土壤施Mn深度对不同基因型小麦缺Mn的影响

以缺Mn土壤为基质进行的小麦模拟土柱试验结果表明,不同施Mn深度条件下3317和川麦222个小麦基因型的缺Mn症、产量、根系分布和体内Mn含量均存在着显着差异。随着施Mn深度的增加,Mn肥的增产效果更为明显,川麦22施Mn的增产幅度高于3317.初步认为,3317耐缺Mn能力高于川麦22,与其根系在中下部土层分布比例高,吸Mn能力强有关。土柱试验发现小麦苗期的缺Mn症在中下部土层供Mn时明显恢复,表明中后期供Mn对小麦产量的形成有至关重要的作用.

Effect of Mn application depth on Mn deficiency of two wheat genotypes

Simulated Mn deficient soil column studies with wheat show that the Mn deficient symptom, grain yield, root system distribution and Mn content of two genotypes (Chuanmai 22 and genotype 3317) were greatly affected by Mn application depth. The yields of both genotypes were obviously increased with the application depth of Mn fertilizer, and the increment of Chuanmai 22 was higher than genotype 3317. It was suggested that the higher tolerance to Mn deficiency of genotype 3317 than Chuanmai 22 was related to the higher percentage of its roots distributing in the middle and lower soil layers and to the stronger capacity of absorbing Mn from soil. It was also found that the Mn deficient symptoms of wheat at seedling stage could be disappeared after Mn fertilizer was applied at mid late stage in the middle and lower soil layers, indicating that applying Mn fertilizer at mid late stage played an important role to the formation of wheat yields.