Q.yellowing of indeterminate greenhouse tomatoes
Yellowing of indeterminate greenhouse tomatoes immediately after being lowered, irrigated hydroponically in cocopit media. We are using an indeterminate tomato variety FA593 and achieving very good results. At the Glen valley horticulture incubator in Gaborone, Botswana, we planted it in November 2011 in tunnels, greenhouses and net houses and the result was:
A very good crop stand. Tolerant to most pests and disease. Very good fruits, in size, number per truss and shape, but just before ripening, 80% of the fruit will started cracking. Water source we are using is treated sewage water. We use the ultra-filtration treatment plant, which does reverse osmosis in treatment, and we also dose nitric acid and sulphuric acid to lower the pH, which usually stands at 14, before treatment. Type of irrigation system: Hydroponics Growing media cocopit/coir in sausage bags. We are also experiencing yellowing of abellus variety immediately after lowering the plants, and during this stage it aborts flowers and will improve after 3 weeks or so.
Please advise. Thank you,
Bettie Francis Technology coach Glenvalley incubator