论文部分内容阅读
一、观察的动机和目的尽人皆知,在农业生产实践的过程中不同槎口农田地的肥力是不相同的;对槎口的好坏过去多赁生产上的经验来判断。作物对于土壤中养分的吸收利用,过去的试验也多为盆栽试验,缺少作物生长期间田间土壤养分动态变化的记载。因此,我组为了对不同槎口田地的土壤肥力取得科学资料及搞清在作物生长期间田间土壤养分的动态变化,以充实教材和指导生产起见,自55年5月起至56年10月止在本组轮作
First, the motivation and purpose of observation is well known. In the process of agricultural production practice, the fertility of different farmland is not the same. Judging from the past experience of producing farmland, we can judge the fertility of farmland. Crops for the absorption and utilization of nutrients in the soil, the past tests are mostly potted plants, the lack of crop growth during the dynamic changes of soil nutrients recorded in the field. Therefore, in order to obtain scientific information on the soil fertility of different fields and to clarify the dynamic changes of soil nutrients in the fields during crop growth, in order to enrich the teaching materials and guide the production, our group started from May 55 to October 56 In this group rotation