Application of polyamines to enhance the yield of sweet lemons in climatic conditions of Gilan province

Today, the biggest challenge that threatens domestic and foreign citrus markets is the rising cost of production and the low unit yield. Therefore, any agronomic techniques that reduce pre-harvest losses and increase production can increase production efficiency and productivity of soil and water resources. This study was conducted to investigate the effect of foliar application of different polyamines (putrescine, spermine, spermidine) on the yield properties of sweet lemon fruit in a completely randomized design with six treatments including spermine (0.25 and 0.5 mM), putrescine (0.1 And 0.25 mM), spermidine (1 and 1.5 mM) and control. The results showed that the best polyamine for use in sweet lemons is putrescine 0.1 mM. The results also showed a significant and positive effect of this treatment on preharvest fruit loss. The results of the study recommend sweet lemon growers use polyamines to enhance yield.