TOPSIS for Screening Seedling Substrate Mineral Nutrient Extraction Method
SUN Jiao-Jiao,SHANG Qing-Mao*
(Key Laboratory of Biology and Genetic Improvement of Horticultural Crops,Institute of Vegetables and Flowers,Chinese
Academy of Agricultural Sciences,Beijing 100081,China )
In order to explore a high-efficient,simple and pollution-free mineral nutrient extraction
method for substrate seedlings,this paper took deionized water as extractant,studied the effects of 3 factors
including solid-liquid ratio (m:m),extraction temperature and oscillation time on 13 kinds of mineral
nutrient extraction efficiency.The results showed that the treatment combination with the highest NO3--N and
K extraction efficiency was solid-liquid ratio of 1:20,extraction temperature of 50 ℃,oscillation time of 5
hours,and the treatment combination with the highest extraction efficiency of NH4+-N,P,Ca,Mg,S,Fe,
Mn,Cu,Zn,Na and Cl was solid-liquid ratio of 1:20,extraction temperature of 50 ℃ and oscillation time
of 10 hours.This paper further established TOPSIS model;comprehensively judged the extraction efficiency
of 13 kinds of mineral nutrient;screened out the optimal treatment combination as solid-liquid ratio of 1∶20,
extraction temperature of 50 ℃,and an oscillation time of 10 hours.