THE YIELDING ABILITY OF SEVERAL GREENHOUSE TOMATO CULTIVARS IN DEPENDENCE ON NUTRIENT SOLUTION CONCENTRATION AND FLOW AND ON PLANT DENSITY IN TRAY CONTAINER CULTIVATION

The nitrogen concentration in dry matter of the fifth leaf during growth of a greenhouse tomato crop was determined. Plants of hybrid Monte Carlo were grown in 4.5 L bags, using a commercial substrate, in a plant density of 3.3 plants m-2. A nutrient solution containing, in mmol L-1: KNO3, 4.0; K2SO4, 0.9; Ca(NO3)2, 3.75; KH2PO4, 1.5; MgSO4, 1.0; iron chelate 19. 10³, was used as reference. Microelements were added by a commercial mixture. The T3 treatment was equal to the reference nutrient solution, whereas in treatments T1, T2, T4 and T5 quantities of all nutrients from T3 were multiplied by 0.25, 0.50, 1.25 and 1.50, respectively. In each treatment, the volume of 1 L of nutrient solution was supplied to each plant once a week by fertigation. Periodically destructive measurements were made from anthesis to ripening of the first truss, to determine dry matter and N concentration in shoot and in fifth leaf tissues, counted from the apex to the bottom of the plant. Five dilution curves were fitted from data of N concentration in the fifth leaf and shoot dry matter accumulation during growth of plants. A general relationship was adjusted between actual N concentration in shoot (Nt) and in the fifth leaf (Nf): Nt = 1.287 Nf (R² = 0.80). This relationship could be used to estimate the N status of plants by means of a nitrogen nutrition index (NNI), from analysis of the fifth leaf sap.

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Effect of nutrient solution concentration and NH4:NO3 ratio on Maranta growth

Scientia Horticulturae ◽

10.1016/s0304-4238(98)00225-8 ◽

1999 ◽

Vol 80 (1-2) ◽

pp. 105-112 ◽

Cited By ~ 4

Author(s):

Z Strojny

Keyword(s):

Nutrient Solution ◽

Solution Concentration

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Inmobilización y retención nutrimental en aserrín de pino como sustrato agrícola.

REVISTA TERRA LATINOAMERICANA ◽

10.28940/terra.v37i3.448 ◽

2019 ◽

Vol 37 (3) ◽

pp. 261

Author(s):

Joel Pineda Pineda ◽

Felipe Sánchez del Castillo ◽

Esaú Del Carmen Moreno Pérez ◽

Luis Alonso Valdez Aguilar ◽

Ana María Castillo González ◽

...

Keyword(s):

Nutrient Solution ◽

Solution Concentration ◽

Particle Sizes ◽

Similar Concentration ◽

Volcanic Tuff ◽

Pine Sawdust ◽

Low Concentrations ◽

Growing Medium ◽

Leachate Water ◽

Main Substrate

Pine (Pinus sp.) sawdust has been used as a growing medium for the cultivation of vegetables and ornamentals. In the present work the objective was to assess the immobilization or retention of N, P, K, and Ca in pine sawdust as the main substrate component by applying Steiner nutrient solution at different concentrations (20, 30 and 40 meq L-1). We used uncomposted sawdust, alone or in mixtures (70/30, v/v) with volcanic tuff of different particle sizes (fine ≤ 3 mm, medium 3-6 mm, and coarse 6-12 mm). For two months, leachate was collected daily, and every 10 days, the average concentrations of N, P, K, and Ca, as well as pH and electrical conductivity (EC) were measured. The effect of the interaction substrate × nutrient solution concentration on N, P, K and Ca in the leached water was observed. These nutrients increased in concentration in the leachate water in accord with the nutrient solution concentration and as the diameter of volcanic tuff particles diminished. Irrigation with 20 meq L-1 (2 dS m-1) concentration of nutrient solution reduced the concentration of N, P, K, and Ca in leached water below its concentration in the supplied nutrient solution, while irrigation with 30 or 40 meq L-1 (2 or 4 dS m-1) resulted in similar concentration in leached water up to 20 or 30 dat, but at 40 dat, concentration of these nutrients in the leached water was higher. Immobilization of N and P, K, and Ca retention in the sawdust substrate occurred during the first 40 ddt, related to an increase in pH (up to 8.6), a decrease in EC (until 0.5 dS m-1) and low concentrations of N, P, K, and Ca in the leached water.

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