Growth of leaf vegetables cultured in simplified equipment of hydroponics.
1994
Matsui N.
To simplify equipments of hydroponics for comparatively rapid growth of leaf vegetables, the growth of shanghai pak-choi (Brassica campestris, chinensis group) was compared in three different application systems of nutrient solution; flow (F), and non-flow without further supplement (N) or with supplement of nutrient solution at abut 10 days-interval (N=S) system. The following observations were made: 1) Plants cultured in N system were inferior in growth to those in F system. 2) Top growth of plants cultured in N-S system was almost similar to that in F system. 3) Root growth in N-S system was decreased by 50% in length, but increased by 20% in fresh weight as compared with those in F system. 4) Oxygen content and electronic conductivity in the solution were remarkably low since the middle of growth period in N=S system. 5) Water use per plant was 1370 ml in total for a whole period and daily use was maximized in the middle of growth period. 6) The solution temperature in N=S system was generally 2-3 degrees C higher than in F system.
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