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Brown checking of celery, a symptom of boron deficiency. III. Effects of potassium, nitrogen, and boron in nutrient culture solutions on the physiological disorder and nutrient uptake



Brown checking of celery, a symptom of boron deficiency. III. Effects of potassium, nitrogen, and boron in nutrient culture solutions on the physiological disorder and nutrient uptake



Proc Amer Soc Hort Sci 71: 455-467



Celery plants (Apium graveolens L. var. dulce Pers.) were grown in nutrient (Hoagland's) sand culture to observe the relationship of boron, nitrogen, potassium and calcium to the physiological disorder of brown checking and cracked stem. The degree of brown checking and cracked stem was significantly increased by lowering the B concentration (0.10 and 0.25 ppm) and/or by raising the K concentration (500 and 1000 ppm) in the nutrient solution. The effect due to N (500 ppm) was significant early during the growth. Increasing the Ca concentration (240 ppm) apparently had little or no effect on the disorder. Foliar sprays of 1.5% boric acid prevented symptoms of brown checking and cracked stem on plants grown in low B (0.05 ppm). Chemical analyses for N, P, K, Na, Ca, Mg, and B were made.

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