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This article in AJ

  1. Vol. 62 No. 6, p. 802-803
    Received: Apr 30, 1970

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Influence of “Pop-up” Fertilizers on Soybean Stands and Yield1

  1. J. G. Clapp Jr. and
  2. H. G. Small Jr.2



Both liquid and granular fertilizers containing nitrogen, phosphorus, and potassium were applied directly in the seed zone of soybeans (Glycine max (L.) Merrill) at planting. An application of 35.5 liters/ha (3.8 gallons/acre) of a liquid 5.0-8.8-4.2 (N-P-K) “popup” fertilizer reduced stands by 57.8% and yields by 20.3%. Plant stands were reduced when only 11.2 kg/ha (10 lb/acre) of a granular 10-15-5 (N-P-K) “popup” fertilizer was applied in the seed zone at planting.

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