بررسي مقداتي اثر آللوپاتي و نماتودكشي عصاره سياه تاغ

Preliminary investigation on allelophatic and nematodicid effect of Haloxylon ammodenderon extract

In order to study allelophtic effects Haloxylon ammodenderon extract,an experiment was Contacted in a compeletly randomized desing with factorial combination in three replications. For studying nematodicide effects, an experiment was randomly designed with four treatments and three replications. The Factors taken into consideration for allelopatice effect were the concentration of Haloxylon extract at 4 levels (0,25,50,100%) and two crops species (wheat and alfalfa),and the nematocide effects were investigated at 4 levels (0,10,25,100%). The result of this study showed that the Haloxylon extract has the allelopathic and nematodicid effect. The maximum allelopathic effects was at in the 100% concentration. In this concentration, germination and the length of the shoot was decreased under effect of Haloxylon extract as compared with control condition . In the 50% concentration of Haloxylon extract , except germination all of the attributes were decreased compared with control treatment. In the 25% concentration of extract only length of root was decreased compared with control treatment. In this study , showed wheat and alfalfa have two differnet responses. The alfalfa was more effective than wheat due to allelopathic effect . The results of analysis showed that experiment treatment on living and dead total and also parasite dead saprophyte nematodes was influneced the numbers of dead and living parasite and on 1% level . Althogh these experiments was not influence on living saprophyte nematods . This result also showed that Haloxylon extract at 25% concentration in addition could be killed about 64% parasite nematodes. While has had a little effect on free and saprophyte nematodes , the nematodicid poison could be killed total of the nematodes in the soil contain parasites and saprophyte nematodes. On the other hand 25% concentration of Haloxylon extract has minimum in hibitatory on charactristics growth of alfalfa and wheat.