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Agronomy Journal Abstract -

Quantitative Removal of Major Nutrients by Three Pasture Grasses1

 

This article in AJ

  1. Vol. 64 No. 6, p. 739-743
     
    Received: Jan 23, 1972


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doi:10.2134/agronj1972.00021962006400060009x
  1. Robert W. Duell2 and
  2. J. Richard Trout3

Abstract

Abstract

On the premise that fertilizer needs might be better understood if plant removal were known, the yield of N, P, and K was recorded for 15 harvests of field plots over 3 years. Tall rescue (Festuca arundinacea Schreb.), Kentucky bluegrass (Poa pratensis L.), and orchardgrass (Dactylis glomerata L.) plots were replicated three dines and were split to receive annual applications of A, 224-98-186 (kg/ha of N-P-K) half in spring, half in summer); B, 224-0-0 (scheduled as A); and C, 112-49-93 (spring only).

In individual harvests these grasses frequently differed in yield; percent N, percent P, and weight of N, P, and K removed. Combined analyses (five harvests/year for 3 years) confirmed differences among species in yield and percent N and P; in weight of elements removed by species, however, only the lower quantity of P removed by Kentucky blyuegrass was significantly different, averaging 50% less than the other grasses.

The decrease in K removal from NH4NO3 at 224-0-0 vs 224-98-186 was greater than decreases in removal of N, P, or dry matter. Seasonal and annual decreases in K were consistent.

When element removal was calculated as annual yield ✕ mean percentage of the element rather than the sum of the products of plot yield ✕ plot composition, significantly lower mean values for N and K (4.2 and 5.0% lower, respectively) were obtained. N and K percentages were significantly correlated with DM yields. Phosphorus percentage values did not correlate with DM yields. The discrepancy between the actual weight of P removed (by a grass at a fertilizer treatment in a given year) and the short-cut calculation might be either positive or negative; a comparison between such extreme values would lead to large errors.

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