白玉蜗牛养殖技术

<正> 白玉蜗牛因其头、颈、腹、足、身体肌肉色白如玉而得名。 白玉蜗牛与鱼翅、干贝、鲍鱼并称为世界四大名菜。是一种高蛋白、低脂肪、不含胆固醇的高级保健食品,并能治疗多种疾病,有抗癌功能。近年来,国内喜食蜗牛的人越来越多,尤其在法国、意大利,蜗牛是一大名菜,被视为难得的佳肴。发展养殖蜗牛,成本低、效益高、不受场地和环境的限制,城市家庭阳台、农     

作物育种中三种聚类方法的比较分析

本文对农业系统上目前应用的三种聚类方法进行了比较分析,认为主成份分析聚类的结果与由实际系谱所得到的结果比较相近,是聚类分析中较好的一种方法。     

我国作物栽培科学的发展

作物栽培科学是直接服务于农业生产的一门应用科学。建国后在总结我国丰富的栽培经验的基础上,广泛吸收现代科学技术,逐步建成了独立的科学体系。近十几年来,在区域化、指标化、规范化栽培;周年综合利用自然资源、开拓增产增收途径;提高作物群体光合利用效率及高产栽培;作物高产需肥规律及配方施肥;作物抗逆综合栽培技术;作物栽培机械化、除草化学化、地膜覆盖栽培以及“良种良法”配套栽培等方面取得了很大进展。     

农作物分子育种的研究现状和展望

本文简述了农作物分子育种的优越性及在作物改良上的潜力，阐述了分子育种的进展，指出了存在问题和今后研究方向。     

RESEARCH AND APPLICATION OF CROP PEST MONITORING AND EARLY WARNING TECHNOLOGY IN CHINA

● Crop pests are a major factor restricting agricultural production in China. ● The National Monitoring and Early Warning System (NMEWS) was established > 40 years ago. ● Application of NMEWS has increased national capability to tackle pests. The importance of food security, especially in combating the problem of acute hunger, has been underscored as a key component of sustainable development. Considering the major challenge of rapidly increasing demands for both food security and safety, the management and control of major pests is urged to secure supplies of major agricultural products. However, owing to global climate change, biological invasion (e.g., fall armyworm), decreasing agricultural biodiversity, and other factors, a wide range of crop pest outbreaks are becoming more frequent and serious, making China, one of the world’s largest country in terms of agricultural production, one of the primary victims of crop yield loss and the largest pesticide consumer in the world. Nevertheless, the use of science and technology in monitoring and early warning of major crop pests provides better pest management and acts as a fundamental part of an integrated plant protection strategy to achieve the goal of sustainable development of agriculture. This review summarizes the most fundamental information on pest monitoring and early warning in China by documenting the developmental history of research and application, Chinese laws and regulations related to plant protection, and the National Monitoring and Early Warning System, with the purpose of presenting the Chinese model as an example of how to promote regional management of crop pests, especially of cross border pests such as fall armyworm and locust, by international cooperation across pest-related countries.     

重庆市远郊种植业生产结构模型

本文在深入调查和掌握大量数据的基础上,建立了反映重庆市远郊14区县种植业生产结构的多目标线性规划模型,应用电算模拟技术分析了不同种植业结构模式下的生产资源利用方式及预期经济效果。经系统优化,提供了目前进行种植业结构调整的12个备挥方案。     

川东丘陵区头季稻密度和肥料对再生稻产量的影响

用二次回归正交旋转组合设计法，研究头季稻密度和肥料对再生稻产量的影响，并建立了数学模型，解析了单因子效应和交素作用，得出川东地区头季稻留蓄再生稻最优农艺措施组合方案为：密度３０．７３－３１．５４万窝／ｈａ，Ｎ１２６．２１－１２８．９６ｋｇ／ｈａ，Ｐ２Ｏ５８０．３４－８２．７８ｋｇ／ｈａ，Ｋ２Ｏ９５．４２－１０３．８４ｋｇ／ｈａ，头季稻产量可达８２５０ｋｇ／ｈａ，再生稻产量达３０００ｋｇ／ｈａ以...     

四川小麦穗期蚜虫发生程度预测研究

选用四川省有代表性的５个县（忠县，双流，宜宾，武胜，资中）１１年３月份气象因素和小麦穗期蚜虫发生程度资料，运用模糊综合决策方法，建立了预测模型，用预测因子回代，历史符合率达９４．１２％，１９９１～１９９４年，５月县市实际预测符合率为７５．００％，证明该模型对预测小麦穗期蚜虫发生程度有较好效果。