Cm. Correia et al., Ultraviolet-B radiation and nitrogen effects on growth and yield of maize under Mediterranean field conditions, EUR J AGRON, 12(2), 2000, pp. 117-125
The effects of an increase in UV-B radiation on growth and yield of maize (
Zea mays L.) were investigated at four levels of applied nitrogen (0, 100,
200 and 300 kg ha(-1) of N) under Mediterranean field conditions. The exper
iment simulated a 20% stratospheric ozone depletion over Portugal. Enhanced
W-B and N deficiency decreased yield and total biomass production by 22-49
%. High UV-B dose reduced yield, total biomass and growth of N-fertilized m
aize plants but did not affect N-stressed plants to the same extent. The re
sponse of grain yield to N was smaller with enhanced UV-B radiation. The un
derlying mechanisms for these results are discussed. (C) 2000 Elsevier Scie
nce B.V. All rights reserved.