Effects of rice transplanting density and early irrigation management on barnyardgrass ecological control

Abstract

Abstract: The ecological control of hybrid rice Ⅱyou 2070 on barnyardgrass (Echinochloa crusgalli), with interference density 50 plants·m^-2 mixture planted with rice, and transplanting density 19.8 cm×26.4 cm was higher than that of with transplanting density 19.8 cm×46.2 cm, resulting in barnyardgrass grain husk number reduce by 71%. Hybrid rice Ⅱyou 2070 with transplanting density 19.8 cm×26.4 cm ensured the higher effective panicle numbers and 1000 grain weight and the rice yield of which was 13.3 % higher than that of with rice transplanting density 19.8 cm×46.2 cm. Barnyardgrass could be controlled by deep water at its early stage. However, it appeared that barnyardgrass could not be controlled effectively by deep water when its seedling age was older than 3 leaf stage.

Key words: Cunninghamia laceolata seedling, Al stress, Solution culture, Exogenous nutrient elements, Thresholds

CLC Number:

S512

XU Zhenghao, WANG Yiping, YU Liuqing, A. Martin Mortimer. Effects of rice transplanting density and early irrigation management on barnyardgrass ecological control[J]. cje, 2004, (4): 41-43.

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