INTERPRETINGsummer EC readings

摘要

COVID-19 has changed the way I do extension and diagnostics. Visiting greenhouses is almost impossible, so the use of digital methods has increased. However, when somebody sends photos to me, the answer is often not a simple 'yes,' it is a deficiency,toxicity or other reasons.In this case study, the grower sent photos and mentioned leaf symptoms, which can be described as scorching, magnesium deficiency, mosaic, and puckering (see photo). The cluster set also had very weak, very pale flowers. Did you know that tomato plants produce three sets of leaves and one cluster per week? Under optimum light and temperature conditions, I have seen two leaves and one cluster as well. It all depends on plant energy balance. I asked the growerto send me information on feed and leach EC, the past week's day and night temperatures, any sprays, and any other facts relating to location. It was pointed out that symptoms are more prevalent on the south side compared to the north side of the greenhouse. After a few more emails, I finally received the data on pH, EC, light, average temperatures, sprays and any other foliar applications.