Reciprocity Of Iron And Nitrongen And Its Mycorthizal Effect In The Maize/Peanut Intercropping System

The iron nutrition of peanut is improved by maize in the maize/peanut intercropping system, which enhances the activity of peanut nodule nitrogen fixation. Arbuscular mycorrhizal may form hyphae bridge between different plant roots, which is advantageous to the material exchange. To explore whether is there iron nitrogen reciprocity of interspecific rhizosphere, and arbuscular mycorrhizal whether can promote the maize and peanut on iron, nitrogen absorption in the maize/peanut intercroping system. Under the condition of chemical regulation and phosphate fertilizer, this experiment was under maize intercropping peanut in 2:4 to investigate the influence on iron and nitrogen content, accumulation and distribution and intercropped advantages of maize/peanut intercropping system. Which is of great significance to enhance the intercropped advantage of maize/peanut intercropping system. At the same time, the study also discussed the effect of mycorrhizal of maize peanut interspecific interaction between iron and nitrogen nutrition. The results showed that:The intercropped advantage of the maize/peanut intercropping system was 1656 kg hm-2~3426 kg hm-2, chemical regulation decreased the yield of intercropped maize, while increased the yield of intercropped peanut obviously. The intercropped advantage was 2038 kg hm-2~2551 kg hm-2, compared with no chemical regulation was increased by 5.74%~23.11%. P fertilization enhanced the LAI, photosynthetic matter accumulation of intercropped chemical maize and peanut. The yield of intercropped chemical maize and peanut was increased 12.49%~14.47% and 1.82%~9.75%, respectively. The land equivalent ratio of the maize/peanut intercropping system was higher than one, the intercropped advantage was 2377 kg hm-2~2794 kg hm-2, was increased by 9.52%~16.63% compared with the low phosphorus. In sum, chemical regulation improved the yield of intercropped peanut obviously, and phosphate fertilizer enhanced the yield and the land equivalent ratio of the chemical regulation maize/peanut intercropping system.Maize/peanut intercropping increased the different organs of Fe content of intercropped maize and peanut compared with sole cropping. The Fe uptake of maize/peanut intercropping system was significantly higher than that of sole cropping maize and peanut, it was 29.94%~58.16% and 11.79%~57.22%, respectively. During maize little bell stage, spraying chemical regulation decreased the different organs of Fe content of intercropped maize, while increased the different organs of Fe content of intercropped peanut obviously. After spraying chemical regulation of maize/peanut intercropping system, the Fe intercropped advantage was 3.01 kg Fe·hm-2~4.12 kg Fe·hm-2, was decreased by 0.67%~15.14% compared with the no chemical regulation. Application of P fertilizer enhanced the different organs of Fe content of intercropped maize, but decreased the different organs of Fe content of intercropped peanut obviously. It promoted the Fe uptake of maize/peanut intercropping system. The intercropped advantage of Fe was increased by 8.16%~9.94% compared with the low phosphorus. It suggested that intercropping increased the Fe uptake of maize/peanut intercropping system, displaying a significant Fe intercropped advantage. Chemical regulation and application of P fertilizer were conducive to the promotion of the Fe uptake and the Fe intercropped advantages of maize/peanut intercropping system.Maize/peanut intercropping was beneficial to improve the N content in different organs of intercropped maize and peanut compared with sole cropping. The N absorption of maize/peanut intercropping system was significantly higher that that of single cropped maize and peanut, the N intercropped advantage was 26.88 kg N·hm-2~42.21 kg N·hm-2. The N content in different organs of intercropped maize plant was not beneficial to be improved, while the N content of intercropped peanut plant were beneficial to be improved obviously. The N intercropped advantage of maize/peanut intercropping system was improved by 4.95%~54.65% than those of no chemical regulation. After chemical regulation, application of P fertilizer increased the N content in different organs of intercropped maize and peanut plant, which promoted N absorption of the maize-peanut intercropping system, the N intercropped advantage was 61.89 kg N·hm-2~63.98 kg N·hm-2, were significantly higher than those of without application of P fertilizer by 69.97%~162.57%. It suggested that maize/peanut intercropping improved the N absorption obviously, the chemical regulation and P fertilizer can promote N absorption of maize/peanut intercropping system and increased N intercropped advantage to realize the efficient utilization of nitrogen.Intercropping obviously increased the Fe and N uptake of maize/peanut intercropping system, it was higher than that of sole cropping maize and peanut. After spraying chemical regulation of maize/peanut intercropping system, the Fe absorbtion of maize/peanut intercropping system was decreased, while the N absorbtion was increased obviously compared with the no chemical regulation. Application of P fertilizer promoted the Fe and N uptake of chemical regulation maize/peanut intercropping system compared with the low phosphorus. There was a positive correlation in maize/peanut intercropping, it suggested that the intercropping increased the Fe and N uptake of maize/peanut intercropping system, there was obvious reciprocity of iron and nitrogen of the interspecific rhizosphere in maize/peanut intercropping system. Chemical regulation and application of P fertilizer were conducive to the promotion of the exchange and absorption of iron and nitrogen of maize/peanut intercropping system.Compared with eliminating the interspecific rhizosphere competition between maize and peanut, interspecific rhizosphere effect significantly increased the iron content of peanuts and the nitrogen concentration of maizes. Inoculation of AMF significantly increased iron and nitrogen concentration of peanut and maize, which illustrated that mycorrhizal effect could promote the exchange and absorption of the iron and nitrogen. Interspecific rhizosphere effect and the mycorrhizal effects could increase the uptake of iron and nitrogen of the peanut, maize and the system, the effects was the best in the treatment of that eliminated the interspecific rhizosphere competition and with AMF inoculation at the same time, respectively increased by 102.9% and 90.6%, 182.9% and 83.0%, 151.5% and 84.2% than that of the treatment without interspecific rhizosphere effect and the mycorrhizal effect of the samples on 38 days after emergence. This experiment illustrated that there was obvious reciprocity of iron and nitrogen of the interspecific rhizosphere in maize/peanut intercropping system, the mycorrhizal effect could further promote the exchange and absorption of iron and nitrogen.