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Effects of Planting Density on Soil Water Content and Dry Matter Producing Characters for Used Film Reusing in Aridland Oilseed Flax
Pages: 111-120
Year: Issue:  6
Journal: Plant Fiber Sciences in China

Keyword:  planting densityused film reusingoilseed flaxsoil waterdry matter accumulationyield;
Abstract: Field experiments were conducted to investigate effective planting density in field and its mechanism on yield improvement of oil flax in arid areas for used film reusing. It was compared soil water amount,growth character,dry matter accumulation and distribution,water use efficiency and yield under 7 planting density models,such as 3.0(D1),4.5(D2),6.0(D3),7.5(D4),9.0(D5),10.5(D6) and 12.0(D7)million grains per hectare. The results showed that low-planting density had a remarka-ble effects on soil water utilization before flowering stage,dry matter accumulation improvement and water use efficiency promotion of oil flax under one film used twice. Differences of soil water content were mainly reflected at the vegetative period before budding stage under 7 planting density models,and keep-ing essential water from vegetative to reproductive stage. With planting density decreasing,a trend started out from Momi fir stage as dry matter accumulating content increasing under different density treatments in the same stage,and showed the highest in the different growth periods in D1 ,and it increased signifi-cantly by 86.93% to 147.97%between D1 and the lowest treatment at the same stage. Net assimilation ratio and relative growth ratio response to the treatments had the same trend as dry matter accumulation, D1 treatments were higher than the other planting density treatments. Grain weight,leaf weight and stem+spike axis +kernel husk weight were the highest in maturity stage under D1 treatment. Dry matter translocation amount before anthesis indicated a decreasing trend with planting density increasing,which significantly increased by 508.69 kg·hm-2 over D7. An opposite trend appeared in dry matter assimila-tion amount after anthesis,and differences were not significant. The experiment got the highest yield and water use efficiency under D1 treatment,up to 1837.95 kg·hm-2 and 11.71 kg·hm-2·mm-1,in-creased by 27.47% and 30.69% over D7 ,respectively. The study recommended 3.0 -4.5 million grains·hm-2 as the most appropriate density in high-yield for the culture conditions of used film reu-sing. However,the optimal planting density also needed considerations of local physical conditions and tillage measures.
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