Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 November 1988
Published in Agron J 80:859-864 (1988)
© 1988 American Society of Agronomy
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Interactive Water and Nitrogen Effects on Senescence of Maize. I. Leaf Area Duration, Nitrogen Distribution, and Yield

D. W. Wolfe*

Dep. of Vegetable Crops, Cornell Univ., Ithaca, NY 14853

D. W. Henderson and T. C. Hsiao

Dep. of Land, Air, Water Resources, Univ. of California, Davis

A. Alvino

Istituto Irrigazione CNR, Via Argine 1085, Napoli-Ponticelli, Italy

* Corresponding author

Stress effects on leaf senescence are important for maize (Zea mays L.), since production of new photosynthetic area is genetically pre-determined. Interactive effects of water and N deficits on water potential components, green leaf area (GLA) duration, and N and biomass allocation during grain filling were evaluated in a 2-yr field study conducted on Yolo loam (flne-silty, mixed, nonacid, thermic Typic Xerorthents) under four treatments: 180 kg N/ha applied at planting, with (NI) and without (ND) irrigation; and no N fertilizer, with (OI) and without (OD) irrigation. Leaves of low N plants had reduced capacity for solute accumulation, and both water and N deficits caused 0.1- to 0.5-MPa reductions in midday leaf turgor. Total GLA was smallest in the OD treatment, but senescence during grain filling was greatest in the ND treatment because of a high transpiration demand and a high reproductive sink demand for N. Ear removal reduced the rate of post-anthesis leaf N decline of all treatments, and plants in the ND treatment showed a significant reduction in leaf senescence rate when ears were prevented. Grain yield of the OD treatment was <50% of NI yield in both years; ND and OI treatments had intermediate reductions. Although the timing and intensity of stress differed between treatments and years, both water and N deficits reduced leaf longevity, and GLA duration from anthesis to harvest was linearly related (r2 = 0.92) to final grain dry weight.

Joint contribution of the College of Agric. and Life Sciences, Cornell Univ., and the Univ. of California, Davis. Cornell Vegetable Crops Paper 861.

Received for publication June 23, 1987.


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