. Experimental conditions and design
Soil characteristics (0–30 cm layer; prior tomato transplanting):
pH 7.3; EC 0.90 mS cm
−1
; NO3
−
55.0 mg dm
3
; P 2.8 mg dm
3
; K
64.8 mg dm
3
; Ca 154.8 mg dm
3
; Mg 75.0 mg dm
3
, determined in
water extract 1:2 (Sonneveld, 1990), 0.25% total nitrogen (Kjeldahl)
and 10.3% organic matter content (dry combustion at 550
◦
C).
The greenhouse air temperatures varied between 10.6–17.9
◦
C
during the nights and reached 31.8–38.4
◦
C during the days. The
relative humidity was usually 30–70% during the day and 50–80%
during the nights, and solar radiation varied between 100 and
250 W m−2
.
Tomato seeds were sown on 19–23 of January (days varied
depending on the year) in foamed polystyrene plug trays with 198
inverted pyramid cells, filled with peat moss and perlite in the ratio
1:1 (v/v). One seed per cell was sown. At the stage of first true leaves
(on 1–8 of March) the plants were pricked out in plastic pots, containing 0.5 L of mixture peat moss and perlite in the ratio 1:1 (v/v).
On 4–5 of April plants were transplanted in soil supplemented with
mineral fertilizers in amounts determined in accordance with the
recommendations following the analysis. Fertilizers were applied
as base dressing (triple superphosphate and potassium sulfate) and
post-planting fertigation (ammonium nitrate, potassium nitrate,
monopotassium phosphate). Nutrients were supplied in the following rates: N 300 kg ha
−1
; P2O5260 kg ha
−1
and K2O 500 kg ha
−1
.
Harvesting period began on 3–7 of June and ended on 22–24 of
July. Plant density was 3.5 plants per m2
. Tomato plants were
trained at wires and pruned to a single stem by removing al
. . Experimental conditions and design
Soil characteristics (0–30 cm layer; prior tomato transplanting):
pH 7.3; EC 0.90 mS cm
−1
; NO3
−
55.0 mg dm
3
; P 2.8 mg dm
3
; K
64.8 mg dm
3
; Ca 154.8 mg dm
3
; Mg 75.0 mg dm
3
, determined in
water extract 1:2 (Sonneveld, 1990), 0.25% total nitrogen (Kjeldahl)
and 10.3% organic matter content (dry combustion at 550
◦
C).
The greenhouse air temperatures varied between 10.6–17.9
◦
C
during the nights and reached 31.8–38.4
◦
C during the days. The
relative humidity was usually 30–70% during the day and 50–80%
during the nights, and solar radiation varied between 100 and
250 W m−2
.
Tomato seeds were sown on 19–23 of January (days varied
depending on the year) in foamed polystyrene plug trays with 198
inverted pyramid cells, filled with peat moss and perlite in the ratio
1:1 (v/v). One seed per cell was sown. At the stage of first true leaves
(on 1–8 of March) the plants were pricked out in plastic pots, containing 0.5 L of mixture peat moss and perlite in the ratio 1:1 (v/v).
On 4–5 of April plants were transplanted in soil supplemented with
mineral fertilizers in amounts determined in accordance with the
recommendations following the analysis. Fertilizers were applied
as base dressing (triple superphosphate and potassium sulfate) and
post-planting fertigation (ammonium nitrate, potassium nitrate,
monopotassium phosphate). Nutrients were supplied in the following rates: N 300 kg ha
−1
; P2O5260 kg ha
−1
and K2O 500 kg ha
−1
.
Harvesting period began on 3–7 of June and ended on 22–24 of
July. Plant density was 3.5 plants per m2
. Tomato plants were
trained at wires and pruned to a single stem by removing al
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