蒽酮比色法测定大豆乳清废水中总糖含量

本文研究了用蒽酮比色法测定大豆乳清废水中可溶性总糖含量,本法可溶性总糖测定的回收率为98%~105%,标准偏差1.032×10-3,本法灵敏度高,可靠性强,误差小,而且设备简便、迅速、准确。     

浙江省平原农田林网化的研究

根据浙江省平原地区的特点,依照农作物对农田林网控制的要求,提出了平原农田林网化的规划设计原则、要求和浙江省的分区规划方案。     

Molecular identification of a phytoplasma associated with Sophora Root yellows

A phytoplasma infecting Sophora Root (Sophora alopecuroides) was detected and identified in Alar, Xinjiang Uygur Autonomous Region of China. Typical phytoplasma bodies were observed in sieve tubes of the diseased plants by transmission electron microscopy. A partial 16S rRNA gene and ribosomal protein (rp) genes containing rpl22 (rplV) and rps3 (rpsC) were amplified by direct and nested PCR. Based on the sequence similarity of the 16S rRNA and rp genes with accompanying phylogenetic analyses, the phytoplasma associated with Sophora Root yellows belongs to the 16SrI group (aster yellows group). Virtual RFLP analysis of these 16S rRNA and rp gene sequences showed distinct differences from those of reference phytoplasma strains representing previously described subgroups of the 16SrI group. Moreover, the similarity coefficient (0.92) of the RFLP profile of this phytoplasma was less than the threshold similarity coefficient (0.97) required for subgroup classification. Thus, the phytoplasma isolate of Sophora Root plants, designated as ‘SoRY’, represents a new subgroup. Furthermore, this is the first report of phytoplasma disease associated with Sophora Root plants.     

杨树花粉染色体加倍有效处理时期的研究

以毛新杨（Ｐｏｐｕｌｕｓｔｏｍｅｎｔｏｓａ×Ｐ．ｂｏｌｅａｎａ）为材料,在掌握小孢子母细胞减数分裂过程的基础上,对花粉染色体加倍中减数分裂的有效处理时期以及作用持续时间进行了研究,结果表明：（１）经秋水仙溶液处理所获得的花粉中均有一定比例的形态较大的花粉,最高可达８８％。这种大花粉经花粉染色体检查为２ｎ＝３８,且均能正常萌发。（２）一般只要是在水培４０ｈ左右,花药由淡绿色转为绿黄色以后且未变红前,也就是由细线末期到终变期之前处理,均能取得较好的加倍效果。（３）在有效处理时期内,处理次数与花粉得率也有一定的相关性,考虑２ｎ花粉比率及花粉量得率,处理次数以３～５次,每次间隔５～７ｈ为宜。     

2006年国际市场大豆价格情况及后期走势分析

2006年．国际市场大豆价格延续2005／06年度的跌势小幅下滑，大豆价格总体处于低位运行。11月后期，大豆价格出现异常大幅上涨。预计今后一段时期，大豆市场面临较大的季节性供应压力，炒做题材减弱，将会下行。     

2009年一季度国际粮价情况及后期走势展望

2009年一季度,受到粮食供需宽裕以及全球经济危机的双重影响,国际市场粮食价格低位震荡,3月水平略高于2008年12月,但仍然大幅低于2008年同期水平。从后期来看,全球经济可能维持低迷,国际粮食市场将面临粮食产量增加及库存庞大等不利因素,价格上涨压力较大。     

闽台农业科技交流与合作的现状与对策研究

首先阐述在两岸"三通"的新时代下,两岸农业科技的交流与合作的背景.在此基础上对闽台农业科技交流的现状做一个研究和调查并找出了一些影响农业科技交流的问题.最后总结以上所有研究,提出了解决闽台农业科技交流问题的对策.     

Effects of partial replacement of nitrate with different nitrogen forms on the yield,quality and nitrate content of Chinese kale

In this study, the yields, nutritional qualities and nitrate (NO₃) content of Chinese kale were studied with two cultivars, following partial replacement of nitrate (20%) with ammonium (NH₄), urea and glycine in hydroponics. The results showed that, compared with the full nitrate treatment, ammonium replacement increased the fresh weight by 18.1% and 8.0% of ‘Zaobao’ and ‘Lvbao’ cultivars respectively, whereas urea and glycine replacements decreased the biomass significantly. Adding different nitrogen (N) forms significantly improved the contents of vitamin C, soluble sugar, free amino acid, protein, soluble phenol and flavonoids in Chinese kale. Adding the three alternative N forms also reduced nitrate content significantly, in which glycine replacement was the lowest. According to the results obtained, different forms of N replacement could be used for different purposes. Glycine replacement could be the best alternative only to improve qualities, while ammonium replacement could be the best alternative to improve both the yield and qualities.     

预测二化螟的生物学参数和数学模型

本文研究了种植杂交稻后,二化螟的发育历期、积温、期距、繁殖能力、种群生存率和为害量等参数,并组建了预测模型.     

罗非鱼湖病毒病传入风险分析

为评估罗非鱼湖病毒（tilapia lake virus,TiLV）跨境传入风险,按照OIE传入风险评估框架,从危害识别、风险评估及风险管理3个方面,开展了TiLV跨境传入风险分析,并提出了相应的风险控制措施。分析认为：活的敏感鱼类（包括亲鱼、鱼卵和鱼苗）,用做鲜活饵料的鱼类（野杂鱼）及冰冻和冰鲜的敏感鱼类（包括去除内脏的鱼肉）TiLV传入风险较高,而敏感鱼加工类产品、非敏感鱼类（包括活的和其他形式的产品）及运输活鱼的水、包装、运输工具和用具等传入风险较低。建议不从疫区进口高风险产品,对于低风险产品可以自由贸易,而对运输活鱼的水、包装、运输工具和用具等要进行强制常规消毒。