ISHS Acta Horticulturae 401: International Symposium on Growing Media & Plant Nutrition in Horticulture
EFFECT OF NH4-N LEVEL IN THE NUTRIENT SOLUTION ON THE INCIDENCE OF BLOSSOM-END ROT AND GOLD SPECKS ON TOMATO FRUIT GROWN IN ROCKWOOL |
| Authors: | A. Nukaya, K. Goto, H. Jang, A. Kano, K. Ohkawa |
| Keywords: | Blossom-end rot (BER), Gold specks, Tomato (Lycopersicon esculentum Mill.), Rock wool, Ca uptake, NH4-N |
| Abstract:
Tomatoes, cvs. ‘Momotaro’ and ‘June pink’, were grown with a free drainage rockwool system for 88 and 99 days, respectively, after transplanting in order to clarify the effect of NH4-N concentrations (0, 0.7, 1.3 and 2.0 me/l) in the nutrient solution on Ca uptake, and on the incidence of blossom-end rot (BER) and gold specks on fruits. The incidence of BER became higher and of gold specks lower with increasing NH4-N concentrations in nutrient solution. The incidence of BER and gold speck were inversely related. However, this relationship was only observed within the same cultivar. The percentage of fruit with both BER and gold specks was higher at ‘June pink’ than at ‘Momotaro’. The cumulative Ca uptake tended to decrease with increasing NH4-N concentrations in the nutrient solution in both cultivars. Higher gold speck incidence seemed to be correlated with a higher Ca uptake by the plants. | |
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