02214naa a2200253 a 450000100080000000500110000800800410001910000190006024501020007926000090018152015390019065000100172965000160173965000230175565300210177865300230179965300130182265300170183565300150185270000170186770000120188470000190189677300450191514195041996-01-23       1986    bl ---       0--  u    #d1 aBENNETT, J. M.  aInteractive effects of nitrogen and water stresses on water relations of field-grown corn leaves.  c1986  aWater and N stresses often limit corn (Zea mays L.) grain yields. Although the effects of either water or N stress on crop growth and development, physiology, and yield have been widely studied, relatively little information is available on the interactive effects of these stresses when imposed in combination. The objective of this study was to define and evaluate the interactive effects of water and N stresses on leaf water potential components, transpiration rate, and stomatal resistance of field-grown corn leaves. Corn grown on a Kendrick fine sand soil (loamy, siliceous, hyperthermic Arenic Paleudult) was subjected to two water management treatments (optimal irrigation, and a 10-day water stress period, which immediately preceded 50% silking). Within each water management treatment, two N levels (low, 62kg ha-1; high, 275kg ha-1) were imposed. During the water stress period, both midday and diurnal measurements of leaf water potential, leaf osmotic potential, leaf turgor potential, leaf transpiration, and leaf diffusive resistance were determined on combinations of the water and N stress treatments. Although high-N plants attained similar or slightly lower than low N plants as a result of the water stress, high-N plants maintained lower stomatal resistances at the lower. High-N plants also extracted more water from depths below 0.3m in the soil profile compared with the low-N plants. Lower as declined resulted in higher in high-N plants,which was probably responsible for the lower stomatal resistances ...  aMilho  aNitrogênio  aPotencial Hídrico  aEstresse hidrico  aPotencial osmotico  aStresses  aTranspiracao  aZea mays L1 aJONES, J. W.1 aZUR, B.1 aHAMMOND, L. C.  tAgronomy Journalgv.78, p.273-280, 1986.