maize, yield improvement, planting density, split fertilization, Drip irrigation
Spring maize, Grain yield, Cultivars, Yield variational factors, Northwest China
Drip-irrigated maize, Planting density, Nitrogen fertilizer, Source-sink relationship, Yield
planting density, Maize quality, Protein test weight, Starch test weight, Pricing model, economic benefits
maize, grain yield potential, Lodging resistance, plant morphology, mechanical strength