Effects of Different Substrate Ratios on the Physiological Metabolism,Yield and Quality of Cucumbers in Gobi Greenhouses
The substrate is the foundation of cucumber growth and has a significant impact on its yield and quality.In order to obtain the optimal substrate ratio for high-quality cucumber production in organic ecological soilless cultivation in Gobi greenhouses,this experiment used the commonly used substrate ratio in production as a control to study effects of 5 different substrate formulations on cucumber leaf chlorophyll fluorescence parameters,yield and quality.Through comparative analysis of cucumber growth physiology and yield and quality indicators under different treatments.The results showed that using the substrate formula of treatment IV(decomposed cow manure,crushed corn straw,bacterial residue,peat,vermiculite at 3∶2∶1∶2∶1),the maximum quantum yield(Fv/Fm)and growth potential activity(Fv/Fo)of cucumber leaves were the highest,with values of 0.76 and 3.18,respectively.Plant height,stem diameter,number of leaves,number of fruits per plant,yield per plant,and yield peaked,with values of 196.15 cm,0.92 cm,38.31 leaves,17.65 pieces,3.58 kg,and 155 508.90 kg/ha,respectively,which werehigher than other treatments.The fruits treated with this method had the highest contents of Vc and soluble sugars,which were 167.28 mg·g-1 and 19.83 mg/g FW,respectively,the lowest nitrate content at 78.94 μg/g FW.From this,it can be seen that the matrix formula of decomposed cow manure,crushed corn straw,bacterial residue,peat,vermiculite at 3∶2∶2∶2∶1 has the best comprehensive performance,and the cucumber yield and quality are the best.
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