The application of allelopathic plant materials combined with an agricultural production method is a concept that can be used to manage weeds during rice production. This research investigated the effects of the utilization of Bidens pilosa var. radiata integrated with water irrigation for weed control and rice production. B. pilosa and water extract exerted more toxicity against Echinochloa crus‐galli than the extracted residue applied at the same rates, suggesting that weed control was caused by compounds extracted from B. pilosa. The changes in water properties after the application of B. pilosa were explored. Dissolved oxygen was rapidly reduced after application and then slowly increased within 3–5 days after application (DAA), while the pH also decreased at the early stage and then increased back to normal values within 1–3 DAA. Electrical conductivity increased with increasing rates of application, suggesting that allelochemicals were released from B. pilosa. The concept was studied under field conditions. B. pilosa was applied along with irrigation at 7 days after sowing (DAS) on a direct wet seed system. The results showed that application rates of 2, 4 and 6 tons ha⁻¹ decreased the number of weeds by 52.16, 86.73 and 95.18% at 30 DAA and reduced dried weight of weeds by 17.65, 34.69 and 86.82%, respectively. The rice yield showed an increase of 72.73, 81.03 and 73.66% when compared with the nonweeded crop, while herbicide treatment increased by 84.68%. The findings demonstrate that the application of B. pilosa integrated with water irrigation was able to control weeds in a direct seeded rice production system.

中文翻译：

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Bidens pilosa var。的利用 放射状（Sch。Bip。）Sherff与水灌溉相结合，可防治稻田杂草和水稻产量

化感植物材料结合农业生产方法的应用是一个概念，可用于水稻生产过程中的杂草处理。这项研究调查了Bidens pilosa var的利用效果。辐射与水灌溉相结合，可控制杂草和水稻生产。三叶鬼针草和水提取物施加针对更毒性稗比施加在相同速率下提取残渣，这表明杂草控制是通过从提取的化合物引起的三叶鬼针草。B. pilosa施用后水的性质变化被探索了。溶解氧在施用后迅速减少，然后在施用后3–5天内缓慢增加，而pH值也在早期下降，然后在1-3 DAA内又恢复到正常值。电导率随施用率的增加而增加，表明化感化学物质已从B. pilosa中释放出来。在野外条件下对该概念进行了研究。播种（DAS）后第7天，在直接湿种子系统上施用pilosa芽孢杆菌。结果表明，施用量为2、4和6吨ha ^-1在30 DAA下，杂草数量减少了52.16％，86.73％和95.18％，杂草干重分别减少了17.65％，34.69％和86.82％。与非杂草相比，水稻产量增加了72.73％，81.03％和73.66％，而除草剂处理增加了84.68％。研究结果表明，将B. pilosa与水灌溉相结合的应用能够在直接播种水稻生产系统中控制杂草。