The growth developmental characteristics of late and early maturing winter wheat varieties in Huang-Huai-Hai Plain

The comparing experiment between early maturing winter wheat variety “8901-1l-14” and the variety ofTriticum aestivum L．(Heixiaomai No．1)，as well as the local planting variety“4185”，was conducted in Huang-Huai-Hal Plain during the winter wheat growing season from October of 1999 to June of 2000．The results show that Triticum Testivum aestivum L (Heixiaomai No．1)is not a suitable species for the area，while“8901-11-14”is the ideal species for its better ecological fitness concerning with its growth and developmental characteristics in the whole and the key developing time．The results suggest that the relative lesser sowing density can contribute to more harvestable spikes．