Several instances of vegetables on which nutrient deficiency arose in their fields were collected for investigation.
The information obtained from these instances are found to be useful for nutritional diagnosis of plant and soil testing.
The results were as follows.
1) Phosphorus deficiency of spinach; P concentration in phosphorus deficient leaves was low enough to be 0.15%. The soil on which the phosphorus deficient spinach was grown was acidic (pH 4.6), but the soil had available P
2O
5 of 22 mg/100 g.
2) Potassium deficiency of eggplant; K concentration in potassium deficient leaves was low ranging from 0.55 to 1.62%. Contents of exchangeable K
2O in soil on which deficient eggplant was grown was low to be 7 mg/100 g.
3) Magnesium deficiency of eggplant and Japanese radish; Mg concentration in magnesium deficient leaves were on the level of 0.03, 0.06% respectively. The exchangeable MgO in the soil was low to be 14 mg/ 100g.
4) Iron deficiency of tomato; Fe concentration in new leaves was 70 ppm and the soil on which tomato was grown was alkaline (pH 8.1) .
5) Manganese deficiency of garland chrysanthemum, spinach and eggplant; Mn concentrations in the leaves were 18, 8 and 13 ppm respectively. The soils on which garland chrysanthemum and spinach were grown showed pH of more than 8.4. In the case of eggplant, the soil showed pH of 7.0 to 7.3, and the exchangeable Mn and the readily reducible Mn in the soil were low to be 0.6, and 19 to 27 ppm respectively.
6) Boron deficiency of celery, tomato and garland chrysanthemum; The concentrations of B in leaves were 17, 18 (upper leaves) to 41 (lower leaves) and 16 ppm respectively. The stem of celery had 15 ppm of B.
The nutrient-deficiency test were carried out by the use of water culture method to confirm the reproducibility of nutrient deficiency. The deficiency symptom revealed in this test was nicely consistent with the above results in the fields (1-6),
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