Abstract: Artificial microecological conditions for growth of corn seedlings were brought about in an arched plastic shed.Under this condition spring corn can be sown 15 to 20 days earlier,and seeds emerge 20 to 30 days earlier in cool areas.Effective accumulated temperature increases by 100 to 180 οC, with lighting 200 hours longer.Grain filling stage prolongs 10 days.The efficiency of energy use is 1.26 times that of the conventional cultivation method.In transplanted spring corn the plant height is 13 to 35 cm lower and the first ear location height,15 to 32 cm lower.The plant density increases by 10% to 15%.The largest leaf area comes 10 days earlier.The total of photosynthesis increases by about 10%.During the grain filling stage,CGR, RGR,and NAR increases by 88.3%,61%and 93.6%,respectively,while LAR decreases by 16.7%.The roots of transplanted corn develop well and early,and decline slowly.There is a smooth relation between vegetative growth and generative growth.More assimilation products distribute to roots and reproductive organs.It may facilitate the formation of economic yield and the improvement of the economic coefficient.

Key words: Spring corn, Raising and transplantation of seedling, Ecology, Physiology

CLC Number: 

• S513