种植密度对红麻品种中杂红368抗倒伏性能的影响OA

To clarify the lodging resistance of kenaf hybrid H368 that widely planted in the southern of Henan,five density levels were set to systematically study the changes and interactions of stem traits,mechanical properties and lodging rate of kenaf hybrid H368 under different planting densities.The re-sults showed that with the increase of density,the plant height,the height of center of gravity and the to-tal number of stem nodes of kenaf first increase and then decrease.The highest peak was reached at 18×104 plants/hm2.Stem node with the center of gravity,stem diameter,aboveground dry weight,inter-node dry weight,dry weigh per unit length,and ratio of internode diameter to length gradually de-creased;stem internode length gradually increased;the mechanical strength and puncture strength of the stem gradually decreased;the root lodging rate and standing stem rate decreased,but the stem lodging rate and breaking rate increased.The lodging rate was significantly negatively correlated with plant height,center of gravity height,total number of stem nodes,stem node with the center of gravity,punc-ture intensity,aboveground dry weight,internode dry weight,and unit length dry weight,while signifi-cantly positively correlated with stem internode length.Plant height,height of center of gravity,stem di-ameter,internode length,ratio of stem diameter to length and puncture intensity were important indica-tors reflecting kenaf lodging resistance.Especially internode length and stem puncture strength could be used as important reference indicators in breeding and production.The density should be controlled be-tween 18×104-21×104 plants/hm2 to ensure high and stable yield of kenaf in production.