优良品种对农业增产起着巨大作用,在实现农业现代化过程中,优良品种不仅应具有高产、稳产、早熟等优良性状,而且在其他方面也对优良品种提出了要求.品质要优良.粮食作物应当重视蛋白质含量的提高和多种氨基酸合理均衡、尤其是要重视提高人畜所必需的赖氨酸、色氨酸的含量。对大豆的要求是降低亚麻油酸含量,以解决豆油容易败坏变味的问题.对蔬菜、水果则要求提高维生素和糖分的含量,同时本着便于加工贮藏和远途运输方面改善品质,对西瓜,葡萄则要求无籽品种.要能抵抗多种主要病虫害。大量使用农药不仅会提高生成本,还会使害虫和病原菌产生抗药性,减低防治效果.农药还会造成环境污染和农产品带有 Good varieties play an important role in increasing agricultural output. In the process of agricultural modernization, fine varieties should not only have excellent traits such as high yield, stable yield and early maturity, but also put forward requirements on fine varieties in other aspects. The quality of grain crops should be good Emphasis on improving the protein content and a reasonable balance of a variety of amino acids, in particular, should pay attention to improving the necessary human and animal lysine, tryptophan content. Soybean is required to reduce the content of linoleic acid in order to solve the problem of soybean oil easily spoiled taste.For vegetables, fruits are required to increase the content of vitamins and sugars, while in line with the convenience of processing and storage and long-distance transport to improve the quality of watermelon, Grapes require seedless varieties that are resistant to many major pests and diseases. Large-scale use of pesticides will not only increase the cost of production, but also make the pests and pathogens produce drug resistance and reduce the effect of prevention and control. Pesticides can also cause environmental pollution and agricultural products