SOIL ALKALINITY. II THE EFFECTS OF Na2CO3 ON IRON AND MANGANESE SUPPLY TO TOMATOES |
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| Authors: | A S MASHHADY D L ROWELL |
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| Institution: | (Soil Science Department, The University, Reading) |
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| Abstract: | Sodium carbonate added to nutrient solution in sand culture depressed the growth of tomatoes both by the influence of high pH and HCO3? causing chlorosis and by the effect of Na+. Foliar sprays of iron and manganese removed chlorosis and increased growth but did not remove the effect of Na. In a sandy soil Na2CO3 did not cause chlorosis but Na+ depressed yield. Chelated Fe and Mn in the soil solutions (up to 7.3 × 10?4 M Fe and 2.6 × 10?5 M Mn at pH 9.0) were sufficient to supply the crop needs as shown by a second sand culture experiment where plants were fed with nutrient solution plus extracted soil solution. |
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