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Population Density and Low Nitrogen Affects Yield-Associated Traits in Tropical Maize

^a ENSA Montpellier, France and CIMMYT Maize Program, P.O. Box 6-641, 06600 Mexico D.F., Mexico
^b Indian Agricultural Research Inst., New Delhi, 110 012, India
^c CIMMYT Maize Program, P.O. Box 6-641, 06600 Mexico D.F., Mexico

View larger version (15K): [in this window] [in a new window]   Fig. 1. Relationship between ear/tassel weight ratio and grain yield within tropical maize OPVs, inbred lines, and hybrids under low N conditions.

View larger version (15K): [in this window] [in a new window]   Fig. 2. Relationship between tassel/total aboveground biomass weight ratio and grain yield within tropical maize OPVs, inbred lines, and hybrids under low N conditions.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Relationship between number of green leaves below the primary ear and grain yield within tropical maize OPVs and hybrids under low N conditions, 6 and 8 wk after male flowering.

View larger version (15K): [in this window] [in a new window]   Fig. 4. Evolution of grain number after female flowering within tropical maize OPVs, inbred lines, and hybrids under optimal, high plant population density, low N, and drought conditions. Bars are standard deviation of mean; the horizontal dotted lines indicate for each type of germplasm the potential grain number (ovule number under optimal condition).

View larger version (16K): [in this window] [in a new window]   Fig. 5. Evolution of ear dry weight after female flowering within OPVs, inbred lines, and hybrids under optimal, high plant population density, low N, and drought conditions. Bars are standard deviation of mean; M = maturity; EGR = ear growth rate in g ear–1 d–1.

View larger version (17K): [in this window] [in a new window]   Fig. 6. Evolution of grain dry weight after female flowering within OPVs, inbred lines, and hybrids under optimal, high plant population density, low N, and drought conditions. Bars are standard deviation of mean; M = physiological maturity; GGR = grain growth rate in g kernel–1 d–1.