| Waterlogged disaster is one of the main factors affecting agricultural production.Our agricultural producing countries, endangering the Flooding of agricultural production has been seriously waterlogging stress can lead to stunted crop growth, the impact of crop yield and quality.Yangtze River is China’s main producing rapeseed, canola accounted for over 80% of national production, while the spring is one of the common waterlogged main agricultural meteorological disasters in the Yangtze River region rapeseed growing period, the Yangtze River region in spring often more precipitation stage continuous rain, waterlogging stains formed Lianyin harm.In this paper, ’Zhejiang Commodities Ⅳ’ early maturing varieties of Brassica napus as material, through field experiments conducted on rape growth of key water control tests, moisture control from the rapeseed plant height, dry weight, and other aspects of starting production, research moisture control different time scales affect the growth and yield of oilseed rape to further explore waterlogging stress on agricultural production hazards. Meanwhile, for the study of high quality and efficient cultivation of rapeseed and the Yangtze River to maintain the ecological balance of the sustainable development of agriculture to provide a scientific basis. The results showed that:(1) 2012 and 2013 water control plant height were 9 days compared with the control group decreased by 3.1% and 2.1%; 2012 and 2013 water control plant height at 15 days, respectively, compared with the control group decreased by 3.8% and 3.4%; thus visible prolonged waterlogging stress inhibits the growth of plant height Moisture control handle different time scales relative growth of winter canola flower plant height were also affected. The analysis that, in 2012 with a relatively lower growth rate of plant height T3 treatment in 2013 were significantly lower than CK group, only 1.07% and 0.55%.Description prolonged water stress, can lead to plant height growth slowed, or even stop growing. Height growth analysis T2 group found that moisture control to the first nine days, were significantly lower than CK group, and moisture control to the first 15 days, were significantly higher. This result showed that nine days after the removal of the continuous waterlogging waterlogging stress, plant height growth recover to a certain extent.(2) With the severity of waterlogging stress,2012 T1, T2, T3 group rapeseed plant stem dry weight compared with CK, were reduced by 11.69%,15.57% and 26.52%; pods per plant dry weight were reduced 16.36%,19.33% and 27.69%; rapeseed aboveground dry weight decreased by 13.67%,15.76%,25.6%.Correlation analysis and multiple comparisons that canola pods per plant dry weight decreased, but not sensitive to waterlogging stress, while rapeseed plant stem weight and shoot dry matter weight and different waterlogging time showed a significant negative correlation. Compared with CK, T3 treatment plant under rapeseed plant stem weight, dry weight of pods per plant, plant part dry weight differences were significant ground level.(3) Under Waterlogging Stress,2013 T1, T2, T3 group rapeseed plant stem dry weight compared with CK, were reduced by 9.99%,18.43% and 25.55%; pods per plant dry weight decreased by 12.61%,24.28% and 32.19%; rapeseed aboveground dry weight decreased by 10.86%,20.22%,27.54%.Correlation analysis and multiple comparisons that canola pods per plant dry weight, stem weight per plant and plant aboveground dry weight and different waterlogging time showed a significant negative correlation. Compared with CK T3 group canola plant stems per plant weight, dry weight of pods per plant, plant part dry weight difference on the ground to reach a significant level. Description waterlogging stress will affect the normal rapeseed aboveground dry matter accumulation, with the deepening of waterlogging stress, rape aboveground dry matter accumulation are getting lower and lower.(4) With longer flowering time moisture control, rape maturity, number of pods, grain weight, yield per plant decreased. The test results show that compared with 2012 CK, T1, T2, T3 group canola pods number decreased by 7.09%,18.71%, 22.7619%; canola grain weight decreased by 0.8%,6.65%,12.02%. Compared with CK, under the T1 level of treatment, rape plant yield rose slightly to 0.93% rise, while T2, T3 group rapeseed yield per plant decreased by 12.31% and 17.48%.Correlation analysis and multiple comparisons that, waterlogging showed a different time and the number of rapeseed and canola pods per plant yield significant negative correlation coefficient r=-0.970*, r= 0.963*, different stains water time and grain weight showed a significant negative correlation coefficient of r=-0.991**. T3 treatment, the number of pods, rape grain weight, yield per plant rapeseed differences were highly significant.(5) 2013 test results show that, compared with CK, T1, T2, T3 group canola pods number decreased by 6.28%,19.26%,22.76%; canola grain weight decreased by 1.03%,7.46%,12.34%. Compared with CK, under the T1 level of treatment, rape plant yield rose slightly to 0.73% rise, while T2, T3 group rapeseed yield per plant decreased by 11.74% and 18.47%.Different waterlogging time between the effective pod number per plant rapeseed and canola yield per plant showed a significant negative correlation coefficient r=-0.970*, r=-0.973*; different waterlogging time on the grain weight showed a significant negative correlation correlation coefficient of r=-0.993**, T3 treatment, the number of pods, rape grain weight, yield per plant rapeseed differences were highly significant. This result indicates that with lengthened waterlogging stress time, canola grain weight and yield per plant decline more and more, the canola production is also getting lower and lower, the resulting loss of agricultural production will increase.(6) Different flowering shade under severe waterlogging treatment resulted in canola maturity, number of pods, grain weight, yield per plant reduced to varying degrees. Compared with CK, T1, T2, T3 group canola pods number decreased by 23.63%, 31.20%,43.21%; canola grain weight decreased by 9.51%,20.06%,22.62%; rapeseed yield per plant decreased by 19.2%,35.75%,46.29%.Correlation analysis and multiple comparisons that, under heavy shade showed a significant negative correlation between time and waterlogging number rapeseed and canola pods grain weight, a correlation coefficient of r=-0.971*, r=-0.975*, different waterlogging time and yield per plant showed a significant negative correlation. Compared with CK, Ti, T2, T3 treatment, the number of pods rapeseed, grain weight, yield per plant, the differences were highly significant (P<0.01).Contrast 2013 shade and not shade the results that, Ti, T2, T3 group canola pods increase the number dropped to 16.53%, respectively,11.94%,20.45; rapeseed increased grain weight decreased by 8.47%, 12.60%,10.19%; plant production fell 19.93 percent growth, respectively,19.01%, 28.26%. This result indicates that the shade under waterlogging stress treatments on canola yield indices is more obvious. |
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