DOI: 10.3724/SP.J.1006.2016.01530

Acta Agronomica Sinica (作物学报) 2016/42:10 PP.1530-1540

Artificial Warming from Late Winter to Early Spring by Phased Plastic Mulching Increases Grain Yield of Winter Wheat

Low temperature from late winter to early spring is a main restraint to high yield in winter wheat production in the northern part of North China Plain. We attempted to artificially increase the temperature during this period through phased plastic film mulching. A field experiment was carried out in the 2012-2013 and 2013-2014 growing seasons with several treatments differing from artificial warming period. Compared with the normal condition (control), mulching since January 25 or February 1 resulted in 167.7-176.8°C increment of accumulated temperature from late January to early March, and mulching one week ear-lier contributed to higher accumulated temperature by 23.0-49.7°C. Wheat seedlings under artificial warming showed earlier re-vival and growth than the control. And the subsequent growth stages were prolonged for 4-10 days because of the relative lower temperature after the plastic film was removed. The earliest warming treatment was most favorable to dry matter accumulation, translocation, and yield enhancement among all treatments. Compared with the control, the earliest warming treatment with mulching increased the dry matter weight and leaf area index at anthesis stage by 18.8% and 14.7%, respectively; as well as pro-longed active photosynthetic duration by more than 10 days, and increased leaf area duration by 43.6%, spike number per hectare by 0.48-0.98 million, kernel number per spike by 3.9-4.5 kernels, and thousand-kernel weight by 2.5-5.6 g. The final yields of the earliest warming treatment were 37.5% and 18.9% higher than those of the control in the cool 2012-2013 and the warm 2013-2014 growing season, respectively, and the maturity date was five days earlier than that of control in the 2013-2014 grow-ing season. Our results indicate that artificial warming by phased mulching with plastic film is an applicable technique in wheat production in North China Plain.

Key words:Late-winter and early-spring,Artificial warming by phased plastic mulching,Winter wheat,Yield,Northern part of the North China Plain

ReleaseDate:2017-01-12 13:30:54

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