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This article in AJ

  1. Vol. 85 No. 2, p. 290-295
     
    Received: Aug 30, 1991


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doi:10.2134/agronj1993.00021962008500020024x

Comparison of Foliar and Preplant Applied Nitrogen Fertilizer for Sugar Beet

  1. J. A. Lamb  and
  2. J. T. Moraghan
  1. D ep. of Soil Science, Univ. of Minnesota, St. Paul, MN. 55108
    D ep. of Soil Science, North Dakota State Univ., Fargo, ND 58105

Abstract

Abstract

Leaf canopies of sugar beet (Beta vulgaris L.) grown in the Red River Valley of Minnesota and North Dakota sometimes display midseason (July) symptoms of N deficiency. The influence of in-season foliar N applications on sugar beet grown under non-irrigated conditions on a Wheatville loam (coarse silty over clayey, frigid Aeric Calciaquoll) with low and medium levels of soil N fertility was studied for 3 yr. A combination of eight soil and foliar treatments were investigated. The soil treatments were (i) soil NO3 −N in the 0- to 60- cm depth of soil in the previous autumn (45 kg ha−1 in the 1986 and 1987 experiments, and 78 kg ha−1 in the 1988 experiment), and (ii) the above soil NO3 −N levels plus sufficient fall-applied urea-N to give the equivalent of 157 kg N ha−1. In-season foliar-N treatments, using an urea-NH4NO3 solution (28-0.0), were applied in 22 kg N−1 increments on 1 July, 15 July, and 1 August to give total foliar-N treatments of 0, 22, 44, and 66 kg N ha−1 at both levels of soil-N fertility. Overall, the use of foliar N application did not effect root yield and extractable sugar per hectare in 2 of the 3 yr. In one year, 1986, it did increase root yield by 5.2 Mg ha−1 and extractable sugar by 0.9 Mg ha-t under N deficient conditions with no differences occurring under adequate N nutritional levels. There was a significant increase in both root yield and extractable sugar per hectare in 1986 and 1987 as a result of fall applied fertilizer N but not in 1988. If soil moisture conditions are favorable for plant growth such as in 1986, the use of a mid season foliar N application may be beneficial in N deficient situations.

Supported in part by funding from the Sugar Beet Research and Education Board of Minnesota and North Dakota.

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