除草安全剂奈安不同施用浓度对烟草生长发育的影响

湖南等全国各大烟区实行的是烟稻水旱轮作制度,为有效降低上茬作物水稻除草剂二氯喹啉酸的残留,减轻对下茬作物烟草的药害,找出奈安最佳使用浓度和方法,开展了除草安全剂奈安对烟株生长发育影响的试验。结果表明:在农艺性状、生理生化指标、化学成分方面,奈安施用浓度不是越高越好,应该按照其最佳浓度进行喷施,少则不能完全缓解除草剂的毒害作用,多则不但不会挽回损失,甚至还会带来更严重的毒害作用,实际生产中要严格尊重适量原则。通过本试验可以推测除草安全剂奈安合理施用浓度应该是在1 200 g/hm2左右。

Effects of Different Application Concentrations of Herbicide Safener Naian on Growth and Development of Tobacco

Hunan is the major areas of tobacco rice paddy rice-upland crop rotation system. In order to reduce the herbicide residue of quinclorac in stubble crop rice effectively , reduce the harm to the next stubble crops of tobacco , find out optimum concentration and apply method of Naian , the experiment was carried out to study the effect of herbicide safener Naian on growth and development of tobacco. The results showed that considering the agronomic characters , physiological and biochemical index , chemical composition , etc , the concentration of Naian is not the higher the better , and it should be sprayed in accordance with its optimum concentration. If the amount is less , then the toxicity of the herbicide can not be completely alleviated. If the amount is more , then the loss can not be retrieved , or even bring more serious toxicity. In the actual production , it should be strictly applied by the principle of appropriate amount. Through the experiment , it's presumed that the reasonable application concentration of herbicide safener Naian should be around 1 200 g/hm 2 .