Selecting optimal application rate of water-soluble fertilizer for green-house white radish based on the comprehensive evaluation method of KP-CA dimensionality reduction

WEI Yurong; MA Yingjie; AI Pengrui

doi:10.16861/j.cnki.zggc.2024.0348

Abstract：In order to thoroughly investigate the optimal application scheme of water-soluble fertilizer for greenhouse white radish in Urumqi,four treatments with different concentration gradients of water-soluble fertilizer were set up to explore the effects of water-soluble fertilizer on the growth,yield and fruit quality of greenhouse radish.A comprehensive evaluation system of membership function based on kernel principal component analysis(KPCA)dimensionality reduction was constructed.The results showed that high concentrations of nitrogen-phosphorus-potassium water-soluble fertilizer were beneficial for increasing yield.Low levels of water-soluble fertilizer were beneficial for increasing the content of vitamin C and soluble sugar.Medium-level water-soluble fertilizer promoted fruit mass per plant.Furthermore,there was a significant positive correlation between the concentration of water-soluble fertilizer and dry matter mass,plant height and soluble sugar content,leaf number and length,as well as yield and benefit ratio per 667 m2.In contrast,significant negative correlations were found beteen plant height and fruit mass,vitamin C content and SPAD value,as well as fruit mass and soluble sugar content.These results revealed certain correlations and mutual constraints between agronomic traits and quality of white radish.A multi-index comprehensive evaluation system based on KPCA dimensionality reduc-tion technology was used to process 12 evaluation indexes,and three principal components were obtained.These three principal components were comprehensively evaluated using the membership function,and the correlations of 12 indexes as well as the accumulation pattern of above-ground dry matter were analyzed.Aiming to increase yield and improve qual-ity,the optimal water and fertilizer treatment scheme was identified as M2 treatment(High phosphorus type 105 kg·hm-2,Rooting type 785 kg·hm-2,Agricultural microbial agents 75 kg·hm-2,Rhizome-specific type 105 kg·hm-2).