. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 128 MASS. EXPERIMENT STATION BULLETIN 176. No. 1. No. 2. No. 3. No. 4. No. 5. No. 6. No. 7. No. 8. No. 9. No. 10. No. 11. No. 12. No. 13. No. 14. No. 15. Standard nutrient solution. With calcium carbonate. With calcium sulfate. With 40 parts manganese per million of solution. With 40 parts manganese and calcium carbonate. With 40 parts manganese and calcium sulfate. With 100 parts manganese per million of solution. With 100 parts manganese and calcium carbonate. With 100 parts manganese and calcium sulfat
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. 128 MASS. EXPERIMENT STATION BULLETIN 176. No. 1. No. 2. No. 3. No. 4. No. 5. No. 6. No. 7. No. 8. No. 9. No. 10. No. 11. No. 12. No. 13. No. 14. No. 15. Standard nutrient solution. With calcium carbonate. With calcium sulfate. With 40 parts manganese per million of solution. With 40 parts manganese and calcium carbonate. With 40 parts manganese and calcium sulfate. With 100 parts manganese per million of solution. With 100 parts manganese and calcium carbonate. With 100 parts manganese and calcium sulfate. With 200 parts manganese per million of solution. With 200 parts manganese and calcium carbonate. With 200 parts manganese and calcium sulfate. With 300 parts manganese per million of solution. With 300 parts manganese and calcium carbonate. With 300 parts manganese and calcium sulfate. The experiment was conducted outdoors in the pot yard instead of in the greenhouse, the seedlings being put under cover at night and during inclement weather. The experiment was continued four weeks. The effect of the manganese was noticed after the first week. The seedlings with manganese did not grow as fast as the checks, and also began to show chlorosis of the leaves. The roots did not have a stunted appearance as was noticed when iron and alummium salts were used, but seemed to be simply underdeveloped. Neither the presence of calcium carbonate nor calcium sulfate had any beneficial effect. In some cases the calcium carbonate seemed to aggravate the rather than alle- viate it. When the experiment was discontinued the tops in the most concentrated manganese solutions had died and those in the most dilute had apparently lost all their chlorophyl. The tops and roots of the plants were dried and manganese determina- tions were made on them. The table shows the amounts of manganese found in 1 gram of oven-dried samples. Table VI. — Milligrams of Manganese Oxide {MrizO^ in 1 Gram o
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