Distribution,Yield Structure,and Key Cultural Techniques of Maize Super-high Yield Plots in Recent Years

Maize high-yield potential and small-area super-high yield researches were conducted in different areas in 2006-2010.The geographical distribution,yield components,and key cultivation techniques of 159 maize super-high yield plots with yield higher than 15 000 kg ha 1 were analyzed.Most high-yield plots were distributed in high latitude(40°-43°N) and high elevation regions(1000-1500 m) with abundant sunlight and high temperature in daytime and low temperature during night.These condi-tions were primary factors for super-high yield of maize.The cultivars with super-high yields had the average yield of 16 692 kg ha 1 with 88 950 ears ha 1,541 kernels per ear,1000-kernel weight of 360.0 g,and ear weight of 191.8 g.According to the result of path analysis,the ear and kernel numbers were significantly correlated with kernel yield.The key techniques for maize high-yielding cultivation included selection of cultivars with tolerance to high density,reasonable dense planting,abundant sup-plies of water and fertilizer,proper filed management,and film mulching.