In order to further tap the potential of dense planting and improve the grain yield of oilseed flax,the split plot experiment was conducted in 2021 to study the effects of increasing density(750×104,850×104 and 950×104 grains/hm2)and expanding width(10 cm)on the photosynthetic characteristics,dry matter accumulation and yield formation of oilseed flax.The results showed that the leaf area index,photosynthetic potential and population growth rate of oilseed flax were significantly increased by 34.52%-38.66%,35.60%-36.23%and 20.17%-21.60%,re-spectively,compared with conventional drilling sowing treatment.And which was the largest under wide-width uniform sowing with 20 cm row spacing.Increasing of the width significantly increased the dry matter accumulation after budding stage and the dry matter distribution ratio of reproductive organs at maturity stage,and the dry matter accumulation increased with the increase of planting density at different row spacing levels.Compared with conventional drilling sowing treatment,wide sowing significantly increased the grain yield of oilseed flax by increasing the number of effective capsules per plant,with an average increase of 13.85%-17.38%.Among them,the highest grain yield has reached 1884.44 kg/hm2,under the treatment of 20 cm row spacing and 950×104 grains/hm2 density.In summary,the combination of wide planting spacing of 20 cm and planting density of 950×104 grains/hm2 can effectively improve the photosynthetic capacity dry matter accumulation and grain yield of oilseed flax in the dry region of northwest.
关键词
胡麻/增密扩幅/光合特性/干物质/产量
Key words
flax/increasing density and width/photosynthetic characteristics/dry matter/yield
万方数据