S. Roy
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh
N. Islam
Professor
Bangladesh Agricultural University, Mymensingh-2202, Bangladesh
S. Hoshain
Assistant Professor
Department of Agriculture, Noakhali Science andTechnology University, Noakhali, Bangladesh.
A.K. Hasan
Professor
Bangladesh Agricultural University, Mymensingh-2202, Bangladesh
K. Hossen
Assistant Professor
Department of Agriculture, Noakhali Science andTechnology University, Noakhali, Bangladesh.
Density, Planting bed, Variety, T. Aman, Yield, Rice
Agro-ecological Zone of the Old Brahmaputra Floodplain
Crop-Soil-Water Management
The experimental field was located at 24°75' N latitude and 90°50' E longitude and at an altitude of 18 meter. The experimental area belongs to the non-calcareous dark grey soil under Agro-ecological Zone of the Old Brahmaputra Floodplain (AEZ-9). The land was medium high and well drained with silty-loam texture. The soil of the experimental field was more or less neutral in reaction with pH value 6.82, low in organic matter content (1.19%) and the general fertility level of the soil was low. The experimental area was located under the sub- tropical climate which is specialized by moderately high temperature and heavy rainfall during the kharif season (April-September). The factors and treatments included in the experiment were as follows: Factor A: Bed width (3): 30 cm (S1), 40 cm (S2) and 60 cm (S3), Factor B: Hill Spacing (4): 30 cm (T1), 40 cm (T2), 50 cm (T3) and 60 cm (T4). As the variety is tall (>170 cm) with higher number (>20) of tillers hill-1, wider spacing (≥30 cm) were tried which were higher than the normal standard (25 cm × 15 cm). For the double row spacing, three raised beds of 30 cm, 40 cm and 60 cm width (12 m2) were made in every plot. Seedlings were transplanted in double rows on each bed maintaining distances of 30 cm, 40 cm, 50cm and 60 cm between two hills in above mentioned bed systems. The experiment was laid out in a randomized complete block design with three replications. There were two sets of treatments. Each treatment set was replicated thrice. Each block was divided into 12 unit plots where the treatment combinations were allocated at random. Thus the total numbers of unit plots were 36. The area of each unit plot was 12 m2 (4 m x 3 m). A piece of high land was selected for raising seedlings. The land was prepared thoroughly by tilling once with a power tiller and subsequently ploughing three times with country plough followed by laddering. Immediately after final land preparation, the field layout was made on 29th June, 2015 according to experimental specification. Individual plots were puddled with spade and leveled before transplanting of seedlings on 30th June, 2015 as per experimental treatments. Raised beds and furrows were made manually by spade following the conventional land preparation. According to the treatments 30 cm, 40 cm and 60 cm wide beds were made for double rows and the furrows between beds were 30 cm, 40 cm and 40 cm respectively in successive plots. Both organic and inorganic fertilizers were applied in the experimental plots. Cowdung @ 10 t ha-1 was applied before land preparation. The chemical fertilizers were applied @ 200 kg, 150 kg, 150 kg, 120 kg and 12 kg ha-1 as urea, triple super phosphate (TSP), muriate of potash (MoP), and gypsum and zinc sulphate, respectively. The full doses of TSP, MoP, gypsum and zinc sulphate were applied before transplanting on the top of the beds. Urea was top dressed in three equal splits, at 15, 35 and 55 DATs. Eight day old seedlings were uprooted and transplanted with one seedling hill-1 in the unit plot using 4 different spacing on 1st July 2015 as per experimental specification. Care was taken during the growing period for adequate growth and development of the crop. When 80-90% of the grains became golden yellow, the crop was considered to be matured. Five hills (excluding border hills) were selected randomly from each experimental plot to record necessary data. Individual plots were harvested at maturity on 21 November 2015. The harvested crop of each plot was separately bundled, properly tagged and then brought to the clean threshing floor. The crop was threshed manually. Grains were cleaned, weighed and moisture reading was taken by using a moisture meter. Then grain yield was converted to 14% moisture content. Straw were sun dried properly then weighed. Finally straw and grain yields plot-1 were recorded and converted to t ha-1. Data on the following plant characters and yield were recorded: Plant height, Number of total tillers hill-1, Number of effective tillers hill-1, Number of non-effective tillers hill-1, Panicle length, Number of grains panicle-1, Number of unfilled grains panicle-1, Weight of 1000- grain, Grain yield, Straw yield, Biological yield and Harvest index. The collected data were compiled and tabulated in the proper form and analyzed statistically. Analysis of variance was done following the randomized complete block design (RCBD) with the help of computer package MSTAT and the mean differences among the treatments were adjudged by Duncan's Multiple Range Test (Gomez and Gomez, 1984).
Int. J. Sustain. Crop Prod. 12(3):1-6 (November 2017)
Journal