果树生产技术经济效益评价的两个问题——育苗的经济效益和栽植密度与产量的关系  

THE TWO RESPECTS OF THE EVOLUATION OF RESULTOF POMOLOGICAL CULTURAL TECHNOLOGIES-The economic result of methods of raising seedlings and the ralations of production and density of appie tree.

作　　者：王有年[1] 姚允聪[1] 沈瑞骞 李金光[1] 

机构地区：[1]北京农学院园艺系

出　　处：《北京农学院学报》1992年第2期145-151,共7页Journal of Beijing University of Agriculture

摘　　要：本文用对比分析法研究了薄膜与露地育苗的经济效益,同时通过实例确定了苹果栽培密度与产量的关系:Y=ax^2+bx+c。介绍了研究这种关系的方法,编制了两个问题研究时实施计算的BASIC程序。In this paper, comparsive analysis were made on two methods of ofraising seed- lings from economic results to cultured density of oftrees were metabolished as a model: Y=ax2+bx+c the results obtainsfrom a BASIC programme at PC-386 computer.

关 键 词：苹果 育苗 栽植密度 产量 

分 类 号：S[农业科学]