Soybean root growth as influenced by seed treatment with molybdenum under net and relay strip intercropping system.

摘要

For a better understanding of soybean root growth as influenced by seed treatment with molybdenum (Mo), we examined some root growth morphological characteristics of different concentrations Mo (B₀-Control, 0 g/kg, B₁-0.5 g/kg, B₂-1.0 g/kg, B₃-2.0 g/kg and B₄-4.0 g/kg) treated seeds on the growth of soybean under net and relay strip intercropping system. The results showed that the taproot length, number of first order lateral roots, root volume, root-nodule fresh weight, number of root-nodules and root dry weight were increased by Mo treated after blooming. Moreover, 2.0 g/kg Mo treatment increased root growth morphological characteristics (except the taproot length) most strikingly in net cropping system, while 1.0 g/kg Mo treatment increased root growth morphological characteristics most significantly in relay strip intercropping system. It could be found that the taproot length in relay strip intercropping system was the most strikingly higher than that in net cropping system, while the first order lateral root number, root volume, root-nodules fresh weight and the number of root-nodule of net cropping soybean were most markedly higher than those of relay strip intercropping soybean at R₂ stage. The results also showed that seed treatment with Mo at a suitable concentration could delay root senescence, and it was more sensitive to Mo treatment of relay strip intercropping soybean, lower concentration could achieve the effect of delaying root senescence.