玉米花生间作对花生铁营养的影响

采用根箱隔网盆栽方法模拟研究了玉米／花生间作对花生吸收利用铁营养的影响。用30m尼龙网将聚氯乙烯制作的根箱分为根室和外室，模拟了玉米单作、花生单作、玉米／花生间作三种情况。结果表明，间作对花生的铁营养状况有很大的影响。当花生与玉米间作时，花生地上部不表现缺铁现象；而花生单作则表现出严重的新叶缺铁黄化现象。间作花生新叶的全铁含量是单作的1．8倍，单作新叶活性铁含量仅是间作的47．2％，叶绿素含量是间作的25．3％。间作显著促进了花生对铁的吸收，使花生不同的部位的含铁量高于单作，从而提高了花生的光合速率；同时间作花生对铁的利用效率明显增加，花生子粒中铁的吸收量是单作的两倍多。

EFFECT OF MAIZE／PEANUT INTERCROPPING ON IRON NUTRITION OF PEANUT

An investigation was carried out to test the effect of maize/peanut intercropping on iron nutrition of peanut. There were three treatments: peanut monocrop. maize monocrop and maize/peanut intercropping. The plants were grown in sandy soil in pots with two compartments separated by 30μ m nylon nets, a central one for root growth and outer ones for soil. The results showed that intercropping improved iron nutrition of peanut. When peanut was intercropped with maize, the peanut had no iron deficiency, but peanut of monocrop treatment showed severe iron chlorosis on young leaves. In monocropping, the active iron content of peanut in young leaves was only 47.47% of that of intercroppng, and chlorophyll content was equal to 25. 28% of that of intercropping. Intercropping increased photosynthetic rate of peanut leaves. For different parts of peanut. the iron content of shoot. root and total plant was more than that of monocropping treatment. The reasons for this may be that maize root exudates released insoluble iron from soil and supplied enough iron to peanut, and some activity of maize root could also affect reducing capacity of peanut, which needs to be studied further.