Effect of different soluble potassium fertilizers on yield, yield components and quality properties of different tomato cultivars irrigated by a drip system

Kılıç C. C. , Duyar H.

Acta Horticulturae- ISHS Symposia Proceedings, no.1253, ss.133-140, 2019 (Düzenli olarak gerçekleştirilen hakemli kongrenin bildiri kitabı)


Tomato (Solanum lycopersicum) is one of the main crops grown in Turkey for fresh consumption and for paste industry. The objective of this study was to examine the single and combined effects of some soluble potassium (K) fertilizers as nitrate of potash (NOP), sulfate of potash (SOP) and their combination (NOP+SOP) on marketable yield, yield components, some quality properties of a greenhouse tomato for table and a field cultivar for paste industry which were irrigated by a drip system. Results in relation to paste tomato showed that the highest yield was obtained from the SOP treatment. The highest EC, titratable acidity (TA), firmness, total soluble solids (brix), fruit width, height and weight (FW, FH, FW1) were found high in the NOP+SOP treatment. It is important to highlight that SOP receiving tomatoes are found high in their leaf K contents and NOP for many of the micro elements of the leaves. Table tomato results indicated that fertilizers applied by fertigation significantly affected the fruit yield, the highest being in the NOP+SOP treatment parcels. Firmness and TA were found high in the NOP+SOP treatment but the highest EC and brix in the SOP treatment. Likewise, the paste tomato, the leaf K and some of the micro elements in the leaves of table tomatoes are relatively high in the SOP treatment. It can be concluded that yield is important for both of the cultivar but brix yield obtained from per unit area is as well important. Marketable yield with attractive and tasteful fruits in the case of table cultivars are significant and needed to be highlighted. In this regard, economic analysis between SOP and NOP+SOP fertilization should be made before deciding on a recommendation. Most significant of all, nutritional status of tomato plants should be studied via their leaves at the recommended sampling time.