[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.
Huang
Ming
M
College of Agriculture, Henan University of Science and Technology, Luoyang 471003, Henan, China. huangming_2003@126.com
Wu
Jin-Zhi
JZ
Li
You-Jun
YJ
Yao
Yu-Qing
YQ
Zhang
Can-Jun
CJ
Cai
Dian-Xiong
DX
Jin
Ke
K
D000383:Agriculture / Q000379:methods*; D018533:Biomass; D002523:Edible Grain / Q000254:growth & development*; D018515:Plant Leaves / Q000502:physiology; D014908:Triticum / Q000254:growth & development* / Q000502:physiology