Effects Of Planting Density On Silique Shattering Resistance Index And Agronomic Traits In Rape

In order to explore the planting density on Brassica napus crack angle index andagronomic traits, this experiment selected three varieties: Zayou158, Qin7, Yu10, and in thethree density gradient (45×104/hm2,60×104/hm2and75×104/hm2) on agronomic traits,photosynthesis, lodging resistance were investigated, tester stalk lignin and crude fibercontents were determined using M6crude fiber, on rapeseed material pod to crack angle indexwas determined by the random collision method, at the same time the subject of60selectedvarieties group field, select a group of high ability of cracking angle varieties.(1) The number of branches of3varieties were45×104/hm2planting densitiessignificantly higher than other two density,10varieties to plant height with increasing densityshowed a significant decline, branch position with plant height decreased with increasedsignificantly,45×104/hm2branches significant high in the other two density level, singleangle with the number density increased and decreased, the formation of significant difference.Zayou158height along with the density increased, in75×104/hm2density and the otherdensity height decreased significantly, branch position in60×104/hm2density reaches themaximum value50.00cm, with other two density are significantly different, the number ofsingle angle significantly reduce Qinyou7, the plant height as the density increases, but thebranch position had no significant effect on the main sequence number, there is no obviouschange in the angle of60×104/hm2density per plant, but decreased with the increase inangular number density significantly.(2) In the photosynthetic rate, Zayou158is more suitable for planting rapeseed varieties,because of its leaves and pods of photosynthetic efficiency were increased along with thedensity increase gradually, Yu10and Qin7in60×104/hm2density reached the highest, afterthe beginning of significantly reduced, indicating that Qin7,Yu10and Qin photosyntheticefficiency in the higher density will be losses.(3) Physical and chemical properties of the stem, the lignin and cellulose content all increased with the density increasing in three varieties, but the decreasing of lignin and lowercellulose content would not lead to plant lodging, it should be that the density changingcaused a series of relevant characters changed in the plant.(4) The crack-resistance of silique, under the planting density of60×104/hm2, the indexof crack-resistance of Yu10was significantly higher, and the thickness of the pericarp and thelength of pedicel of the seed was significantly higher in; Under the planting density75×104/hm2, the crack-resistance index of siliques, the pericarp thickness, the wideness of thesiliques, and the length and amount of seed was significantly higher in Zayou158; Under theplanting density of60×104/hm2, the crack-resistance index of siliques, the pericarp thickness,the wideness of the siliques, and the length and amount of seed was significantly higher inQinyou7. The article thinks, the siliques crack-resistance index has the positive correlationwith pericarp thickness in Brassica napus. Because of the method of the crack-resistancetesting were all different, so we need much more materials to test whether the crack-resistancehas the correlation with the length and pedicel.(5) The production, Yu10has the poor performance of the production under the highplanting density, so it’s not suitable to plant under the high planting density, Zayou158andQinyou7all reached the maximum average yield under the75×104/hm2density, it said thatthe Zayou158and Qin7are suitable to plant under the high planting density.