播种行距和灌水量对紫花苜蓿种子产量及其构成因素的影响

研究了播种行距和灌水量对甘农3号紫花苜蓿种子产量及其构成因素的影响。通过2年研究,得出以下结论,1)随着行距增大,株高下降,株高和种子产量呈负相关,R=-0.802*。2)行距和灌水量对种子产量及产量构成因素的影响不同。行距对种子产量、有效分枝数/m2、花序数/枝条、豆荚数/花序和籽粒数/豆荚的影响较大;灌水量对种子产量及其构成要素的影响均较小。3)种子产量构成因素中,豆荚数/花序(x3)与种子产量极显著正相关,R2=0.882**;籽粒数/豆荚(x4)、花序数/枝条(x2)与种子产量显著正相关,相关系数分别为0.803*和0.693*。种子产量的回归方程为:y=260.358 64.152x3 50.976x4 5.482x2。4)播种当年和生长第2年,行距为100cm、灌水量为900 m3/hm2时,有效分枝数/m2、花序数/枝条、豆荚数/花序、籽粒数/豆荚和种子产量均为最高。2年间的种子产量呈显著正相关,R2=0.801*,回归方程为:y=772.563 0.521 5x 0.009 8x2-2.0×10-5x3。

Influence of row spacing and irrigation rate on seed yield of Medicago sativa

Aftre two years research on the influence of row spacing and irrigation rate on seed yield components and seed yield of Medicago sativa cv.Gannong No.3 the following conclusions were drawn: 1) As row spacing increased,height gradually decreased.At different row spacings,height was negatively correlated(R2=-0.802*) with seed yield.2) The influences of row spacing and irrigation rate on seed yield components and seed yield of M.sativa cv.Gannong No.3 were different.Row spacing had a bigger effect on seed yield,reproductive shoots/m2,florets/shoot,pods/floret and seeds/pod,but irrigation rate had a smaller effect on the above factors.3) Of the seed yield components,pods/floret(x3) and seed yield(y) were positively correlated(P<0.01,R2=0.882**) seeds/pod(x4),florets/shoot(x2) and seed yield were positively correlated(P<0.05) with correlation coefficients of 0.803* and 0.693* respectively.The regression equation was y=260.358 64.152x3 50.976x4 5.482x2.In both planting and second growth years,the highest seed yield was reached when row spacing was 100 cm and irrigation rate was 900 m3/hm2.Seed yield between two years was positively correlated(P<0.05,R2=0.801*) with a regression equation of y=977.177-0.7457x 0.0037x2.