Effects of Spraying Functional Substances on Growth and Nutrient Uptake of Sweet Potato Seedlings under Low Temperature Stress
Zhao Xiufen
Zhang Chenglong
Fang Zengguo
Dong Liangxin
Liu Qing
Li Junliang
Abstract：In order to explore the mitigation effects of functional substances(porcine blood amino acid polypeptide and earthworm lysate)on low temperature stress during culturing,Pushu 32 was used as experi-mental material,and the effects of foliar spraying of exogenous functional substances on the growth and nutri-ent absorption of sweet potato seedlings under low temperature stress were investigated and comprehensively e-valuated by greenhouse seedling experiment and principal component analysis.The results showed that foliar spraying of two kinds of functional substances could increase the plant height,dry matter ratio,100-plant weight and yield of seedlings,increase the SPAD value of leaves and phosphorus content of plants,and pro-mote the accumulation of phosphorus and potassium in sweet potato seedlings.Low temperature stress obviously decreased the seedling bed temperature,delayed the sweet potato emergence time,significantly decreased the seedling height with a decline of 10.3％to 17.5％.The stem diameter of sweet potato seedlings in no arch shed(C)treatment was obviously larger than that in other treatments.Low temperature stress obviously reduced the phosphorus and potassium absorption of potato seedlings.The dry matter ratio of sweet potato seedlings in treat-ment C was significantly higher than that in other treatments.The results of principal component analysis showed that six factors including 100-plant weight,yield of seedlings,plant height,potassium content,phosphorus ab-sorption and potassium absorption could be used as the indicators to characterize the growth,nutrient absorption and strong seedling quantity of sweet potato seedlings.The comprehensive score results showed that spraying functional substances could promote the growth and nutrient absorption of sweet potato seedlings.The effect of spraying porcine blood amino acid polypeptide was better than that of spraying earthworm lysate under the same seedling raising method,and the best effect was in the large and small arch shed superposition treatment.
Keywords：Low temperature stressSweet potato seedlingPorcine blood amino acid polypeptideEarthworm lysateGrowth and developmentNutrient uptake
Publication Date：2025-01-27
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 54-60 )