小麦与花生间作改善花生铁营养的效应研究

Improvement of iron nutrition of chlorosis peanut by intercropping with wheat

采用砂-土联合培养根箱试验装置,模拟田间试验研究石灰性土壤小麦与花生间作改善花生Fe营养的效应结果表明,石灰性土壤高pH和高CaCO3是导致花生缺Fe黄化的主要原因。叶片已发生黄化的花生与小麦间作可明显改善花生缺Fe症状,间作16d后花生根际土壤有效铁含量、花生新叶叶绿素和活性Fe含量均显著提高。小麦与花生间作对改善花生Fe营养的效应可能与缺Fe小麦根分泌的Fe载体对土壤中Fe活化有关。

A combined rhizo-box experiment with quartz sand-soil, simulating field observation of improving Fe-deficient chlorosis of peanut （ Arachis hypogaea L. ） by intercropping with wheat （ Triticum aestivum L. ） was conducted under the controlled environmental conditions to examine the effects of peanut wheat intercropping on Fe nutrition of peanut in calcareous soils. The results show that the high pH and high content of CaCO3 are the main reasons for Fe-deficient chlorosis of peanut in calcareous soils, Fe-deficient chlorosis in young leaves of peanuts is obviously improved when chlorosis peanuts is intercropped with wheat. For the peanut intercropped with wheat for 16 days, the concentrations of chlorophyll and active Fe in young leaves and available Fe content in rhizosphere soils are prominently increased compared with monocropping, The results suggest that improvement of Fe nutrition of peanut may be related to the release of phytosiderophores from Fe-deficient wheat roots.