摘要
本试验对稀土提高棉花抗枯萎病和增产作用进行了研究。结果表明,300mg/kg稀土溶液处理种子,发病率可降低18.96％～11.45％,病情指数降低25.60～17.43,相对防效分别为29.19％～39.3％,与多菌灵的防病作用相当。棉株生长和结铃数明显增加,皮棉增产率为19.35％～8.25％。低浓度稀土溶液(500mg/kg、100mg/kg)有一定抗病增产作用,高浓度(50mg/kg,1000mg/kg)则效果不明显,甚至产生药害。
Rare-earths containing different elements were applied to seeds of four upland cotton cultivars, two susceptible (Dai 16 and Jin 11) and to resistant (Zhong 12 and Chuan 73~27) to cotton wilt (Fussrium axysporum f. sp. vasinfectum), Rare-earth treatment at 300 mg/kg significantly enhanced wilt resistance of various cultivars:the rate of diseased plants was reduced by 18. 96% , 12. 08% , 15. 47% and 11. 45% ,the disease index was decreased by 22. 78,25. 60,19. 08 and 17. 43,the relative efficency of wilt prevention was 29. 19%, 29. 22%, 39. 23% and 29. 26%, and seed cotton yield was increased by 11. 4%, 19. 8%,8. 3 and 9. 6%,respectively,for the four cultivars mentioned above. The effect of rare earths of disease prevention and yield improvement appeared comparable with that of carbendozol. Rare earth solution at lower concentrations (50 or 100 mg/ kg)showed little, if any, effect of disease prevention and yield improvement, whereas at higher concentrations (500 or 1 000 mg/kg)the solution injured the plants.
出处
《西南农业大学学报（自然科学版）》
CSCD
1995年第1期28-31,共4页
Journal of Southwest Agricultural University
关键词
稀土
棉花
枯萎病
增产效应
rare earth series
cotton
blight
correlation analysis
