对改进灌排机械化公共服务短板的建议

<正>一、灌排机械化设施现已成为城乡公共服务的短板多年来,四川省推进"城乡统筹发展"战略,实施"再造一个都江堰"、"新增100亿斤粮食生产能力"、植树造林、环境治理、改善生态等一系列重大民生基础工程建设,全省"抗大灾防大洪"和"农业增产增收"的能力有显著改善。但不可否认的是,除局部地方外,大多数     

烟用除草剂的除草效果及烟叶农药残留分析

通过对4种烤烟推荐使用除草剂25％宝成、40％烟舒、72％大田净、50％大惠利的除草效果试验及残留分析，结果表明，4种推荐除草剂对杂草均有较好的防效，总体防效均在87％以上，且对烤烟安全，4种药剂在烟叶中的残留量以25％宝成最低，40％烟舒次之，50％大惠利最高。     

Harmful and economic thresholds for rodent pests in the Alxa desert area under different grassland utilization patterns北大核心CSCD

The rodent damage threshold and the rodent economic threshold are indicators that must be clearly defined in the practice of grassland rodent prevention and control. Different grassland types or different utilization methods of the same grassland type have completely different values for these two indicators. The damage threshold is the population density of pests at which the grassland is obviously compromised, and the economic threshold is the population density at which further pest population increases will cause economic losses. The Alxa desert region is ecologically fragile, and rodents are endemic. This study selected continuous grazing areas and prohibited grazing areas in the desert area of Alxa Left Banner and from 2015 to 2019 to investigated the species and density of pests using the ‘mark and recapture’ method, together with sampling to investigate the aboveground plant biomass in the sample area in August. The measured rodent unit densities and their daily food intakes were used to estimate the amount of forage loss, and a regression equation was used to obtain a fitted relationship between the rodent density and the ratio of forage loss. It was found that: 1) The fitted curves for the ratio of pest density and forage loss in the continuous and prohibited grazing areas took the form of logistic three-parameter, S-shaped curves. 2) According to the regression equation, the damage threshold in continuous grazing areas was 26 standard rodent units·ha-1 and the economic threshold was 39.3 standard rodent units·ha-1. In prohibited grazing areas, the damage threshold was 33.2 standard rodent units·ha-1 and the economic threshold was 30.2 standard rodent units·ha-1. Thus, the economic threshold pest density of continuous grazing areas was slightly higher than that of prohibiting grazing areas. © 2022 Editorial Office of Acta Prataculturae Sinica. All rights reserved.     

烤烟普通花叶病毒病田间自然传播能力研究

通过田间试验,研究了8类不同有效成分农药对烟草病毒病的防治效果.结果表明:8类参试药剂中除18%抑毒星和0.5%抗毒丰在烤烟生长前期对病毒病的预防有微弱效果外,其他参试药剂对烟草病毒病均未表现出预防效果,烤烟在有病原存在的情况下,施药预防与不施药预防几乎没有区别.     

浅析兴安盟沙果发展现状及栽培技术

文章以兴安盟沙果为研究对象，通过对兴安盟沙果产地环境、果品特性、产业发展现状及栽培管理技术进行分析，为兴安盟做大、做强小沙果大产业提供理论基础。