methodology:

The field experiments were conducted at the experimental farm of the Bangladesh Rice Research Institute (BRRI), Gazipur during June 2002 to June 2003. The soil was a silty clay loam and slightly acidic (pH = 6.0 to 6.4). The percentage of total N and organic matter (OM) were 0.11 and 2.05, respectively. The experiment was conducted in a factorial randomized complete block design (RCBD) with two factors viz: nitrogen management and variety using three replications. The following N- management treatments were imposed in the experiment: No = Control (No) N₁ = 40 kg N ha^-1 in 2 equal splits at early tillering (ET) and panicle initiation (PI) stage N₂ = 80 kg N ha^-1 in 2 equal splits at ET and PI stage N₃ = 120 kg N ha^-1 in 3 equal splits at basal, mid-tillering (MT) and PI stage N₄ = 120 kg N ha^-1 in 3 equal splits at ET, MT and PI stage N₅ = 160 kg N ha^-1 in 4 equal splits at basal, MT, PI and heading stage N₆ = 160 kg N ha^-1 in 4 equal splits at ET, MT, PI and heading stage N₇ = 30 kg N ha^-1 at ≤ 35 Soil Plant Analysis Development (SPAD) value with basal 30 kg N ha^-1 N₈ = 30 kg N ha-1 at ≤ 35 SPAD value (from 20 DAT to heading) without basal N₉ = 80 kg N ha^-1 as USG deep placement [3 granule (0.9 g size) in-between alternate 4 hills] Hybrid Sonarbangla-I, BRRI hybrid dhan 1 and inbred modern variety BRRI dhan31 were used in the experiment. The unit plot size was 4 x 4 m, a buffer of 75 cm and 30 cm were maintained in between the replications and unit plots, respectively. Transplanting was done manually in well- puddled field in 40-day old seedlings. One healthy seedling (for both hybrid and inbred varieties) was transplanted with a spacing of 20 x 20 cm. Gap filling for dead seedlings were done within 10 days after transplanting (DAT). Fertilizers were applied @ 26-41-10-5 kg ha^-1 of P, K, Sand Zn as triple super phosphate, muriate of potash, gypsum and zinc sulphate during final land preparation and were thoroughly incorporated into the soil. Cultural practices like mulching, weeding etc. were done as and when necessary.

Source of Information: The Agriculturists, Vol: 5, (No-1&2), pp: 77-85, Dec 2007

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Among the varieties, hybrids Sonarbangla-1 and BBRI hybrid dhan 1 had better growth compared to the inbred BRRI dhan29. Among the N management practices, USG @ 80 kg ha^-1 and 160 kg N ha^-1 in 4 equal splits showed better growth performance. The USG and SPAD based N management with basal could save 80 and 40 kg N ha^-1, respectively, by showing similar growth performance with 160 kg N ha^-1.

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