C. Castro et al., CORN RESPONSE TO 2 FERTILIZATION RATES UNDER SW SPAIN CONDITIONS - EFFECT ON THE FE, MN, ZN, CU AND B LEVELS OF THE PLANT, Agrochimica, 39(1), 1995, pp. 1-9
Iron, Mn, Zn, Cu and B contents of corn cv. PRISMA were studied in rel
ation to two fertilizer treatments: the high rate used in irrigated fi
elds in sw Spain (1000 kg/ha of 15-15-15 complex fertilizer and two ap
plications of 400 kg/ha of urea, 46%N) and the same rate reduced to on
e third. In general, the concentration of these micronutrients were al
ways within the limits of the corresponding sufficiency ranges propose
d in the literature for different stages of the crop. According to DRI
S indices, Cu and especially Mn were clearly sufficient for PRISMA cor
n throughout the period of cultivation, Zn being essentially balanced.
Iron and B showed contrasting pattern, B being comparatively low init
ially and essentially adequate at flowering and maturity, and Fe being
quite sufficient initially and comparatively low at flowering and mat
urity.