Effects of Concentration of Nutrient Solution and Potting Media on Growth and Chemical Composition of a <i>Phalaenopsis</i> Hybrid

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  • ファレノプシスの生長と化学組成に及ぼす培養液濃度と培養土の影響
  • ファレノプシス ノ セイチョウ ト カガク ソセイ ニ オヨボス バイヨウエキ
  • Effects of Concentration of Nutrient Solution and Potting Media on Growth and Chemical Composition of a Phalaenopsis Hybrid

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Abstract

Effects of 4 levels of nutrient solution and 6 potting media on growth and chemical composition of plant parts of a Phalaenopsis hybrid, ‘(Dtps. Red Lip×Phal. Red Eye)×Phal. Culmination’ were examined.<br>1. Phalaenopsis plants potted in Bora(pumice)+peat moss(3:1, v/v)mix were given 4 levels of nutrient solution. N, P, K, Ca and Mg concentrations in standard nutrient solution (St solution) were prepared at 231, 46.5, 117.3, 80.1 and 12.2ppm, respectively. Every solution was supplied with microelements at the same concentration. Plants grown with St solution showed better growth and flowering than those grown with 1/3 and 2/3 St solution. Plants grown with 4/3 St solution showed the best growth, but flowered later than the plants grown with St solution. N and K contents in the leaves increased with increasing levels of nutrient solution whereas Ca and Mg contents decreased.<br>2. Phalaenopsis plants were potted in potting media and grown with 1/3 St solution. Six potting media were as follows: Bora+peat moss(3:1) mix, Bora+peat moss (2:1) mix, Bora+peat moss(1:1) mix, hemlock bark (well-decomposed), redwood bark (raw material) and sphagnum moss. Plants grown in sphagnum moss showed good growth. N, P, K, Ca and Mg contents (% dry weight) of leaves were 1.74, 0.18, 4.42, 1.13 and 0.48, respectively. Mg content appeared to be low. Plants grown in Bora+peat moss (1:1) mix were superior in growth and flowering to those in sphagnum moss. N, P, K, Ca and Mg contents (% dry weight) of leaves were 1.36, 0.18, 2.20, 1.34 and 1.75, respectively. Plants grown in Bora+peat moss (3:1) mix and Bora+peat moss(2:1) mix were inferior in growth to those grown in Bora+peat moss(1:1) mix. Plants grown in hemlock bark were superior in leaf growth and inferior in root growth to those grown in other potting media, and flowering of these plants was delayed. N, P, K, Ca and Mg contents (% dry weight) of leaves were 2.93, 0.24, 4.49, 0.50 and 0.32, respectively. N and K contents of these plants were high, while Ca and Mg contents were low. Plants grown in redwood bark were of lowest quality. Ca and Mg contents of leaves of these plants were also low.

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