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Effect of Plant Nutrient and Weed Management in Direct Wet Seeded Boro Rice

MAR Sarkar
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

SK Paul
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

U Pa
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted at the Farm of Farm Management Division, Bangladesh Agricultural University, Mymensingh during December 2012 to June 2013 to find out the effect of plant nutrient and weed management in direct wet seeded Boro rice. The experiment consisted of six nutrient management viz. Control (No manure- PM and N-P-K-S-Zn), PM at 5 t ha^-1, recommended dose of prilled urea (PU) and other inorganic fertilizers (i. e. 120, 60, 40, 10 and 5 kg of N, P₂O₅, K₂O, S and ZnSO₄, respectively), full dose of Urea Super Granules (USG) and other inorganic fertilizers (i. e. 60, 40, 10 and 5 kg of P₂O₅, K₂O, S and ZnSO₄, respectively) 2.7 g USG + PM at 5 t ha^-1, 2.7 g USG + PM at 2.5 t ha^-1; and three weeding regimes, viz. Unweeded control, hand weeding thrice at 20, 35 and 50 days after sowing (DAS); and Panida (Pandimethalin) @ 2.5 l ha^-1 and hand weeding once at 20 DAS. The highest plant height (90.29 cm) was obtained in full dose of USG and other inorganic fertilizers (i. e. 60, 40, 10 and 5 kg of P₂O₅, K₂O, S and ZnSO₄ respectively) and the lowest one (82.42 cm) was from control (No manure- PM and N-P-K-S-Zn). The highest number of effective tillers hill^-1 (14.00) was obtained in recommended dose of PU and other inorganic fertilizers (i. e. 120, 60, 40, 10 and 5 kg of N₂, P₂O₅, K₂O, S and ZnSO₄ respectively) whereas the lowest effective tillers hill^-1 9.15 was obtained from control (No manure- PM and N-P-K-S-Zn). The highest number of grains panicle^-1 (75.23) was observed in nutrient 2.7 g USG + PM at 5 t ha^-1 and the lowest one (59.01) was obtained from PM at 5 t ha^-1.The highest plant height (90.57 cm) was obtained in Panida (Pandimethalin) @ 2.5 l ha^-1 and hand weeding once at 20 DAS and lowest plant height (83.98 cm) was obtained in un weeded control. The maximum grain yield (3.71 t ha^-1) was obtained from the application of 2.7 g USG + PM at 2.5 t ha^-1 and the lowest (1.15 t ha^-1) was from control (No manure- PM and N-P-K-S-Zn). The highest grain yield (3.8 t ha^-1) was obtained in Panida (Pandimethalin) @ 2.5 l ha^-1 and hand weeding once at 20 DAS and the lowest one (1.26 t ha^-1) was obtained from unweded control. In case of interaction, the highest number of effective tillers hill^-1 (17.00) was obtained in recommended dose of PU and other inorganic fertilizers (i.e. 120, 60, 40, 10 and 5 kg of N, P₂O₅, K₂O, S and ZnSO₄ respectively) with hand weeding thrice at 20, 35 and 50 DAS and the lowest one (7.27) was observed in control (No manure- PM and N-P-K-S-Zn) with no weeding. The highest grain yield (5.29 t ha^-1) was obtained in 2.7 g USG + PM at 2.5 t ha^-1 with Panida (Pandimethalin) @ 2.5 l ha^-1 and hand weeding once at 20 DAS which was statistically identical with 2.7 g USG + PM at 5 t ha^-1 and Panida (Pandimethalin) @ 2.5 l ha^-1 and hand weeding once at 20 DAS and the lowest grain yield (0.65 t ha^-1) was obtained in the interaction of unweeded and unfertilized control (No manure- PM and N-P-K-S-Zn). Boro rice (cv. BRRI dhan28) can be cultivated with 2.7 g USG applied at the centre of the four hills in each alternate row + PM at 2.5 t ha^-1 with Panida (Pandimethalin) @ 2.5 l ha^-1 and hand weeding once at 20 DAS for appreciable grain yield.

Keywords: Plant nutrient, Weed management, Direct wet seeded, Boro rice, USG

Location: Farm Management Division, Bangladesh Agricultural University, Mymensingh

Start Date: 00-12-2012

End Date: 00-06-2013

Program Area: Crop-Soil-Water Management

Commodity: Weed management, Rice

Objectives:

The present study was undertaken to observe the effect of plant nutrient and weed management in direct wet seeded boro rice.

Methodology:

The experiment was conducted at the Farm of Farm Management Division, Bangladesh Agricultural University, Mymensingh from December 2012 to June 2013. The experimental site belongs to the Old Brahmaputra floodplain (AEZ-9) with non-calcareous dark-grey floodplain soil. The land was medium high with silty loam texture having pH 6.8, available N 0.13%, P 13.9 ppm, organic carbon 0.93%, K 16.3 ppm and low in organic matter content. The experiment consisted of six nutrient management viz. Control (No manure- PM and N-P-K-S-Zn), PM at 5 t ha^-1, recommended dose of prilled urea (PU) and other inorganic fertilizers (i. e. 120, 60, 40, 10 and 5 kg of N, P₂O₅, K₂O, S and ZnSO₄, respectively), full dose of Urea Super Granules (USG) and other inorganic fertilizers (i. e. 60, 40, 10 and 5 kg of P₂O₅, K₂O, S and ZnSO₄, respectively), 2.7 g USG + PM at 5 t ha^-1and 2.7 g USG + PM at 2.5 t ha^-1 and three weeding regimes viz.Unweeded control, hand weeding thrice at 20, 35 and 50 days after sowing (DAS) and Panida (Pandimethalin) @ 2.5 l ha^-1+ hand weeding once at 20 DAS. The experiment was laid out in a randomized complete block design with three replications. The size of unit plot was 4.0 m × 2.5 m. The distances between blocks and plots were 1 m and 75 cm, respectively. Sprouted seeds of BRRI dhan28 were sown on puddled field having no standing water on 15 February 2013 with four seeds hill^-1 at 25 cm ×15 cm spacing. The land was fertilized with as per treatment specification. Whole amount of TSP, MoP, gypsum, zinc sulphate and PM were applied at final land preparation. Urea was applied in three equal splits as top dressing at 15, 30 and 50 DAS. As per experimental specification USG were placed at 8 cm depth at 15 DAS in the center of four hills in each alternate row with hand using a graduated bamboo stick. Five hills (excluding border rows) from each plot were randomly selected, uprooted and properly tagged prior to harvest for recording data on crop characters and yield components. The crop of central 5 m² area of each plot was harvested on 25 June 2013. The harvested crop was bundled plot-wise separately, tagged properly and brought to the clean threshing floor. The bundles were sun dried, threshed and then grains were cleaned and weighed. The grain yield was adjusted to 14% moisture content. Straws were also sun dried properly. Grain and straw yields were then converted to t ha^-1. The collected data were analyzed statistically following the ANOVA technique and the mean differences were adjudged by Duncan’s Multiple Range Test (Gomez and Gomez, 1984) using a statistical computer package program MSTAT-C.

Source of Information: Progressive Agriculture 27 (4): 466-472, 2016

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Achievement/Findings:

From the present study it can be concluded that Boro rice can be cultivated with 2.7 g USG at the centre of four hills in each alternate row + PM at 2.5 t ha^-1 with Panida (Pandimethalin) @ 2.5 l ha^-1 and hand weeding once at 20 DAS for appreciable grain yield. This practice will in turn be beneficial for soil health and environment.

Knowledge Management: Journal