Study On The Allelopathy Of Decomposed Plant Residues And Root Exudates Of Processing Tomato

The paper studies on the allelopathy of decomposed plant residues and root exudates of processing tomato. It analyses that the allelopathy influence on the growth of processing tomato from the germination index, growth index and physiology index in order to be better understanding the allelopathy of processing tomato, and revealing the reason of continuous cropping barrier. The paper wants to provide theoretical basis for continuous cropping barrier, and offer technical support for sustainable development of processing tomato industry of Xinjiang.1. With mashed processing tomato leaves, stems and roots as test material, this paper studies the effect of decomposition liquid of processing tomato plant residues on its germination in different decomposition concentration and decomposition time. The results showed that, in different decomposition concentration and decomposition time, the decomposition liquid of processing tomato leaves, stems and roots inhibit processing tomato germination, and as decomposition concentration increasing, the germination energy generally decreasing. The effect is not obvious to germination rate. General view, when the concentration of decomposition liquid of processing tomato plant residues is 6:100 and decomposition time is four weeks, the decomposition liquid of leaves and stems inhibit significantly hypocotyl growth. However, in other decomposition concentration and decomposition time, the decomposition liquid of leaves, stems and roots promotes hypocotyl growth. The decomposition liquid of leaves, stems and roots inhibits radicle growth, when the concentration of decomposition liquid of leaves and stems is 1:100 and the concentration of decomposition liquid of roots is 1:300, the inhibition is the weakest for radicle growth.2. With decomposed processing tomato roots, stems and leaves as test material, this paper studies its allelopathy on the growth of processing tomato. According to the ratio of plants dry weight and idyllic soil weight respectively being 3:100, 5:100 and 7:100, the pot experiment was conducted. The results showed that the seedling growth, root vigor, SOD and CAT activities of processing tomato plants were decreased, while the root MDA content and leaf relative conductivity were increased with the increasing concent ration of decomposed processing tomato roots, stems and leaves. In general, the intensity of inhibitory effect of decomposed processing tomato plant residues to processing tomato seedling growth is: root residues>stem residues>leaf residues.3. In this paper, a solution culture experiment was carried out to study the allelopathy of root exudates of the processing tomato plants. The results show that the germination energy, radical growth, dry weight and wet weight of plants, the photosynthesis, SOD activity of leaves are inhibited by the allelochemicals of processing tomato root exudates, and the inhibitory effect enhanced as the treatment concentration increased. Allelochemicals of processing tomato root exudates are promotive effect to the conductivity of leaves and hypocotyl growth, and the promotive effect is enhanced as the treatment concentration increased. The germination percentage is not influenced obviously by these allelochemicals.4. General view, the results show that the allelopathy of decomposed plant residues and root exudates of processing tomato are harm to germination, seedling growth and physiological function for processing tomato. As a result, when plant processing tomato, a reasonable rotation or intercropping and cleaning up timely the deciduous, deadwoods and residual roots could weaken or removal the allelopathy of processing tomato, and could also have positive effect for enhancing processing tomato yield and reducing its continuous cropping barrier in some extent.