PHYTOTOXIC STRESS OF RICE (ORYZA SATIVA L.) AND WHEAT (TRITICUM AESTIVUM L.) STRAW AGAINST BARNYARD GRASS (ECHINOCHLOA CRUS-GALLI (L.) P. BEAUV.)Prachi Rajput* and Pasumarti Bhaskara Rao
Laboratory and greenhouse experiments were conducted with different rice (Oryza sativa L.) and wheat (Triticum aestivum L.) varieties to extenuate barnyard grass (Echinochloa crus-galli (L.) P. Beauv.). In laboratory, by using 10 aqueous extracts of all varieties maximum per cent reduction on germination () and rate of germination was observed with VL Dhan 85 of rice (55 and 58 ) and MACS 6272 of wheat (73 and 71), respectively while length and dry weight with both Govind of rice and RAJ 4077 of wheat. Furthermore, seven varieties of rice and wheat were selected for pot experiments with three different quantities of straw (5, 10 and 20 g). Basmati 370 (64) and MACS 6272 (54) on seed germination; VL Dhan 85 (70) and MACS 6272 (58) on height; Govind on dry weight (root 77, stem 61, and leaves 62); and PBW 550 (stem 55 and leaves 64), RAJ 4077 (root 82) with 20 g straw caused maximum reduction. Generally, the effect was increased with increasing quantity of straw. These results revealed that these varieties exhibited innate phytotoxic potential which can be exploited to prepare biodegradable bioherbicides for the control of barnyard grass.
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