Nilufar Yeismin Nila
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh
Swapan Kumar Paul
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh
Md. Abdur Rahman Sarkar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh
Aromatic Boro rice, Date of transplanting, Growth performance, Morpho-physiological characteristics, Nutrient management
Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh
Crop-Soil-Water Management
Performance
The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, during the period from December 2015 to May 2016. The experimental site is located at 24.75°N latitude and 90.50°E longitude at an elevation of 18 m above the sea level. The site belongs to the non-calcareous dark grey floodplain soil under the Agro-ecological Zone of the Old Brahmaputra Floodplain (AEZ-9) (UNDP and FAO, 1988). The soil of the experimental field was characterized by non-calcareous dark grey floodplain soils with 1.29% organic matter content. The experimental field was a medium high land having pH 6.8. BRRI dhan50 (Banglamoti), a modern fine rice variety, was used as the test variety. The study consisted of five date of transplanting viz. 15 December (D1), 30 December (D2), 15 January (D3), 30 January (D4) and 15 February (D5), and four nutrient managements viz. recommended dose of inorganic fertilizers (N, P, K, S and Zn @ 115, 25, 60, 18, 3.5 kg ha-1, respectively) (F1), poultry manure @ 5 t ha-1 (F2), 25% less than recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha-1 (F3), 50% less than recommended dose of inorganic fertilizers + poultry manure @ 2.5 t ha-1 (F4). The experiment was laid out in a factorial randomized complete block design with three replications. Each of the replication represents a block in the experiment. Each block was divided into 20 unit plots where 20 treatment combinations were allocated at random. There were 60 unit plots in the experiment. The size of unit plot was 4.0 m × 2.5 m. Healthy seeds were used for sprouting. Seeds were immersed in water in bucket for 24 hours and then taken out of water and packed in a moist gunny bags for incubation until sprouting. The seeds started sprouting after 48 hours and then prepared for sown in nursery bed. The seeds were sown in the seedbed on 15 November, 30 November, 15 December, 30 December and 15 January respectively with proper care. Both inorganic and organic fertilizers were applied according to the treatments. The amount of the nitrogen, phosphorus, potassium, sulphur and zinc required for each unit plot was calculated on per hectare basis. Triple super phosphate (TSP), muriate of potash (MoP), Gypsum, zinc sulphate (ZnSO4) and poultry manure were applied at the time of final land preparation as per treatment requirements. Urea was top dressed in three equal splits at 15, 30 and 45 days after transplanting (DAT). The seedbed was made wet by application of water in the morning and evening on the previous day before uprooting. The seedlings were uprooted without causing massive mechanical injury to the roots and were kept in the soft mud in shade. Thirty-day old seedlings were transplanted on 15 December 2015, 30 December 2015, 15 January 2016, 30 January 2016 and 15 February 2016, respectively in the well puddled plot. Transplanting was done by using two seedlings hill-1 with 25 cm × 15 cm spacing between the rows and hills, respectively. Five hills were randomly selected soon after transplanting and marked with bamboo sticks in each plot excluding border rows to record the data on plant height and number of tillers hill-1 at 15-day intervals beginning 15 DAT up to 75 DAT. To record the total dry matter, two plants were randomly selected excluding border rows and central 1 m2 area at 15-day intervals beginning 15 DAT up to 75 DAT. To determine leaf area index leaf samples were collected from one hill from each plot at 65 DAT. Leaf blades were separated and leaf area was measured by using a leaf area meter at the Professor Muhammad Hussain Central Laboratory, Bangladesh Agricultural University, Mymensingh. LAI was calculated by the following standard formula as shown below. LAI = LA/P; Where, LA= Leaf area and P = Ground area. Data were compiled and tabulated in proper form for statistical analysis. The recorded data were statistically analyzed to find out the significance of variation resulting from the experimental treatments. All the collected data were analyzed adjudged by Duncan's Multiple Range Test (DMRT) (Gomez and Gomez, 1984).
Archives of Agriculture and Environmental Science 3(2): 116-122 (2018)
Journal