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在自然种植条件下研究了强化感水稻品种“P1312777”不同叶期(3～6叶)、不同器官(根、茎、叶)水浸提液对稗草根长的抑制率,比较了不同极性树脂处理后水稻根系分泌物水溶液的抑制率变化。结果表明:在3～6叶期相同水稻器官比较,均以5叶期浸提液抑制率最高;5叶期水稻不同器官比较,以叶的浸提液抑制率最高;土培至6叶期的水稻根系分泌物水溶液的抑制率为47．06％,经极性树脂ADS-21处理后抑制率增强为64．71％,经非极性树脂ADS-5处理后抑制率减弱为26．47％;水培至6叶期的水稻根系分泌物水溶液的抑制率为38．24％,经ADS- 21处理后抑制率增强为58．82％,经ADS-5处理后抑制率减弱为20．59％。因此水稻“P1312777”根系分泌物中化感物质以非(弱)极性物质为主,极性物质减弱了非(弱)极性物质的化感抑草作用。
Under natural conditions, the inhibitory rates of water extracts from different organs (roots, stems and leaves) on the growth of barnyardgrass root at different leaf stage (3 ~ 6 leaves) of P1312777 were studied. The effects of different polarity Changes of inhibitory rate of rice root exudates aqueous solution after resin treatment. The results showed that the inhibition rate of the five-leaf stage extracts was the highest in the same rice organs at 3 ~ 6 leaf stage. The inhibition rate of leaf extracts was the highest in different organs at 5 leaf stage. The inhibitory rate of rice root exudates in aqueous solution was 47.06%, the inhibition rate increased by 64.71% after treated with polar resin ADS-21, and decreased to 26.47 after treated with non-polar resin ADS-5 %. The inhibition rate of aqueous solution of rice root exudates from hydroponics to 6-leaf stage was 38.24%, the inhibition rate increased 58.82% after ADS-21 treatment, and decreased to 20 after ADS-5 treatment. 59%. Therefore, allelochemicals in root exudates of rice “P1312777” are dominated by non (weak) polar substances that weaken the allelopathic weeds of non (weak) polar substances.