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DRYLAND CROPPING SYSTEMS

Hybrid and Nitrogen Influence on Pearl Millet Production in Nebraska

Yield, Growth, and Nitrogen Uptake, and Nitrogen Use Efficiency

^a Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583-0915 USA

smason1{at}unl.edu

Pearl millet [Pennisetum glaucum (L.) R. Br.] is a staple grain crop in the arid and semiarid regions of Africa and India, and a new grain crop in the USA. A 2-year field experiment was conducted near Mead, NE, in 1995 and 1996 on a Sharpsburg silty clay loam (fine, smectitic, mesic Typic Argiudoll) soil with approximately 29 g kg^-1 organic matter, 35 kg ha^-1 NO₃–N, and pH of 6.0. The objective was to determine the influence of hybrid and N on grain yield, dry matter accumulation and partitioning, and growth rates throughout the growing season. Nitrogen concentrations, uptake, and use efficiency were also determined. Treatments were a factorial combination of the pearl millet dwarf hybrids (59022A x 89-0083, 1011A x 086R, and 1361M x 6Rm) and N levels (0 and 78 kg ha^-1) in a randomized complete block design. Two plants per plot were sampled at 2-wk intervals and partitioned into plant parts, dried, weighed, and analyzed for N concentration. Applied N increased grain yield by 0.4 to 0.5 Mg ha^-1, but had only a small effect on dry matter accumulation and partitioning. Hybrid differences were small for grain yield. Pearl millet dry matter accumulation increased cubically in both years, with maximum crop growth rates among hybrids ranging from 0.48 to 0.57 g m^-2 per growing degree day (GDD) in 1995 and ranging from 1.9 to 3.1 g m^-2 GDD^-1 maximum in 1996. The relative growth rate among hybrids declined from 0.012 to 0.020 g^-1 m^-2 GDD^-1 in both years to near zero at physiological maturity. Nitrogen concentrations were higher during the vegetative stages and decreased with plant age. Applied N decreased N use efficiency for aboveground biomass (NUE₁) by 18 to 25 g DM g^-1 N, and N use efficiency for grain (NUE₂) by 7 to 12 g grain g^-1 N. Environmental variability due to years had a greater effect on yield, growth, and N levels than hybrid and applied N.

Abbreviations: GDD, growing degree day • CGR, instantaneous crop growth rate • RGR, instantaneous relative growth rate • NUE₁, aboveground biomass nitrogen use efficiency • NUE₂, grain nitrogen use efficiency

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