摘 要：本实验通过计算机调控营养液供液方式方法，用不同基质配方栽培番茄，测定番茄各个时期叶片中N、P、K无机养分的含量，旨在发现番茄各时期无机养分的吸收规律，为无土栽培养分调控提供参考依据。研究结果表明：不同基质配方对番茄叶片中N、P、K的含量没有极显著性差异。番茄叶片中的N元素在整个生长期内呈下降的趋势，最高出现在移栽后60天，为48.13mg/g，最低出现在移栽后300天，为43.42 mg/g； P元素含量先高后低，最高出现在移栽后180天，为6.23 mg/g，最低出现在移栽后300天，为3.45mg/g；K含量先低后高，最高出现在移栽后300天，为24.96mg/g，最低出现在移栽后120天，为8.45mg/g。

Abstract: In this paper, computer was used for regulating the nutrition solution supplying system. In order to discover the law of absorbing of inorganic nourishment of greenhouse tomato growth in soilless culture, the N、P、K concentrations in tomato leaf were measured at different growth stages. It can supply support for nutrition solution regulation with soilless culture. The consequence was that there was no significant difference in N, P, K concentrations in different substrates. The result was that the accumulative trend of N was decreased, the highest content of N was 48.13 mg/g after plant out 60 days, and the lowest was 43.42 mg/g after plant out 300 days; The accumulative trend of P was increased firstly, then was decreased. The highest content of P was 6.23 mg/g after plant out 180 days, the lowest was 3.45 mg/g after plant out 300 days; The accumulative trend of K was decreased firstly, and then increased. The highest content of K was 24.96mg/g after plant out 300 days, the lowest was 8.45mg/g after plant out 120 days.