Effect of fertilizers on the yield of rice grown in pots
1933
Jones, J.W.
All plants grown in fertilized soil were slightly taller than the check plants, except those grown in soil fertilized with potassium nitrate and potassium sulfate. The average increase in the height of plants grown in soil fertilized with bur clover and a complete fertilizer, respectively, appears to be significant, whereas the other increases and decreases in height are probably not significant. All plants grown in fertilized soil produced more culms than did the check plants, except those grown in soil fertilized with potassium nitrate and potassium sulfate. The average increase in number of culms ranged from 1% in plants grown in soil fertilized with dried blood to 27.3% in plants grown in soil fertilized with bur clover. What appear to be significant increases in grain yields were obtained from a combination of ammonium sulfate and superphosphate, a complete fertilizer, and bur clover. The average increases in the order given were 11.9, 13.1, and 25.3%, respectively. The plants in all treatments, including the check, produced slightly more straw than grain, except those grown in soil fertilized with potassium nitrate and potassium sulfate. The ratios of grain to straw varied from 1:0.94 in plants grown in soil fertilized with potassium nitrate to 1:1.15 in plants grown in soil fertilized with cottonseed meal. None of the plants grown in fertilized soil produced seed significantly heavier than that of the check plants. The application of bur clover resulted in the largest yields of rice, whereas superphosphate, potassium sulfate, and potassium nitrate applied alone had no appreciable effect upon yield.
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