小麦与花生间作改善花生铁营养的效应研究

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。

Improvement of iron nutrition of chlorosis peanut by intercropping with wheat

A combined rhizobox experiment with quartz sand-soil,simulating field observation of improving Fe-deficient(chlorosis) of peanut(Arachis hypogaeaL.) 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 CaCO_3 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.