Toxidez do alumínio em plantulas de cacau
The effect of increasing levels of aluminium on the growth of cocoa seedlings was measured in four greenhouse trials. In two experiments the roots of the cocoa seedlings were subdivided, one half being immersed in a Hoagland nutrient solution and the other in aluminium sulphate solutions. This was to avoid interactions between the phosphorus and the aluminium. In one of these trials the aluminium levels were from 0 - 8 ppm and in the other 0 - 21 ppm. Results showed that root growth was reduced at the 32 ppm level. In the third experiment the seedlings were cultivated in a Hoagland nutrient solution to which had been added varying quantities of aluminium sulphate (0 - 256 ppm Al.). A week after the start of the experiment the seedlings in the 128 and 256 ppm treatments had died. In the fourth trial the seedlings were cultivated in a Hoagland solution for 35 days, transferred to different aluminium sulphate solutions (0 - 128 ppm Al.) and cultivated for a further 30 days. The cocoa seedlings supported aluminium levels up to 16 ppm above which growth was stunted with death occurring at the higher dosages
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1973
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| Subjects: | THEOBROMA CACAO, PLANTULAS, ALUMINIO, FITOTOXICIDAD, ETAPAS DE DESARROLLO DE LA PLANTA, |
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