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This article in SSSAJ

  1. Vol. 53 No. 1, p. 282-287
    Received: Feb 16, 1988

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Distance and Distribution Effects of Phosphorus Fertilizer on Corn

  1. B. Eghball and
  2. D. H. Sander 
  1. Dep. of Agronomy, 253 Keim Hall, Univ. of Nebraska, Lincoln, NE 68583



Fertilizer P distribution and distance of application from the plant can affect fertilizer P efficiency. Ammonium polyphosphate solution tagged with 32P was injected into Sharpsburg sicl (Typic Argiudoll) 10-cm deep on circle located 16, 32, 48, and 64 cm from five corn seeds (Zea mays L.) planted in the center. The P fertilizer for each plot was divided into 10 equal parts and was injected into 10 spots on the circle's circumference at five different spacings. To study the movement of P in the soil, seven concentrations of P fertilizer were injected into the soil 5-cm deep. Results indicate that after 90 d P fertilizer moves outward from the injected point to form a near perfect sphere whose volume was related in a quadratic manner to the P application rate. At early stages of growth, seed placement of P fertilizer and placement up to 16 cm resulted in greater plant P from fertilizer than other P distances. At maturity little or no effect of P application distance was observed. Plant P from fertilizer increased as the surface area of the fertilizer P-effected soil increased, indicating surface area is an important factor involved in determining the probability of root-fertilizer contact. Plant P from fertilizer increased as the spacing between injection points increased because surface area of the fertilizer P-effected soil was increasing. Plant P from fertilizer decreased with time indicating that a greater proportion of plant P was from soil P late in the growing season.

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