ISHS Acta Horticulturae 440: International Symposium on Plant Production in Closed Ecosystems
EFFECTS OF DIURNAL CONTROL IN THE MINERAL CONCENTRATION OF NUTRIENT SOLUTION ON TOMATO YIELD AND NUTRIENT ABSORPTION IN HYDROPONICS |
| Authors: | T. Higashide, H. Shimaji, M. Takaichi |
| Keywords: | diurnal control, hydroponics, mineral absorption, mineral concentration, tomato, yield |
| Abstract:
We researched effects of diurnal change of the mineral concentration on tomato yield and nutrient absorption. First, we examined the effect on yield in a spray culture. In the experiment 1–1, when nitrate concentration of solution (N) and potassium concentration (K) were low and phosphate concentration (P) was high during the daytime, while N and K were high and P was low during the night, the yield was low. In the experiment 1–2, when N and K were high and P was low during the daytime, while N and K were low and P was high during the night, the yield was low. Second, we examined the effect on nutrient absorption in a water culture. Concentration of KNO3 of solution was changed in the daytime or the night. When KNO3 level was low during the daytime, while it was high during the night, total nitrate and potassium absorption for 24 hours was the highest. It were showed the possibility of the efficient supply of minerals to plants by the diurnal control in minerals. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
