[Effects of tillage pattern on the flag leaf senescence and grain yield of winter wheat under dry farming].
A field experiment was conducted to study the effects of different tillage patterns, i.e., deep plowing once, no-tillage, subsoiling, and conventional tillage, on the flag leaf senescence and grain yield of winter wheat, as well as the soil moisture and nutrient status under dry farming. No-tillage and subsoiling increased the SOD and POD activities and the chlorophyll and soluble protein contents, decreased the MDA and O2(-.) contents, and postponed the senescence of flag leaf. Under non-tillage and subsoiling, the moisture content in 0-40 cm soil layer at anthesis and grain-filling stages was decreased by 4.13% and 6.23% and by 5.50% and 9.27%, respectively, and the contents of alkali-hydrolysable N, available P, and available K in this soil layer also increased significantly, compared with those under conventional tillage. Deep plowing once decreased the moisture content and increased the nutrients contents in 0-40 cm soil layer, but the decrement and increment were not significant. The post-anthesis biomass, post-anthesis dry matter translocation rate, and grain yield under no-tillage and subsoiling were 4.34% and 4.76%, 15.56% and 13.51%, and 10.22% and 9.26% higher than those under conventional tillage, respectively. It could be concluded that no-tillage and subsoiling provided better soil conditions for the post-anthesis growth of winter wheat, under which, the flag leaf senescence postponed, post-anthesis dry matter accumulation and translocation accelerated, and grain yield increased significantly, being the feasible tillage practices in dry farming winter wheat areas.
College of Agriculture, Henan University of Science and Technology, Luoyang 471003, Henan, China. huangming_2003@126.com
Ming
M
Huang
Jin-Zhi
JZ
Wu
You-Jun
YJ
Li
Yu-Qing
YQ
Yao
Can-Jun
CJ
Zhang
Dian-Xiong
DX
Cai
Ke
K
Jin
D000383:Agriculture / Q000379:methods*; D018533:Biomass; D002523:Edible Grain / Q000254:growth & development*; D018515:Plant Leaves / Q000502:physiology; D014908:Triticum / Q000254:growth & development* / Q000502:physiology