Studies On Yield Components And Relationships Between Yield And Its Components In The Super-high-yield Winter Wheat

In this test, 6 super wheat veriaties,being from the super wheat breeding groups of Shandong province, were classified into three types.01-35 and 8355 belonged to big-spike type, 6200(8) and 4133-2 belonged to medium-spike type, and 988044 and 02-48 was poly-spike type. The yields of every matural were over 650Kg/666.7m~2 in this test. Under the condition of different seedtime and planting density. It was studied by the numbers of the contributions of all yield components to yield and trents of colony developments. The yield components included ear number, grain number per ear and weight of 1000 grains. The results were as follows:1.Effects on the yields of different seedtime was different about 6 super wheat cultivars. On the condition of different seedtime, it appeared greatly significant level (P<0.01) to yield of cultivars 02-48, 988044, and 01-35; and it appeared significant level(P<0.05) of cultivars 8355, 6200 and 4133-2. Yields show that: 988044>02-48>01-35>8355>4133-2>6200. It was the best seedtime that on 5 Oct. of seeding date for getting high yields. With the delaying of seedtime, the yields fo all cultivars decreased little by little. However, the effects on yield of planting density to yield did not appeare significant level (P<0.05), the yeild components too. affect the yields and . Above showed, it was necesarry for obtaining high yield that the poly-spike types cultivars and its suitable early seedtime, which was the key factor of super wheat producation for high yield.2.Path-coefficient analysis showed that yield components affected yield directly or indirectly. The trends of effects for yield components on yields respectively showed that, 01-35 appeared ears number per 666.7 m~2>kernels number per ear>weight of 1000 kernels; 8355 appeared kernels number per ear>weight of 1000 kernel > ears number per 666.7 m~2; 6200 appeared kernels number per ear>weight of 1000 kernels > ears number per 666.7 m~2 ; 4133-2 appeared weight of 1000 kernels > ears number per 666.7 m~2> kernel number per ear; 988044 appeared ears number per 666.7 m~2>weight of 1000 kernels >...