Abstract: To determine the appropriate sowing date of high-yielding cultivation in Yuncheng Area of Shanxi Province, the experiment was conducted in the wheat growing season of 2013-2015 under two tillage subsoiling (SS)and traditional tillage (CK), and September 20 (early sowing date, D₁), October 1 (conventional sowing date, D₂), October 10 (late sowing date, D₃)three sowing date study the effects of SS on the water changes of soil and contribution of dry matter accumulation and remobilization to yield and the adjusting effects of sowing dates. The results showed that the soil water storage was increased under SS in fallow period at different growth stages. Adoption of SS obviously improved dry matter weight, dry matter accumulation and at different growth stages, yield. In fallow period, the soil water storage was the highest under D₂ treatment between winter to booting stage and the lowest under D₁ treatment; the soil water storage was the lowest after anthesis under D₂ treatment. D₂ treatment could significantly increase the dry matter accumulation and accumulation rate in each stage. The yields were significantly increased by 5%-10% under D₂ treatment under the condition of subsoiling during the fallow period. Under the control conditions, the D₂ treatment significantly increased the yield by 9% to 11%. The dry matter accumulation in different organs at anthesis stage showed stem > leaf > ear. The formation of yield was more closely related to the dry matter accumulation after anthesis. The leaf and stems + sheaths dry matter accumulation showed a linearly relationship with the yield and it was positively correlated. The accumulation of dry matter in the glume + spike was parabolic with yield. The dry matter accumulation of ears was significantly parabolic correlated with the yield. In short, subsoiling during the fallow period plus the sowing date of October 1 was beneficial to promote that storage of soil water moisture and increasing dry matter accumulation and translocation, thereby increasing the yield of wheat.

Key words: Subsoiling during fallow period, Sowing date, Dry matter accumulation, Yield

CLC Number: 

• S512.01