As previously noted, water management is extremely important in tomatoes for both total and marketable yield. In addition, water quality is impotant. In many areas of the world, salinity reduces production. Although tomatoes are more salt-tolerant than many other crops, fruit weight is generally reduced by salinity. Nevertheless, saline water up to 7 decisieme (ds) m-1 is used for irrigation in Israel, both because of the scarcity of fresh water for agriculture and because of the effect of salinity in improving soluble solids and other quality components in tomatoes. In addition to factors which limit vegetative growth, tomatoes can also be said to be limited by their own fruitfulness. As discussed in the sections on vegetative growth and development of the reproductive structure to anthesis high temperatures, high nitrogen and low light, especially in combination, encourage vegetative growth more than reproductive growth. In these conditions the plant may grow well, but be late-yielding or low yielding because vegetative growth is favoured over reproductive growth. Poor pollination leading to flower abscission, as discussed in the section on physiological disorders, is a frequent contributor to yield and quality problems in tomatoes. Market dwmand for large, unblemished fruit also means that fruit suffering from any of a number of defects of the type described under Physiological disorders or damaged by insects will be unsaleable. Even 'cosmetic will lower prices of fresh market tomatoes.