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1.培育无病毒西瓜美国科研人员,经5年研究,已培育出4个无病毒的西瓜品系,与目前上市的商业品种相比,在人工接种情况下,抗病品系感病率仅为6％,而商业品种的感病率为95％。目前,这种无病毒西瓜种子仅能供给少数育种者,以便与商业品种杂交,培育新的商用杂交种。预计将抗性性状引入西瓜中还需5年左右的时间。 2.开发新型缓效肥料日本科研人员最近开发了一种以草酰胺为主要成分的新型缓效肥料,其主要特点是:①含氮量高,达31％左右;②化学反应中性,不影响土壤化学特性;③肥效发挥缓慢,缓效性长;④
1. Cultivation of virus-free watermelon American researchers, after 5 years of research, has developed four virus-free watermelon strains, compared with the current commercial varieties listed, in the case of artificial inoculation, the susceptible strain susceptibility was only 6 %, While the prevalence of commercial varieties is 95%. Currently, this virus-free watermelon seed can only be supplied to a few breeders for crossing with commercial varieties and breeding new commercial hybrids. The resistance trait is expected to be introduced into watermelon in about 5 years time. 2. Development of new slow-release fertilizer Japanese researchers recently developed a new oxalamide-based slow-acting fertilizer, its main features are: ① high nitrogen content, up to 31%; ② chemical reaction is neutral, not Affect soil chemical properties; ③ fertilizer to play slowly, slow and long; ④