%0 Journal Article
%T THE NUTRIENT INPUTS, OUTPUTS AND BALANCE OF PAULOWNIA CROP INTERCROPPING SYSTEM<br>农桐复合系统营养元素的输入、输出与平衡分析
%A YANG Xiu
%A <br>杨修
%A 李文华
%J 资源科学
%D 1998
%I 
%X Analytical results of nutrient inputs, outputs and balance of Paulownia -crop intercropping system revealed that the annual uptake of N, P, and K in current Paulownia -crop intercropping system are 276.2 kg, 92.1 kg, and 172.2 kg per hectare respectively, and the annual inputs of N, P, and K are 370.1 kg, 181.5 kg, and 113.5 kg accordingly; the ratios of inputs to outputs are 1.34 for N, 1.97 for P, and 0.66 for K, indicating a positive balance of N and P in the system whereas negative for K; the inputs of organic nutrients are relative low, for the input of organic N is only 68% that of the inorganic N and the input of organic P is only 21% that of inorganic P; the input ratio of N, P and K is inharmonious, for the nutrient inputs are N: P: K = 1: 0.49: 0.31 while the nutrient uptakes of trees and crops are N: P: K = 1: 0.33: 0.62. The input of P is relative high while K is relative low than what it should be.
%K Paulownia
%K -crop intercropping system
%K Nutrient elements
%K Input
%K Output
%K Balance<br>农桐复合系统
%K 营养元素
%K 输入
%K 输出
%K 平衡
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=B5EDD921F3D863E289B22F36E70174A7007B5F5E43D63598017D41BB67247657&cid=B47B31F6349F979B&jid=9DEEAF23637E6E9539AD99BE6ABAB2B3&aid=688CA8C43FC1B6784A16CB45E1CDBEB9&yid=8CAA3A429E3EA654&vid=A04140E723CB732E&iid=E158A972A605785F&sid=2001E0D53B7B80EC&eid=2A3781E88AB1776F&journal_id=1007-7588&journal_name=资源科学&referenced_num=0&reference_num=6