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最近四年来,我每年都向化学小组的学生介绍“矿物肥料”这一课题。我希望通过这一课题,使学生对各种肥料:氮肥、磷肥和钾肥有一个具体而完整的概念,让他们认识各种肥料,懂得各种肥料对植物生长和发育的影响,知道制备各种肥料的矿物原料及其工业制法。要达到这些目的,有下列各种方法:由小组成员阅读通俗科学读物,组织制备肥料及说明肥料对植物生长发育影响的实验,解答检验肥料的实验习题及有关的计算题,制备附有实物样品的图表,参观农业展览馆、工艺博物馆、生产肥料的工厂及使用肥料的农业化学站,并参加集体农庄及国营农场的劳动等。小组通常由九及十年级学生15—20人组成。为了进行实习作业,可将小组成员再分成小小组,每三人一个小小组。通常可由一部分小小组较深入地研究氮肥,另一部分——磷肥,第三部分——钾肥。在解答检
For the past four years, I have introduced the topic of “mineral fertilizers” to chemistry students every year. I hope that through this project, students will have a concrete and complete concept of various fertilizers: nitrogenous fertilizers, phosphate fertilizers and potash fertilizers so that they will know various fertilizers and understand the effects of various fertilizers on the growth and development of plants. Fertilizer mineral raw materials and its industrial production method. In order to achieve these goals, there are various methods for reading popular science readings by group members, organizing the preparation of fertilizers and experiments on the effects of fertilizers on the growth and development of plants, answering the questions on the testing of fertilizers and related calculation questions, , Visits to agricultural exhibition halls, craft museums, factories producing fertilizers and agrochemical stations using fertilizers, as well as taking part in collective farms and state farm labor. The group usually consists of 15-20 students in grades nine and ten. For internships, group members can be subdivided into smaller groups, with a small group of three. Nitrogen can often be studied more in-depth by a small group of subgroups - the other part - the phosphate fertilizer and the third part - the potash fertilizer. In the check seized