Effect of nutrient solution composition, number of fruits and leaf area on growth and yield of tomato under CO2 enrichment in long-term forcing cultivation
2018
Ito, M. | Ban, Y. | Tsunekawa, Y.
We investigated the effect of nutrient solution composition, number of fruits, and leaf area on the growth and yield of tomato under CO2 enrichment with the aim of increasing yield in long-term forced cultivation. 1. Tomato leaf area index (LAI) increased and growth became vigorous by increasing the phosphorus and potassium concentrations and reducing the ammonia nitrogen ratio compared with the Enshi formula nutrient solution. In addition, the occurrence of blossom end rot was reduced and the fruit yield was increased. 2. There was no difference in yield by increasing the number of fruits during the CO2 enrichment period. It was considered that the lack of photosynthate in relation to the number of fruits was due to the low LAI during the treatment period. 3. When cultivating a leaf area index (LAI) between 4.9 to 5.5 in the winter season (mid-December to mid-February), the yield tended to increase in the period from January to April, and the sugar content also increased compared with an LAI range of 3.3 to 3.7. Under improved cultivation conditions (CO2 enrichment, improvement of light-intercepting characteristics) an LAI of more than 4 is considered to be suitable during the winter season.
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