การขาดธาตุอาหารในหงส์เหิน

บทคัดย่อ

Effects of mineral nutrient deficiencies on growth development and deficiency symptom were studied in globba. Plants were grown in sand which supplied with 6 treatments of different nutrient solutions. Treatment 1: the solution consisted of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and trace elements, treatment 2 – 5: the solution lacked of N, P, K or Ca, respectively and treatment 6: plants were fed with nutrient free solution (water). The data was collected in every 2 weeks. The results showed that the visible symptom in -N treatments: leaf was small, yellowish green and gradually turns in to yellow. Shoot growth was retarded, roots had few ramification and average height was 20.85 cm. The pink bract was pale, the number of racemes/ cluster was 1.62 racemes and no floret. In P-deficient symptom, the mature leaf was dark green, plant height was 27.59 cm, floral bract was pale as same as to show in-N treatment, the number of racemes/cluster was 2.88 racemes. In -K treatment, it was also found that flower bract was pale, leaf was small and the number of racemes/cluster were 3.38 racemes. The Ca-deficient roots were brown and the raceme did not show deficiency symptom in this treatment.