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1978年12月11—15日,粮农组织和国际原子能机构在科伦坡召开了“同位素及辐射在土壤-植物相互关系研究中的应用”国际学术讨论会,有来自十九个国家和两个国际组织的67名代表参加。在应用~(15)N 研究氮肥方面,罗马尼亚对氮的损失和氮肥效果做了评价;象牙海岸和北喀麦隆介绍了高梁、玉米利用氮肥的研究;希腊对豆科植物灌浆期叶面施氮导致不良结果做了详细报道。美国和罗马尼亚获得的研究结果表明,粮食作物晚期施用氮肥,其利用率高于早期,这是由于有更多的氮直接进入了籽粒。东德对冬小麦春季表层施肥的结果也表明,氮素被植物吸收的时间越晚,氮进入籽粒的比例越大。
December 11-15, 1978, FAO and the International Atomic Energy Agency held an international symposium on the application of isotopes and radiation in soil-plant interactions in Colombo, with representatives from 19 countries and two international organizations 67 delegates attended. In terms of application of nitrogen fertilizer in ~ (15) N, the loss of nitrogen and the effect of nitrogen fertilizer were evaluated in Romania; the application of nitrogen fertilizer to sorghum and corn was introduced in Ivory Coast and North Cameroon; and the nitrogen application to foliage of leguminous plants at grain filling stage in Greece Bad results made a detailed report. Research from the United States and Romania shows that the late application of nitrogen fertilizer to food crops is more efficient than the earlier ones due to more nitrogen entering the grain directly. The results of spring wheat surface fertilization by winter in East Germany also showed that the later the nitrogen was absorbed by plants, the greater the proportion of nitrogen entering the grain.