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Response of Boro Rice (brri Dhan29) Under Different Irrigation Practices

S.K. Jha
Bangladesh Agricultural University.

M.K. Hossain
Agricultural Engineer, Department of Agricultural Extension. Khamerbari, Farmgate, Dhaka-12I5. Bangladesh

M.S.U. Talukder
Professor
Department of Irrigation and Water Management. Bangladesh Agricultural University. Mymcnsingh-2202. Bangladesh

Abstract/ Executive Summary:

A field experiment was conducted at Bangladesh Agricultural University Farm, Mymensingh, during the Bore season 2006 to evaluate the response of transplanted Bora rice (BRRldhan29) under different irrigation practices. Five irrigation treatments viz. 5 em standing water was maintained throughout the growing season (T₁), 5 cm standing water was applied as soon as water disappeared from the field i.e. saturation was reached (T₂), 5 cm standing water was applied 3 days after disappearing of standing water (T₃), 5 cm standing water was applied 5 days after disappearing of standing water (T₄) and 5 cm standing water was applied 7 days after disappearing of standing water (T₅) were used. Each treatment was replicated thrice. Triple super phosphate (TSP) and muriate of potash (MP) fertilizers were applied before transplanting at the rate of 77 kg/ha and 59 kg/ha, respectively and. urea fertilizer was applied thrice, namely, before transplanting, 20 days after transplanting (DAT) and 35 DAT equally in all treatment plots at the rate of 304 kg/ha. BRRldhan29 was transplanted on 3 February and harvested on 27 May 2006. Irrigation treatments showed significant effects on the yield and yield contributing characters of Boro rice (BRRldhan29). The results showed that the highest grain yield of 9.56 t/ha was obtained in treatment T₂ followed by T₁ (9.51 t/ha) and T₅ gave the lowest grain yield of 7.06 t/ha. It was also found that the reduction in grain yield in T, was 1.79% in comparison to treatment T,. whereas, the water productivity was increased by 25% more than that of T₁. The application of irrigation water 3 days after disappearing of standing water (T₃) together with T₄ and T₅ will considerably save the water but reduced the grain yield significantly. Therefore, from the experimental findings, it may be inferred that 5 em standing water applied 3 days after disappearing of standing water (T₃) produced the satisfactory yield For BRRldhan29.

Keywords: Boro rice, Irrigation practices, Grain yield, Water use, Water productivity

Location: Bangladesh Agricultural University Farm, Mymensingh

Start Date: 00-00-2006

End Date: 00-00-2006

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To develop feasible techniques for studying tolerable water stresses in the Boro rice field with a view to making efficient utilization of irrigation water and maximizing the yield for rice cultivation by reducing excessive loss through water saving.

Methodology:

The experiment was conducted at Bangladesh Agricultural University Farm, Mymensingh during the Boro season of 2006. The study area includes mainly the Old Brahrnputra Floodplain soil. The experimental soil was silty loam. The colour of the soil seemed to be grey, whereas, pH, bulk density, field capacity and wilting point of the soil were 5.48 to 6.36, 1.40 gm/cm³, 27.63% and 14.06%, respectively. The seasonal precipitation was 56.18 cm and the average daily air temperature of the experimental area was 25.850C. The experimental field was prepared by using tractor drawn plough, puddler and ladder (wooden plank or leveler). The experiment was laid out in a randomized complete block design (RCBO) with three replications. Each plot was provided with a calibrated scale to measure the water level depth each day. The size of unit plot was 4 m x 3m. Around each unit plot having levee of 25 em width and 20 cm height was constructed. Each plot was separated by I m buffer zone between the rows and 1.5 m wide buffer zone between the plots along rows to prevent seepage between the adjoining plots.

Triple super phosphate and muriate of potash fertilizers were applied at the final preparation of land at the rate of 77 kg/ha and 59 kg/ha, respectively and urea fertilizer was applied thrice, namely, at the final land preparation, 20 days after transplanting (OAT) and 35 OAT equally in all plots at the rate of 304 kg/ha. The study consisted of the following treatments- 5 cm standing water was maintained throughout the growing season (T₁), 5 cm standing water was applied as soon as water disappeared from the field (T₂) i.e. saturation was reached, 5 cm standing water was applied 3 days after disappearing of standing water (T3), 5 cm standing water was applied 5 days after disappearing of standing water (T₄) and 5 em standing water was applied 7 days after disappearing of standing water (T₅). BRRldhan29 variety selected for the study was an inbred modern variety, developed by the Bangladesh Rice Research Institute in 1995. On an average the growth duration of BRRIdhan29 is about 168 days. The seedlings of the variety were collected from the BAU farm on 2 February, 2006. The seedlings were 10 to 17 cm in height and they were 40 days of age. Transplanting was done on 3 February using 25 cm x 15 cm spacing with 2 seedlings/hill. The matured rice pants were harvested on 27 May 2006. From each plot, 10 sample hills were selected randomly and harvested separately. The rest of the plots were harvested, threshed and weighed in line with 10 sample hills. From each 15 samples, an average weight of 20 to 25 grams of rice grain was taken in the pre-weighted empty basin and weighted again with the samples. The basin with grains was kept in the oven for 24 hours at 105°C and weighed again. Moisture content was then calculated.

Source of Information: Journal of Agricultural Engineering The Institution of Engineers, Bangladesh, Vol. 331 AE. December. 2007

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Hence, it was observed that total water use increased with the increase of irrigation frequency. Alternately, irrigation frequency decreased with the increase of the water stress imposed to different treatments. Similarly, water productivity was the highest (0.098 t/ha/cm) in treatment T₃ followed by treatments T₄ (0.089 t/ha/cm), T₅ (0.088 t/ha/cm) and T₂ (0.087 t/ha/cm), respectively and was found to be minimum (0.079 t/ha/cm) in treatment T₁. From these results, it can be seen that the water productivity decreased with the increase of irrigation water.

Knowledge Management: Journal