Synopsis Nitrate accumulation occurred in stalks or stems of corn, sorghum, and soybean plants. Legumes in the rotation or applications of manure or nitrogen fertilizer increased the nitrate content of the plants. The amount of nitrate in plants depended upon the stage of maturity, the degree of drouth injury, and the availability of nitrogen in the soil. Nitrate content was reduced but not destroyed by ensiling corn plants.

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Synopsis The weight of young corn plants in soil cultures in the greenhouse was found to increase with the content of phosphorus present naturally in the seed independently of seed weight. In field experiments, supplementation of the natural phosphorus content of each seed with 6 mg. of P as NaH2PO4·H2O applied in a glue coating resulted in an average corn yield 4.5 bu. per acre above that produced from seed treated with glue alone.

Sypnosis Several different methods of evaluating the relative effects of soil type differences on crop yields obtained in a long time rotation‐fertility experiment at the Agronomy Farm, Ames, Iowa, are presented. All methods of analysis used indicate that yield differences are associated with soil type differences. The relative productivity of the different soils was found to be dependent upon the crop and management system under consideration.

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