A study was
conducted in a split-plot design to evaluate the effect of fertilizer placement
method on weed growth and grain yield in a dry-seeded rice (DSR) system.
Main-plot treatments were four fertilizer placement methods: between narrow
rows (between 15-cm-wide rows of the pattern 25-15-25 cm), between uniform rows
(between 20-cm-wide rows), within uniform rows, and surface broadcast. Subplot
treatments were three weed control methods: herbicide-treated, nontreated, and
weed-free. Weed biomass was greater in the nontreated plots than in the
herbicide-treated plots. Herbicide application reduced weed biomass by 89% to 99% compared with the
nontreated control. Fertilizer placement did not influence weed biomass in the
herbicide-treated plots; however, it greatly influenced biomass in the
nontreated plots. Fertilizer placement on the surface increased weed biomass (69-71 g·m–2)
compared with the placement of fertilizer below the soil surface (37-57 g·m–2).
Fertilizer placement did not influence weed density and biomass at 60
days after planting. Nontreated plots yielded 700 to 2080 kg·ha–1.
Grain yield was similar between the herbicide-treated (2660-3250 kg
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R. E. Blackshaw, L. J. Molnar and H. H. Janzen, “Nitrogen Fertilizer Timing and Application Method Affect Weed Growth and Competition with Spring Wheat,” Weed Science, Vol. 52, No. 5, 2004, pp. 614-622.
A. P. Everaarts, “Response of Weeds to the Method of Fertilizer Application on Low-Fertility Acid Soils in Suriname,” Weed Research, Vol. 32, No. 5, 1992, pp. 391-397. doi:10.1111/j.1365-3180.1992.tb01900.x
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B. S. Chauhan, V. P. Singh, A. Kumar and D. E. Johnson, “Relations of Rice Seeding Rates to Crop and Weed Growth in Aerobic Rice,” Field Crops Research, Vol. 121, No. 1, 2011, pp. 105-115.
B. S. Chauhan and J. Opeña, “Effect of Tillage Systems and Herbicides on Weed Emergence, Weed Growth, and Grain Yield in Dry-Seeded Rice Systems,” Field Crops Research, Vol. 137, No. 1, 2012, pp. 56-69.
D. B. Ishaya, S. A. Dadari and J. A. Y. Shebayan, “Evaluation of Herbicides for Weed Control in Three Varieties of Upland Rice (Oryza sativa L.) in the Nigerian Savannah,” Crop Protection, Vol. 26, No. 10, 2007, pp. 1490-1495. doi:10.1016/j.cropro.2006.12.015
B. S. Chauhan and S. B. Abugho, “Effect of Growth Stage on the Efficacy of Postemergence Herbicides on Four Weed Species of Direct-Seeded Rice,” The Scientific World Journal, 2012, Article ID: 123071, 7 p.
R. E. Blackshaw, G. Semach and H. H. Janzen, “Fertilizer Application Method Affects Nitrogen Uptake in Weeds and Wheat,” Weed Science, Vol. 50, No. 1, 2002, pp. 634-641.
V. L. Cochran, L. A. Morrow and R. D. Schirman, “The Effect of N Placement on Grassweeds and Winter Wheat Responses in Three Tillage Systems,” Soil Tillage Research, Vol. 18, No. 4, 1990, pp. 347-355.