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Pearl Millet-Soybean Rotation and Nitrogen Fertilizer Effects on Millet Productivity

Dep. of Agronomy, 102B KCR, University of Nebraska, Lincoln NE6 8583-0817

^* Corresponding author

Pearl Millet [Pennisetum glaucum (L.) R. Br.] plays an important role as a staple food grain in many developing countries, but is relatively new to the Great Plains of the USA. This study was conducted for 2 yr to evaluate the effects of a preceding soybean [Glycine max(L.) Merr.] crop and/or applied N fertilizer on pearl millet yield and N uptake and to quantify the amount of residual soil NO₃N resulting from the cropping system. The experiment was conducted on a fine montmorillonitic mesic, Typic Argiudoll soil at the University of Nebraska Research Center near Mead, NE. The experiment included three treatments consisting of 0, 45, and 90 kg N ha^–1 applied to continuous pearl millet, and two treatments consisting of 0 and 45 kg N h^–1 applied to pearl millet following soybean. Pearl millet grain yield was 5.69 (1986) and 4.22 (1987) Mg^–1 with no applied N, 6.42 (1986) and 5.82 (1987) Mg^–1 with 45kg ha^–1 applied N, and 7.13 (1986) and 6.85 (1987) Mg^–1 with 90kg ha^–1 applied N. Grian yields increased 0.73 (1986) and 1.48 (1987) Mg ^–1 when grown after soybeans, yield increase equivalent to that with 45 kg ha^–1 of applied N. Percent N in various plant parts and N uptake increased with applied N or when pearl millet followed soybean Differences in pearl millet plant weight, leaf weight, and LAI did not occury until 62 d after sowing in plots with applied N , but an increase in these parameters due to rotation occurred at 37 d. Residua NO₃ in the soil profile was higher in the rotation treatment than the applied N treatments, but there was a tendency for more residualN O3-N to Occur with increased applied N in the continuous pearl millet. Pearl millet can be successfully used in croppins systems with soybean wth no additional N, but addition of N may be necessary with continuous cropping.

Received for publication July 13, 1992.

This article has been cited by other articles:

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