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- W1983679324 abstract "Nodulating and nonnodulating soybean isolines field-tested for 7 years produced essentially equal N yields when adequate combined N was available. The amount of N fixed symbiotically depended largely upon the availability of soil N, water, or both, and ranged from 1 to 142 pounds per acre, that is, 1 to 74% of the total N uptake, respectively. The amount of symbiotic N fixation decreased rapidly with increases in fertilizer N. Nodule weight, number, and size were directly related to increased N fixation and inversely related to increased increments of applied N. The correlation of symbiotic N fixation with nodule mass was r = 0.9. Except for a severe moisture stress, the nonnodulating line responded linearly to applied N, with 3.2 pounds of fertilizer N equivalent to 1 pound of plant N. Short-term rotation studies indicated that, when no fertilizer N was used, the residual effect of a nodulated soybean crop in the previous year was 33 pounds of N per acre." @default.
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- W1983679324 date "1966-01-01" @default.
- W1983679324 modified "2023-09-30" @default.
- W1983679324 title "Nodulating and Nonnodulating Soybean Isolines: II. Response to Applied Nitrogen and Modified Soil Conditions <sup>1</sup>" @default.
- W1983679324 doi "https://doi.org/10.2134/agronj1966.00021962005800010015x" @default.
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