ISHS Acta Horticulturae 635: XXVI International Horticultural Congress: Managing Soil-Borne Pathogens: A Sound Rhizosphere to Improve Productivity in Intensive Horticultural Systems
SOME AGRONOMIC AND PATHOLOGICAL CRITERIA AFFECTING TOMATO YIELD IN THE BLACK-SEA REGION OF TURKEY |
| Author: | A. Apaydin |
| Keywords: | tomato yield, Phytophthora infestans, plant density |
| Abstract:
As a result of the plant density experiments, the relationship between yield and plant density were described as Y = -9E - 05X2 + 1.1747X + 4882.8 (R2 = 0.66) for tomato cultivar ‘SC2121’, as Y = -0.0002X2 + 1.6202X + 4548.7 (R2 = 0.79) for tomato cultivar ‘H2274’, and as Y = -0.0001X2 + 1.4658X + 4632.4 (R2 = 0.74) for both cultivars. It was concluded that 2500 plants per decare (1000 m2) was the best plant density for the highest yield. According to mulching studies on the tomato cultivar ‘SC2121’, the most economical treatment was to plant the tomatoes on the 15th of April combined with black polyethylene mulch, and without covering with small plastic tunnels. This treatment increased total and early yield respectively 1.4 and 22.6 fold as compared with the conventional growing system. An early and severe outbreak of late blight, caused by Phytophthora infestans (Mont.) de Bary, did not affect yield during the first and second harvest period immediately after the epidemic started, but important yield losses were observed during the following harvests. Nevertheless, it was concluded that it was not necessary to apply chemicals, even if epidemic conditions were favorable, after the third week of August. The equation Y = 7084 - 5184r (R2 = 0.77) for the period in which epidemic started between the last week of August and mid-September and the equation Y = 6947 - 15046r (R2 = 0.95) for the other growing periods were established between apparent infection rate (r) and yield loss (Y). | |
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