Study on Close Planting of Maize

The result of field experiment which 4 leaf straight-up type maize hybrids, 3 planting model (50cm row distance, 6-angle shape, 67cm row distance), 3 density (60000 plants/hm~2, 75000 plants/hm~2, 90000 plants/hm~2) indicated: the yield of maize was increasing with the increasing density of maize, the difference of maize yield increase by distinct plant-row conducted was big and yield increase percent of 50 cm row was biggest under high density,the maize yield difference from different plant-row distance conduced was not apparent under the lower and middle density, it was only apparent under high density (75000～90000 plants/hm~2, maximum limited density and the above this density); 50cm row distance, 6-angle shape planting, this two planting methods posses yield increase effect which results in single plant nutrition improvement comprise with 67cm row distance under high density. The L.A.I. of 6-single shape sowing at the time of maize flourishing flower was bigger than 50cm and 67cm row distance sowing, but showing no yield increase and decrease difference comprise with 67cm row distance sowing; at the same time to water and apply fertilizer was not convenient at the growing of maize; the minimum combination of Row × Density × Variety was that take the V2 (89-1w×5022),V4(Zhengdan 958) these two type hybrids, 50 cm row distance, 90000 plants/hm~2;not only the maize yield by 50cm row distance sowing was higher 21.4% and 31.2% significantly than 67cm row distance sowing under 75000 plants/hm~2,90000 plants/hm~2 respectively, but also be good for the cultivating of maize. Using the leaf straight-up type maize hybrids and 50cm line distance row sowing evenly ,make the maize mass density up to 75000 ~90000plants/hm~2 , standardization cultivating under no stress of soil water and nutrition ,these compose the technology system of set up the photosynthesis system of high photosynthetic efficiency maize mass canopy. It be provided with important effect of increase maize yield and economical effects in modern maize yield potential developing successively.