The effect of various sapropel concentrations on content and fluorescence of photosynthetic pigments of bean

Irena Januškaitienė,Martynas Klepeckas

doi:10.5755/j01.erem.72.4.16585

Abstract

Tarosiskio lake sapropel impact on beans (Vicia faba L.) photosynthesis parameters (content of chlorophylls and chlorophyll a fluorescence) was investigated in this study. Plants were sown in 1 L volume pots by 5 seeds with light loamy soil and grown in growth chambers. Considering sapropel composition, 2.2; 3.1 and 4 t/ha dry sapropel concentrations were chosen for investigation. Sapropel affected plants were compared with plants grown in unfertilised and with synthetic fertiliser fertilised soils. On 14th day of experiment, when the plants reached two leaves growths stage (BBCH 12), chlorophyll a fluorescence parameters of investigated plants were measured. Then plants were grown for 4 weeks more and at stem elongation stage (BBCH 31) chlorophyll a fluorescence parameters were measured repeatedly and also the content of chlorophylls and carotenoids were investigated. The efficiency II photosystem of bean increased by increasing sapropel concentration in soil, but insignificantly (p>0.05). Photosynthesis performance index was increasing (r=0.91; p 0.05). At BBCH 12 stage the highest non photochemical quenching (NPQ) value was measured in control beans, while at BBCH 31 stage, opposite trend was noticed (r=0.86; p 0.05), and the changes in carotenoid contents were similar to chlorophyll a+b.DOI: http://dx.doi.org/10.5755/j01.erem.72.4.16585

Highlights

The use of mineral fertilisers is among key factors driving the increased global agricultural production required to feed the rising human population
Mn is involved in photolysis reactions; in case of its shortage, photosynthesis is disrupted and visual symptoms appear on leaves, and plant dry mass and yield decreases
Our findings show that photosystem II efficiency of V. faba increased with increasing sapropel concentration in the soil; the increase was insignificant (r = 0.94; p > 0.05) (Figure 1)

Summary

Introduction

The use of mineral fertilisers is among key factors driving the increased global agricultural production required to feed the rising human population. The use of inorganic fertilisers has recently become more of a problem than benefit, because often it is related to soil acidity, its quality lowering, nutrient misbalance and lowered yield quality (UN, 2011). Environmental and economic concerns have prompted agricultural producers and researchers to look for improved nutrient management strategies (Sokolov et al, 2008). Organic matter concentration in soil is one of the most important components. A strong correlation was found between soil organic matter amount and organic matter amount which is returned to soil when plants are decomposing (Trapani et al, 1999, Sokolov et al, 2008)

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Results

Conclusion