论文部分内容阅读
1.“利用核技术改良草场管理研究”协调会 1986年3月10—14日在维也纳召开(本刊1986年第3期第53页已有报道).2.“关于同位素研究蓝绿藻和红萍固氮及氮循环研究”协调会 1986年5月5—9日在菲律宾国际水稻所召开。红萍用作绿肥(60kgN/ha)使水稻增产28—110％,其作用与等氮量的尿素相同。在多数情况下,水稻分蘖期施用红萍或尿素,~(15)N 回收率高于插秧期施用。初步认为,红萍可用作绿肥代替等氮量的尿素.3.“关于提高拉丁美洲菜豆产量和固氮研究”协调会 1986年12月16—20日在巴西皮拉西卡巴召开。与会者认为有可能利用核技术在拉丁美洲达到研究目标。菜豆产量甚低,其原因在于缺氮:农民无力购买化肥,共生体的固氮能力低,用选出的根瘤菌株接种不易提高固氮效率。而形成高效固氮共生体的主要障碍,在于寄主植物的潜力较低。因而培育共生固氮性状优良的豆科作物品种,最有希望较多地提高固氮量。
1. The Coordination Meeting for Studies on the Use of Nuclear Techniques to Improve Pasture Management was held in Vienna from 10 to 14 March 1986. (No. 3, 1986, p. 53, already reported) .2 On the isotope studies of blue-green algae and Red Ping nitrogen and nitrogen cycle research "Coordination May 5-9, 1986 held in the Philippines International Rice. The application of Hongping as green manure (60kgN / ha) can increase the yield of rice by 28-110%, which has the same effect as urea with the same nitrogen content. In most cases, the application of Rhizoma Phyllostachys pubescens or urea at tillering stage showed higher recovery of ~ (15) N than during the transplanting period. It is initially believed that Hongping can be used as urea to replace nitrogen fertilizer with green manure.3 The Coordination Meeting on Improving the Yield and Nitrogen Fixation of Beans in Latin America was held December 16-20, 1986 in Piracicaba, Brazil. Participants saw the possibility of using nuclear techniques to reach their research goals in Latin America. The low yield of kidney bean is due to the lack of nitrogen: farmers are unable to buy chemical fertilizers, and the symbiont has low nitrogen fixation capacity. Inoculation with the selected rhizobium strain is not easy to increase nitrogen fixation efficiency. The main obstacle to the formation of efficient nitrogen fixation symbionts is the lower potential of host plants. Thus cultivating leguminous crops with symbiotic nitrogen fixation is the most promising species to increase the amount of nitrogen fixation.