Effects Of Seaweed Extract On The Growth And Stress Resistance Of Three Economic Crops

Seaweed is a primary producer in the ocean.It has the characteristics of simple structure,large biomass,fast growth,strong material exchange and enrichment,and abundant metabolites.Because it survives in the marine environment,algae are rich in unique active substances that are lacking in many terrestrial plants.Seaweed extract has the function of promoting plant growth,improving stress resistance and improving soil environment.At the moment when environmental health and human health appeals are becoming more and more intense,the study of seaweed extracts has important research and application value in the application of chemical fertilizers to increase efficiency,reduce crop yield,and improve stress resistance.In this study,seaweed extract was used as material to study the effects of seaweed extract on crop yield and quality through field experiment of cherry and rice.The effects of seaweed extract on the stress resistance of tea tree were studied by hydroponic experiment of tea seedlings.This paper can provide ideas and references based on the development and application of fertilizers for seaweed extracts.The main findings are as follows:?1?Seaweed extract can promote plant growth and quality:In the spring of 2017and 2018,a field experiment was carried out in Yantai,Shandong Province.The foliar application of different concentrations of seaweed extracts on the growth and fruit quality of sweet cherry?Prunus avium?plants was studied.Impact,indicators of growth and nutrient composition of the fruit were tested.The growth and quality of cherries have an increasing trend.The experiments on the roots of hydroponic tea trees by non-invasive micro-measurement technology show that brown algae oligosaccharides can significantly affect the proton efflux of tea trees and reduce the absorption of NH₄⁺under hydroponic conditions.Promote K⁺absorption in tea roots.?2?Seaweed extract can promote crop yield.After ripening of rice,it was found that the application of seaweed blended fertilizer increased yield by 18.47%compared with the application of conventional blended fertilizer;the treatment group with 20%seaweed blended fertilizer increased yield by 15.6%.Compared with the control group,the yield components?effective panicle number,grain per panicle,seed setting rate?were significantly improved,up by 16.13%,9.42%,and 17.6%,respectively.?3?The seaweed extract can improve the fertilizer utilization effect:the treatment group which measures the application of seaweed blending fertilizer and reduces the application of 20%seaweed blending fertilizer has a significant effect on the nitrogen element in the conventional blended fertilizer wheat ear,It increased by 12.96%and11.1%respectively;the fertilizer utilization productivity index was used to verify the fertilizer utilization analysis.The experimental group with seaweed blended fertilizer and reduced application of 20%seaweed blended fertilizer had the best effect.The results showed that the treatment group with reduced application of 20%seaweed blended fertilizer had higher partial productivity than the fertilizer with conventional blended fertilizer.At 155.98%,the partial productivity of phosphorus and potassium fertilizers increased by 44.52%.?4?Seaweed extract can improve the stress resistance of the crop.In the 2018experiment,the cherry experiment was set up for repeated verification according to the results of the 2017 experiment.Although the test orchard was reduced due to weather,the seaweed extract treatment group still showed a tendency to improve cherry growth and fruit quality.It is speculated that the seaweed extract has a certain anti-reverse effect.The non-damage micro-test technique was used to detect the ion flux in the roots of hydroponic tea trees,and the mechanism of the resistance of algae oligosaccharides to the roots of tea trees was investigated.