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Effect of Spacings on the Yield and Yield Attributes of Transplanted Aman Rice Cultivars in Medium Lowland Ecosystem of Bangladesh

Md.Jashim Uddin
Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Sultan Ahmed
Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Md. Harun-or-Rashid
Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Md. Mahmudul Hasan
Ph.D. Fellow, Department of Plant Nutrition, China Agricultural University, Beijing-100193. P. R. China,

Md. Asaduzzaman
Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh

Abstract/ Executive Summary:

A study was conducted at medium low land of Agronomy Field laboratory, Patuakhali Science and Technology University, Bangladesh during the year 2008. Three spacings (5×15, 15×20 and 15×25 cm²) were tried to determine the yield and yield attributes of five transplanted aman rice cultivars namely Mothamota, Lalmota, Lalchicon, BRRI dhan41and BRRI dhan44. Among the cultivars, BRRI dhan44 produced the highest grain yield (5.03t/ha), number of filled grains per panicle (97.67), number of total grains per panicle (106.11) and harvest index (48.75%). Among the spacings, 15×20 cm² performed better for grain yield (3.66 t/ha), number of productive tillers per hill (5.13), number of total grains per panicle (91.80), number of filled grains per panicle (84.40) and harvest index (45.50%). Interaction effect of variety and spacing showed that variety BRRI dhan44 excelled in grain yield (5.36 t/ha) and harvest index (49.35%) at the spacing of 15×20 cm². So variety BRRI dhan44 at a medium spacing of 15×20 cm² is recommended for higher grain yield in medium lowland ecosystem of Bangladesh.

Keywords: Oryza sativa; Cultivars; Agronomic characters; Spacing; Bangladesh.

Location: Agronomy Field laboratory, Patuakhali Science and Technology University, Bangladesh

Start Date: 00-00-2008

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

The present study was undertaken to find out the appropriate plant spacing of five transplanted (T.) aman rice varieties in medium lowland ecosystem.

Methodology:

Three spacings viz. 15 x 15 cm² (S1), 15x20 cm²(S2) and 15 x 25 cm² (S3) were tried on five T. Aman rice varieties viz. Mothamota (V1), Lalmota(V2), Lalchicon (V3), BRRI dhan41 (V4) and BRRI dhan44 (V5). The layout system was a factorial randomized complete block design with three replications in a plot measuring 4x2.45 cm². Seedlings were raised in a well-prepared seedbed. The seed rate for nursery bed was 30 kg per hectare. The sprouted seeds of varieties were sown uniformly on well-prepared nurseries on 14^th July, 2008. Transplanting of seedlings was done on 27^th August. All agronomic practices were adopted according to the common recommendations for this crop. Data were collected following standard procedure. The grain yield was measured from one square meter area in each plot and was converted into tons per hectare. The sun-dried straw was weighed from the same sample area harvested for grain yield and converted into tons per hectare. The biological yield was calculated using the following formula. Biological yield = Grain yield + straw yield harvest index was calculated on the basis of adjusted grain and straw yield using the formula recommended by Gardner et al.(10).

Harvest index (%) = Grain yield/Biological yield x 100

Analysis of variance for different characters was done using MSTAT-C software. The treatment means were compared using Duncan's multiple range test (DMRT) at a 5 percent level of significance.

Source of Information: J. Agric. Res., 2011, 49(4)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The study concludes that BRRI dhan44 performed better in most of the evaluating traits like grain yield, straw yield and number of productive tillers per hill. However, plants at a medium spacing of 15×20 cm² produced more grain yield, number of total grains per panicle, number of filled grains per panicle and number of productive tillers per hill. Among the combinations of variety and spacing, BRRI dhan44 produced a higher grain yield at a spacing of 15 × 20 cm2. So, BRRI dhan44 with medium spacing can be suggested for the medium lowland of the coastal area of Bangladesh.

Knowledge Management: Journal