The relation of organic matter and fertilizer to the growth and composition of rice
1937
Sturgis, M.B. | Reed, J.F.
A study was made of the relation of additions of nitrogenous organic matter, fertilizer salts, lime, and sulfur to the yield, protein, and ash constituents of rice grown in Crowley soils. The addition of nitrogen to a deflocculated Crowley silt loam increased the percentage of protein in the rice heads and the yield of rice grown on the soil. A relatively large amount of nitrogen in a virgin Crowley soil was found to be associated with a high protein content in the rice. The application of phosphorus to a soil deficient in this nutrient resulted in a greater yield of rice and a higher phosphorus content on the percentage basis. The comparatively higher amount of phosphorus in a virgin Crowley silt loam was reflected by a higher yield of rice and a high percentage of phosphorus in the rice heads. The use of potassium salts as a fertilizer seemed to balance the effects of excess amounts of lime-and sulfur in their tendencies to cause the development of a low ratio of grain to straw. The indications are that the absorption and translocation of phosphorus by the rice plant were not necessarily dependent upon the absorption and movement of magnesium. Rice grown on alkaline soil which contained large amounts of soluble and colloidal silica absorbed unusually large amounts of silica. The silica content of the straw was much higher than that of the heads. Silicon was not substituted for phosphorus as a nutrient in the growth of rice. The iron content of both heads and straw was found to be high in all cases observed. The soil solution of the flooded soil was high in soluble iron which existed largely in the ferrous state.
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